timmins and matheson area: gravity survey of …...chart a (back pocket) 3—profile l—munro mine...

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irOntario

Division of Mines

HONOURABLE LEO BERNIER, Minister of Natural Resources

Dr. J. K. REYNOLDS, Deputy Minister of Natural ResourcesG. A. Jewett, Executive Director, Division of Mines E. G. Pye, Director, Geological Branch

Gravity Surveyof

Geological Structuresin the

Timmins and Matheson Area

Districts of Cochrane, Timiskaming, and Sudbury

By

R. S. Middleton

Geoscience Report 135

TORONTO

1976

© ODM 1974

Publications of the Ontario Division of Minesand price list

are obtainable through theOntario Ministry of Natural Resources, Map Unit, Public Service Centre,

Parliament Buildings, Queen's Park, Toronto, Ontario.

Orders for publications should be accompanied by cheque, or money order, payable to Treasurer of Ontario.

Parts of this publication may be quoted if credit is given to the Ontario Division of Mines. It is recommended that reference to this report be made in the following form:

Middleton, R.S.1976: Gravity Survey of Geological Structures in the Timmins and Matheson Area, District

of Cochrane, Timiskaming and Sudbury; Ontario Div. Mines, GR135, 45p. Accom panied by Maps 2321 and 2322, scale l inch to 4 miles (1:253,440).

Car—1000—75

CONTENTS

PAGE

Abstract .......................................................................... .vIntroduction ........................................................................ l

Previous Geophysical and Geological Work ..................................... .2Acknowledgments ........................................................... .2

Gravity Survey .................................................................... .3Survey Method ................................................................... 3Corrections to Field Readings ...................................................... 6

Drift Correction and Scale Constant .............................................. 6Theoretical Gravity Correction ................................................... 6Elevation Correction Bouguer and Free Air Correction ............................ .7Instrument Height Correction .................................................... 7Terrain Correction .............................................................. 8Earth Tide Correction .......................................................... .8

Specific Gravity of Rocks .......................................................... 8Interpretation ................................................................... 10

Regional Gravity Interpretation .................................................. 10Felsic Intrusive Rocks ........................................................ 10Metavolcanic Zones .......................................................... 11iMetasedimentary Zones ...................................................... 12Faulting ................................................................... .13

Profile Descriptions ............................................................ 14Profile l Munro Mine to Holtyre ............................................ 14Profile 2 Carr-Beatty Township Boundary .................................... 16Profile 3-Carr Township Lot 2-3 Boundary ................................... 17Profile 4 Carr Township Lot 4-5 Boundary ................................... 17Profile 5-Highway 11-101 Junction to Monteith .............................. 18Profile 6-Highway 577, Shillington to Highway 11 ............................ 19Profile 7 Highway 67, Barbers Bay to Macklem Township ..................... 19Profile 8-Highway 575, Nighthawk Lake Peninsula ........................... .20Profile 9-Ice Chest Lake Road1 ............................................. .21Profile 10-Deloro Township to Wark Township ............................... .22Profile 11-Mountjoy Township to Sturgeon Falls .............................. .23Profile 12 Highway 576-Mountjoy Township-Kamiskotia ....................... .24Profile 13-Kamiskotia Hill .................................................. .25Profile 14-Mallette Lumber Road-Denton to C6te Township .................... .25Profile 15-Highway 101-Hoyle to Munro Township ........................... .26

Recommendations ^to Prospectors .................................................. 27References Cited .................................................................. .29Selected Bibliography on the Survey Area ............................................ 32

TABLES

l Specific Gravity of Rocks in the Timmins-Matheson Area ............................ .9

FIGURES

1 Key map showing survey area ................................................... .v2 Sample gravity station card ...................................................... .4

Hi

CHART A

(back pocket)

3—Profile l—Munro Mine to Holtyre4—Profile 2—Carr-Beatty Township Boundary4-Profile 3-Carr-Beatty Township-Lot 2-3 Boundary6-Profile 4—Garr Township—Lot 4-5 Boundary7-Profile 5—Highway 11-101 Junction to Monteith8-Profile 6-Highway 577, Shillington to Highway 119-Profile 7—Highway 67, Barbers Bay to Macklem Township

10-Profile 8-Highway 575, Nighthawk Lake Peninsula11-Profile 9-Ice Chest Lake Road12-Profile 10-Deloro Township-Wark Township

CHART B

(back pocket)

13-Profile 11—Mountjoy Township-Sturgeon Falls14-Profile 12—Highway 576-Mounitjoy Township-Kamiskotia15-Profile 13-Kamiskotia Hill16-Profilo 14-Mallette Lumber Road-Denton to C6te Township17-Profile 15-Highway 101-Hoyle to Munro Township

GEOPHYSICAL MAPS

(back pocket)

Map 2321—Bouguer Gravity Map of the Timrninis-Matheson Area. Scale, l inch to 4 miles (1:253,440).

Map 2322—Interpretation of Gravity Data from the Timmins-Matheson Area. Scale, l inch to 4 miles (1:253,440).

IV

ABSTRACT

A gravity survey in the Timmins and Matheson area was carried out in 1970 with the purpose of mapping geological structures such as the Destor-Porcupine Fault, the Kamiskotia Complex, and metavolcanic belts in the region. The initial part of the program involved laying out a base station control network which provided drift control for the detailed survey.

Scale, l inch to 200 miles

Figure 1-Key map showing location of Timmins-Matheson area. Scale, 1 inch to 200 miles (1:12, 672,000).

Detailed profiles were completed in the area in order to define subtle density contrasts between various rock types. Highways and power transmission lines were utilized since accurate elevation data were available along these routes. The main effort of the survey was concentrated on obtaining profiles across the Destor-Porcupine Fault in addition to some profiles that were run over the Kamiskotia Complex. In the vicinity of Night Hawk Lake and Highway 67, a northwest-trending fault interrupts a metasedimentary zone which extends west from Guibord Township through Matheson to Stock and German Townships. The interpretation of the gravity data indicates that this metasedimentary zone which is parallel to and on the north side of the Destor-Porcupine Fault is very shallow, of the order of l to 1.5 miles (1.6 to 2.4 km). The contacts of the metasedimentary zone with the mafic metavolcanics on the north and south sides vary between vertical and inclined toward the centre of the metasedimentary zone. A major crustal fault is not evident from the gravity data. This suggests that the Destor-Porcupine Fault is in fact a shear zone connected with the contact between mafic metavolcanics and metasediments.

Profiles over the Kamiskotia Complex show that the contacts of the complex with the

surrounding metavolcanics are essentially vertical. The contoured gravity results indicate that the Kamiskotia Complex coincides with part of a gravity high which trends in a northeast direction from Whitesides Township to Hanna Township. This high, known as the Kamiskotia- Kidd Gravity High, is interpreted to be a series of volcanic centres containing associated mafic intrusions such as gabbro, norite, gabbro-anorthosite and peridotite. Thick accumulations of basalt lava may also be responsible for isolated highs within the Kamiskotia-Kidd Gravity High. Massive sulphide base metal deposits flank individual highs associated with volcanic- intrusive centres within the Kamiskotia-Kidd Gravity High.

The contoured gravity data when compared to regional geological compilations show that the gravity survey has outlined major geological features quite well. In some cases it shows that density contrasts between rock types in different areas stand out better than magnetic susceptibility contrasts. This can be seen by comparing the gravity results in Map 2321 with aeromagnetic map G7085 (Geological Survey of Canada 1970). Characterstic gravity values for different types of metavolcanic rock as well as metasedimentary zones, felsic and mafic intrusive rocks can be used as a guide to interpreting the geology of areas with no outcrop. Thus gravity surveys, combined with airborne magnetic data and ground geological data, are an invaluable aid to the interpretation of regional geology.

VI

Gravity Surveyof

Geological Structuresin the

Timmins and Matheson AreaDistricts of Cochrane, Timiskaming, and Sudbury

by

R. S. Middleton 1

INTRODUCTION

A gravity survey, establishing gravity control stations and profiling geological struc tures in the Timmins and Matheson area was carried out in the 1970 field season. The location of the survey area is given in Figure 1. It comprised 79 base stations and 867 detail readings. In addition about 250 stations of the Earth Physics Branch, Department of Energy, Mines and Resources, were used. The purpose of the survey was to evaluate the use of gravity observations in studying faults and intrusions in northeastern Ontario. The Destor-Porcupine Fault and the Kamiskotia intrusive complex were the main features of interest. Density contrasts between rock types may exist where magnetic susceptibility contrasts may not exist. Therefore, gravity surveying is potentially an ideal method for ascertaining or defining structures that may or may not be interpreted from regional airborne magnetic survey results.

The Destor-Porcupine Fault has been mapped on the Timmins-Kirkland Lake Geological Compilation Sheet, Number 2205 (Pyke et al. 1973), from past geological reports and from various company records. This fault and associated parallel faults have been a focus of attention for gold exploration. In addition, the Destor-Porcupine Fault is a geological boundary between metavolcanics and a zone of metasediments within the survey area. This geological boundary appears to divide the rocks of the Timmins area into two groups. For example, oxide iron formation is common south of the Destor-Porcupine Fault, whereas it is rare north of the fault.

Metasediments associated with, or derived from volcanic rocks, are widespread north of the fault. The intent of the survey was, therefore, to establish the location of the fault, observe its character at various points and determine if the fault was a major crustal feature. If this were the case it would explain its possible significance as a geological boundary in the region.

1Geophysicist, Geological Branch, Ontario Division of Mines, Toronto. Manuscript approved for publication by the Chief Geologist, 1974.

Gravity Survey — Timmins, Matheson

The magnetic character of the Kamiskotia Complex is complicated and the outline of this geological feature is not clearly defined by magnetic mapping (Middleton 1970, 1971, 1973; GSC 1964). Gravity profiles over the suspected contact of this geological body were carried out to determine the shape of the body and location of the contact with surrounding metavolcanics.

Fifteen profiles were completed of which 12 were designed to study the Destor- Porcupine Fault and surrounding rocks, and 3 were completed over the Kamiskotia Complex. Highways and power transmission lines were primarily used since very accurate elevation control was available. Spirit levelling was necessary to complete some profiles.

Previous Geophysical and Geological Work

Gravity profiles through the survey area were completed by G.D. Garland in 1946 in order to outline regional geological features in Northern Ontario (Garland 1950). Other regional surveys have been completed by the Dominion Observatory (now the Gravity Division, Earth Physics Branch, Department of Energy, Mines and Resources). Results of these surveys have been compiled on Gravity Map Series Sheet No. 58, Dominion Observatories Branch (1966) and Gravity Map of Canada, Dominion Observa tories Branch (1967). Gravity surveys have also been carried out by private mining companies on a limited basis. Reports on some of these surveys are available in the assessment files at the Resident Geologist Offices in Timmins and Kirkland Lake as well as in the Assessment Research Library of the ODM in Toronto.

Base stations established by the Gravity Division, Earth Physics Branch, in the area are described by Winter (1967) and Winter and Ferrier (1968). Detailed descriptions of the ODM base stations are given by Middleton (1972).

Geological mapping of areas covering the Destor-Porcupine Fault, the Kamiskotia region and the Timmins and Matheson district has been carried out extensively by the Ontario Department of Mines over the years. A "Selected Bibliography" of geological work on the region covered by the gravity survey is presented as an appendix to this report. In addition to the geological work by the Ontario Department of Mines, aero magnetic surveys published jointly by the Geological Survey of Canada and the Ontario Department of Mines have been issued at a scale of l inch to l mile (1:63,360) for the whole area.

Acknowledgments

The author was ably assisted by T.R.J. Wilson, H. Elliot, B.W. Powell, P. Strandberg and W. Moon during the 1970 field season. In 1971, W. Moon, D. Conley, P. Strandberg and P. Mark provided capable assistance. P. Mark also helped in the preparation of the profiles and final contour map.

The author is very grateful for elevation data within the survey area provided by a number of government agencies. Ontario Hydro Commission elevation profiles of trans mission lines were provided by H. McCuish and staff. Elevation profiles of highways and structures were reproduced by the staff of the Ontario Department of Highways in North Bay and Thunder Bay. Details of bench marks and their location were provided

by the Surveys and Mapping Branch of the Department of Energy, Mines and Resources, Ottawa.

The Gravity Division of the Earth Physics Branch, Department of Energy, Mines and Resources, provided the Worden gravimeter No. 460 used in the survey. In addi tion, the data were processed on the computer of the Gravity Division. Field checking and tie-in work on gravity control stations with a LaCoste-Romberg gravimeter was carried out in 1971 by P. Winter of the Gravity Division. Guidance during the survey was received from B. Boyd, K. Mcdonnell, P. Winter and M. Inner of the Gravity Division.

Gravity data within the survey area, additional to the readings taken in this survey, were provided from the files of the Gravity Division, Earth Physics Branch, in order to complete the contoured map (back pocket).

Specific gravities of rock samples gathered by the field party were measured by the Mineral Research Branch, Ontario Division of Mines.

GRAVITY SURVEY

Survey Method

Gravity readings were taken at points of known elevation with a Worden gravimeter, Serial No. 460 (scale constant 0.45723 mgals/Div). Road and power lines that crossed the Destor-Porcupine Fault, the Kamiskotia Complex, and the general area of Timmins and Matheson were used for most of the survey, although a few irregular grid readings were taken in the vicinity of Kamiskotia Lake. A baseline cut by the field party was also used to obtain a gravity profile over Kamiskotia Hill in Robb Township. Points of known elevation were obtained from profiles and plans of highways, bench marks and profiles of power transmission lines. Gravity observation sites such as those in the Kamiskotia Hill profile the elevations of which were not known were spirit levelled by the field party.

Elevations obtained from the highway plans were usually known to an accuracy of one tenth of a foot (3 cm) above sea level, while the power line transmission data were usually accurate to ± l foot (0.3 m).

Gravity readings were tied to a control station network which was in turn tied to the Gravity Net of Canada. This detailed gravity control net was established in the Timmins, Matheson, and Cobalt area during the initial phase of the survey, Middleton (1972). Detailed observations were tied to the base stations at approximately one hour intervals in order to correct for drift in the instrument. At each observation site, the station number, gravity reading (in divisions), time (G.M.T.), elevation (in feet), instrument temperature ( 0 Celsius), and height of instrument (in tenths of feet) was recorded. The Worden meter used was vacuum sealed to offset temperature drift. An optional temperature control system which uses a heating device was not used during the survey. These data along with the latitude and longitude of the station or the Uni versal Transverse Mercator grid co-ordinates were later compiled from the field notebook onto cards as shown in Figure 2.

Other principal facts recorded on the Gravity Detail Station Card are the year, month, day, field book number (F.B.), Elevation accuracy factor (E.A.F.), Elevation datum factor


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Scale of Map

1^ ± 1m 2= 1:25,000 map 3 = 1:50,000 map 4= 1:125,000 map 5^: 1:250,000 map 6= 1:500,000 map7 = 1:1,000,000 map8 ^ ± 1000 m9 = Unknown

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1 ^ ± 0.1 foot (0.03m)2 ^ ± l foot (0.3m)3 rr ± 3 feet (0.91 m) 4^ ± 10 feet (3.05m) 5^ ± 25 feet (7.62m) 6^ ± 100 feet (30.48m) 9 = Unknown

The elevation datum factor which was used to code the accuracy of the elevation datum was taken from the following:

1 = Geodetic datum2 ^ Sea level3 = Local (floating) 9 = Unknown

From these station cards, computer cards were key punched. The punched cards were then used to process the readings on the computer using programs written by the Gravity Division, Earth Physics Branch. A detailed description of gravity data handling has been given by Tanner and Buck (1964). In the computer processing stage, the instrument drift, earth tide correction, elevation correction, Bouguer correction, and free air corrections were made resulting in a "Preliminary Value of G" (the earth's gravity) and a Bouguer gravity value for each site. The overall accuracy of the surveys is estimated to be ± 0.1 milligal.

A total of 79 base control stations and 876 detailed stations were established in the survey area. The Bouguer values are presented in profile form for 15 traverses and are compiled with previous data from the Gravity Division Files, Earth Physics Branch to give a contoured Bouguer Gravity Map of the Timmins-Matheson area (see back pocket).

5


Corrections to F*ield Readings

A number of corrections to the field readings are made to obtain the Bouguer gravity values. These corrections are described in detail below.

DRIFT CORRECTION AND SCALE CONSTANT

Corrections to instrument drift are made by taking a reading at base control station at regular intervals. In this survey, base checks were made every hour. The drift in the instrument over the period of time between base checks is therefore, the difference in the change of gravity between the base stations according to the readings compared to the known difference in gravity between the control stations. The known gravity differ ences (known A G) between control stations were established prior to the survey (R.S. Middleton 1972).

(Reading at base A in divisions X Scale constant) —(Reading at base B in divisions X Scale constant) =

AGi (Difference in gravity in milligals).

AGi — known AG = ± drift

The drift is distributed to all of the readings assuming a linear instrument drift with time. Since the time at each detailed station reading is recorded, this distribution is then straightforward.

Long term changes in the instrument due to relaxation of the quartz spring system are checked at the beginning and end of the field season by taking readings at a number of gravity control stations along a gravity test range between Ottawa and Prescott, Ontario. Base loops A-B-A-B are read to establish instrument drift during the test. The above base stations have accurately known gravity values, thus the difference in number of instru ment divisions between each station is obtained during the base loop procedure and is divided into the known gravity difference yielding a scale constant in milligals per division. The scale constant for the gravimeter used in the survey was determined by this process and was found to be 0.45723 milligals per division.

THEORETICAL GRAVITY CORRECTION

Since the earth's shape is not a perfect sphere, the distance to the centre of the earth from points on the earth's surface varies. As one goes toward the poles, the distance to the centre of the earth decreases, thus there is an increase in the gravitational force. This

is evident from Newton's Law of gravitational attraction F ^ y—-^— where F is the

force of mutual attraction, y the universal gravitational constant, mi the mass on the end of the springs in the gravimeter, m2 the mass of the earth and r the distance to the centre of the earth. The change in milligals is in the order of 10,000 between the equator

and the poles (Dobrin I960). In order to correct for this change in gravity and to allow for a comparison of gravity readings throughout the country and the rest of the world, a reference spheroid surface was devised.

The following formula is therefore used to correct gravity readings assuming the earth to have the shape of a spheroid described in the 1924 International formula:

gt rr 978.049 (l + 0.0052884 sin20 — 0.0000059 sin220)

where gt is the theoretical value of gravity in gals, and 9 is the latitude of the observation point (Dobrin I960, p.187). In addition, another reference surface called the geoid, which closely approximates the International 1924 spheroid, is used in other corrections. The geoid is defined by Bowie (1931) as "Under land areas the geoid surface is that which would coincide with water surfaces in narrow sea-level canals if they were extended through the continents".

ELEVATION CORRECTION—BOUGUER AND FREE-AIR CORRECTION

On the continents, the observation point is usually some distance (h) above mean sea level (the geoid) and "h" farther from the earth's centre gives a lower reading than would have been obtained at sea level. This correction is called the "Free Air correction" and is added to the gravity value. It is in the order of -f- 0.094 milligals per foot above sea level.

The existence of crustal material between the observation point and the geoid causes gravitational attraction, thus giving an increase in the reading. In order to correct for the attraction of this material a negative correction must be applied to the reading. The effect of the crustal material in milligals is expressed by — Ag = 2nyah where h is the height above sea level, a is the density of the material which is assumed to be 2.67g/cm3, n = 3.14, and y is the universal gravitational constant. 1 This gives a correction of of —0.034 milligals per foot.

The combined Free Air and Bouguer correction is, therefore, (0.094 — 0.034) h — -[-0.060 h milligals per foot.

A Bouguer gravity value in this survey is, therefore:

Observed gravity -f- free air correction — Bouguer correction — theoretical gravity = Bouguer value.

INSTRUMENT HEIGHT CORRECTION

The height of the gravimeter above the observation point (with known elevation A.S.L.) is recorded and applied to determine the exact height of the instrument above sea level. When using a small aluminum dish as a base for the instrument, the normal height of the instrument above ground was of the order of 0.3 feet (9 cm). When the1 In cgs units the gravitational constant is 6.67 X 10~ 8cmVg sec2 .


wood tripod was used, the height of instrument was frequently of the order of 1.5 feet (46cm).

TERRAIN CORRECTION

Terrain corrections account for the effect of irregular topographic effects on the observed gravity. For instance, the presence of a large mountain or a deep valley near the observation point will add to or subtract from the gravitational force. In order to make this correction a graduated template is placed on a topographic map and the con tribution of the terrain in each sector of the template is calculated in milligals per foot of elevation within the sector. In the case of the present survey, topographic or terrain corrections were not made because the region surveyed was relatively flat.

EARTH TIDE CORRECTION

The gravitational effect of the sun and the moon is periodic and is in the order of ±0.3 milligals. These gravity variations have been observed in the past, and tables of these variations have been created (A. Wolf 1940).

When the field gravity data were reduced with the help of computer programs written by the Earth Physics Branch in Ottawa, the earth tide corrections were made. This is possible since the exact time (G.M.T.) and co-ordinates are recorded at each station, this allowing the computer to locate the proper correction from earth tide tables stored in its memory.

Specific Gravity off Rocks

Drill core and outcrop samples were collected throughout the survey area in order to determine the specific gravity of the different rock types occurring in the region. Knowl edge of the specific gravity contrasts is essential in detailed interpretation of the gravity data. Approximately 1,500 samples were collected and measured. Insufficient numbers of samples of some rock types did not allow a representative histogram of specific gravities to be plotted for each rock type. Therefore, a table of specific gravity ranges is presented. Histograms of some rock types are given in Middleton (in preparation). A compilation of specific gravity data of rocks in Canada is kept by the Gravity Division, Earth Physics Branch. The reader should also refer to a paper by Gibb, R.A. (1968) for further refer ence to densities of rocks from the Canadian Shield.

It was noted that the gabbro-anorthosite-norite samples from the Kamiskotia Com plex had above normal specific gravities. This is explained by the high epidote, oxide and sulphide content of these rocks (Middleton 1973).

Densities of rocks in the survey area have also been reported by Gibb and van Boeckel (1970) and Moon (1972).

8

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S AND METASEDIMENTS

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Interpretation

The gravity data gathered m the survey have been presented in contour form on a map entitled Bouguer Gravity Map of the Timmins and Matheson Areas, District of Cochrane, Ontario, and enclosed in the back of this report. In addition, detailed profiles are presented later in this section. The profiles represent traverses across major geological features such as the Destor-Porcupine Fault and the Kamiskotia Complex. Geological sections based upon interpretation of the gravity profiles and the geological compilation sheet No. 2205 by D.R. Pyke et al. (1973), are presented with the profile diagrams Interpretations of the contour results have been made both independently of the known geological data as well as using the geological map by D.R. Pyke et al. ( 1973) to make direct correlations.

REGIONAL GRAVITY INTERPRETATION

Felsic Intrusive Rocks

Intense gravity lows have been outlined in a number of places within the map-area which coincide with zones of felsic intrusive rocks contained in small batholiths. In the extreme southeast corner of the map sheet, a gravity low of the order of —62 milligals is associated with the Otto Stock (or Round Lake Batholith) which is composed of syenide alkalic rocks. In the southeast quarter of the map sheet, another gravity low of the order of —64 milligals is associated with the Watabeag Lake Batholith. This gravity low extends from southwestern McCann Township to northern Holmes Town ship. Its axis runs in a north-south direction, although the contours suggest an associated intrusion to the west occurring in Fasken and Blackstock Townships. The eastern margin of the Watabeag Batholith is well defined by tht gravity contours which suggest that this side of the intrusion is in contact with the mafic metavolcanics and mafic intrusions which occur ih Playfair, Black, Lee and Grenfell Townships (shown as Playfair-Grenfell Gravity High on map 2322). This contact trends in a N15 0W direction and may be steeply dipping or vertical.

Work by Gibb and van Boeckel (1970) on the Round Lake batholith (Otto Tp.) and vicinity suggests that the felsic intrusions in the area extend to depths of the order of 5-10 kilometers (3-6 miles).

Another gravity low occurs in the vicinity of Kenogamissi Lake and extends north eastward to Adams Township. The main axis of this low runs in a northeasterly direc tion. However, it has a western extension which suggests that the felsic intrusive rocks on the western edge of the map sheet are linked to the felsic intrusions in the Kenoga missi Lake area. Another gravity low occurring in Fortune, Enid and Frey Townships is associated with a complex felsic batholith which terminates the western extent of the Abitibi Greenstone belt. The axis of the gravity low where it appears on the western margin of the map-area is trending north-south.

10

Small gravity lows have been outlined on the northern edge of the map sheet in three locations. In Nesbitt Township, a —50 milligal gravity low may reflect a felsic intrusion at depth. The geological compilation by Pyke et al. ( 1973) suggests that the rocks in this township are mainly mafic-metavolcanic, although felsic intrusions are known to occur in Aubin Township immediately to the west of this gravity low.

A second gravity low of down to —54 milligal situated in St. John Township coincides with a felsic intrusion located in northern Aurora Township, northern New market Township, St. John Township, Pyne Township and eastern Hanna Township.

A third gravity low reaching —56 milligals reflects felsic intrusions occurring in Sweetman, Findlay, Henley and Pliny Townships. A zone of metasediments occurring along the southern contact of this felsic intrusion may also contribute to this low.

Isolated gravity lows in Michaud Township as part of a larger east-west trending low, reflect small felsic intrusive stocks along the axis of the metasedimentary zone which extends from German Township in the west to Guibord Township in the east.

Metavolcanic Zones

A prominent gravity high which extends from Whitesides Township in the west- central part to Hanna Township in the north-central part of the map-area has been out lined by the gravity survey. This high is in the vicinity of the Kamiskotia and Kidd Creek mining areas, and has therefore been named the Kamiskotia-Kidd Gravity High. Within this regional gravity high, isolated highs of the order of —30 milligals or greater are associated in some cases with mafic and ultramafic intrusions.

Known mafic intrusions occur in the Whitesides, Turnbull and Robb Townships area. Two gravity highs (Whiteside and Robb) have outlined the main part of these intrusions which are known collectively as the Kamiskotia Complex. The rocks in this complex are composed of gabbro, gabbro-anorthosite, and norite. Pegmatitic phases are common in Robb Township and northern Turnbull Township (Middleton 1973). High percentages of ilmenite and pyrite observed throughout the intrusion account in part for the high specific gravities of these rocks. High density basalts surrounding the Kamiskotia Complex have specific gravities in the 2.9-3.0 g/cm3 range and also contribute to the gravity anomalies occurring in the area. The southeastern margin of the Kamiskotia-Kidd Gravity High coincides with the contact of metavolcanics with metasediments that occur in south eastern Godfrey, Mountjoy, Jessop and Wark Townships. This margin of the high trends in a northeast direction from the Jamieson-Godfrey Township boundary to Little Town ship. However, in Godfrey and Bristol Townships, where there is a large accumulation of felsic metavolcanic rocks, the rim of the gravity high turns into a north-south direction.

A gravity high centred in western Kidd Township (Kidd Creek Gravity High) also reflects a large accumulation of mafic metavolcanics with associated mafic intrusions. A less pronounced gravity high associated with a mafic intrusion in northwestern Reid Township (Geary-Reid Gravity High) trends in a northwest direction reflecting a belt of mafic metavolcanics as well as the intrusion.

A gravity high of up to —22 milligals is centred in northwestern Prosser Township (Prosser Gravity High). This anomaly is essentially outlined by the —30 milligal contour and extends into northeastern Carnegie, eastern Crawford and Lucas Townships. Rocks in this area are composed of both mafic and felsic metavolcanics with intrusions of gabbro and peridotite.

11


A small gravity high of the order of —30 milligals occurs in central Hanna Township (Hanna Gravity High) and coincides with mafic metavolcanics as well as peridotite intrusions.

It is interesting to note that the major base metal producers in the Timmins area lie within the Kamiskotia-Kidd Gravity High and that in most cases, the deposits flank the margins of isolated highs within this major feature.

A possible eastward continuation of the Kamiskotia-Kidd Gravity High trends in an east-west direction parallel to the Abitibi River and extends from Highway 11 immedi ately west of Ansonville to Lake Abitibi (Abitibi River Gravity High). This zone is covered by thick overburden but is known to contain mafic metavolcanics, isolated felsic metavolcanic areas and mafic intrusions (Simony 1965).

West of Matheson, an elongated gravity high of up to —36 milligals extends in an east-west direction south of and parallel to Highway 101. It appears as Matheson Meta volcanics on Map 2322. This trend changes to a southwest direction in Macklem Town ship suggesting that the rocks in the Langmuir Township area are related to the volcanic rocks associated with this gravity high.

On the southern margin of the map sheet in the vicinity of Argyle, Hincks, McNeil and Cleaver Townships, a gravity high outlined by the —50 milligal contour (Argyle Metavolcanics on Map 2322) indicates the presence of a thick accumulation of mafic metavolcanics and mafic intrusions. The contour map shows a connection between the rocks in this area and those in Blackstock and eastern Langmuir Townships and directly west of Matheson. In the southwest corner of the map sheet, a gravity high of the order of —40 milligals trends in a west-northwest direction (Sewell-Pharand Gravity High), reflecting remnants of mafic metavolcanics which extended from Sewell and Kenogaming Townships to Pharand Township. It appears from the gravity map that the metavolcanics and associated intrusions in Bartlett, McArthur, Fripp and Price Townships have been physically separated from the metavolcanics in the Sewell Township area by the Keno- gamissi Lake felsic intrusions.

On the eastern margin of the map, an extensive gravity high trends in a N25 0W direction from Grenfell Township to Playfair Township (Playfair-Grenfell Gravity High). Rocks in this area are composed mainly of mafic metavolcanics with numerous gabbroic intrusions.

Metasedimentary Zones

A gravity low extends in an east-west direction across the central part of the map sheet from Guibord Township in the east to Mountjoy Township in the west. This gravity low is well defined as a narrow zone east of Highway 67 but becomes much broader west of it. The northwestern border of this gravity low west of Highway 67 is defined by the southeastern margin of the Kamiskotia-Kidd Gravity High. A detailed analysis of this metasedimentary zone is given in the description of individual profiles which were completed over this zone.

Another area of metasediments occurs in the northeast corner of the map sheet and has been poorly defined by the gravity anomaly patterns because detailed readings are not available. The axis of this metasedimentary zone trends in an east-west direction and extends westward from the northwest corner of Lake Abitibi.

12

Faulting

A number of major regional faults are indicated by strong gradients on the gravity contour map and are outlined on the interpretation map. Faults in a northwesterly direction are particularly noticeable due to the termination of a number of east-west gravity trends.

The Playfair-Grenfell Gravity High appears to be bounded by faults on the east and west side. The western fault appears to be an extension of the Black River Fault, whereas the eastern margin appears to be associated with the Hislop Fault. These two faults are interpreted to be responsible for an uplifted block which is evident from a relative gravity high in Carr Township that interrupts an east-west trending gravity low. Both the Hislop and the Black River Faults cross the Destor-Porcupine Fault and are characteristic of a number of north west-trend ing faults which occur in the central part of the map sheet and can also be recognized on Aeromagnetic Map 7085 (GSC 1970). These faults are known as the Timiskaming system of faults and have been previously described by Parkinson (1962), and Lovell and Caine (1970). The Hislop Fault may be a northward extension of the Lake Timiskaming West Shoreline Fault since the eastern margins of both faults are downthrown. If this is the case this fault has been active as late as Paleozoic times, because Ordovician rocks have been displaced by these faults.

It is possible, however, that the Black River is the northward extension of the Lake Timiskaming West Shoreline Fault. In this case the Hislop and the Black River Faults would have to be a "scissor-type" fault where the northern portion of the fault block in the vicinity of Matheson is uplifted and the southern portion in the vicinity of Lake Timiskaming and Earlton downthrown. The point at which there is no vertical movement possibly occurs in the vicinity of the Round Lake Batholith (Otto Stock on Map 2322). However, it is known from work by Gibb and van Boeckel (1970) that other faults trending in a northwest direction such as the Cross Lake Fault have vertically displaced portions of the Round Lake Batholith.

A fault is interpreted to occur southwest of Frederick House Lake that cuts the Stock- Carr-Guibord Metasedimentary Zone at the western end. This fault, the Buskegau River Fault, appears to be the northward extension of the Cross Lake Fault. In the study of the Round Lake Batholith by Gibb and van Boeckel (1970) the Cross Lake Fault was inter preted to have its western side uplifted three kilometres. However, in the vicinity of Night Hawk Lake and Frederick House Lake, the eastern margin of its continuation appears to be uplifted since a broad metasedimentary basin is interpreted to occur southwest of Frederick House Lake. The Cross Lake-Buskegau River Fault would, there fore, appear to be another "scissor-type" fault with the western side uplifted at the south end and downthrown in the northern part of the fault. This type of fault action would contribute to a thickening of the section of metavolcanics in the Prosser, Lucas, Crawford and Carnegie Townships area. This could partly account for the strong anomaly of the Prosser Gravity High mentioned before which may also be caused by mafic intrusions.

The Montreal River Fault is not well defined by the gravity data. However, the gravity anomaly associated with the Argyle metavolcanic area is terminated on its eastern margin by this fault. North of Timmins in Carnegie and Mahaffy Townships, the Montreal River Fault and some associated parallel faults divide the Kamiskotia-Kidd Gravity High into two portions, the Prosser and Kidd Creek Gravity Highs. It appears

13


possible that a downfaulted block occurs between these two highs that is bounded by the Montreal River Fault on the west and a parallel fault on the east side.

The Mattagami River Fault which extends from Beemer on the southern margin to Aubin Township on the northern margin of the map-area, controls the shape of the southeastern margin of the Kamiskotia-Kidd Gravity High. This fault delimits the western extent of the Kidd Creek Gravity High. The presence of gravity highs on both sides of the Mattagami River fault makes it difficult to determine which side is uplifted. However, evidence from the Godfrey-Jamieson Townships area (given in the description of Profile 12 later in this report and shown in Figure 14) suggests that it is the western side. Uplifting of this side of the Mattagami River Fault explains the predominance of felsic intrusive rocks and metamorphic rocks to the west of it in the Musgrove and Beemer Townships area.

The western edge of the map sheet is mainly underlain by felsic intrusive rocks. Strong gradients in the gravity patterns on the contour map suggest that the contact between the felsic intrusive rocks and the Abitibi Greenstone Belt occurs at faults which trend in a north-south direction.

PROFILE DESCRIPTIONS

Profile 1—Munro Mine to Holtyre

Gravity readings were taken along Highway 572 and the road leading from the Highway 101 north to the Munro Mine in order to determine the gravity field over the Destor-Porcupine Fault and a metasedimentary zone on its north side. The traverse created a north-south profile which is shown in Figure 3. Elevations along the profile were determined by spirit leveling, and the elevation datum was an accurately known elevation at a culvert located at the junction of Highway 101 and Highway 572.

The profile illustrates a gravity low over the metasedimentary zone and an increase in gravity in the northern and southern portion of the profile over mafic metavolcanic rocks. The shape of the profile suggests that the contacts on the north and south sides of the sedimentary zone dip toward the centre of the metasedimentary zone. If the contacts were vertical, a more abrupt change in the gravity response over the mafic metavolcanic-sediment contact would be observed. In surface outcrops, the dip of the metasediments. and probably the contact, is vertical, suggesting that the dip of the contacts changes from vertical at surface to inclined at depth.

Calculations, to determine the depth extent of the sedimentary zone have been made using a geological model represented by an inverted isosceles triangle. The formula for the gravity response over an isosceles triangle modified from Grant and West (1965, p.290) is expressed as follows:

Ag max = 4yApW{ -j—- H - -f h In h

where: Agmax = the vertical component of gravity in milligals 6.67 x l(T 8cm3

•y — ———————————————g sec2 W = Vi of the width of the zone at surface

h = the depth factor Ap = the density contrast in g/cm3 W = 6,600 feet (2,012 m) and Ag max = 8 milligals

14

A density contrast of 0.2 g/cm3 gives a depth of 6,068 feet (1,850 m). If a density contrast of 0.3 g/cm3 is used, a depth of 3,430 feet (1,045 m) is obtained. A number of samples of basalt in the region have a density of 2.90 g/cm3, while a number of sediments were found to have densities of 2.68. Therefore, a density contrast of 0.2 g/cm3 would appear to be the closest to the actual case.

Depth calculations were also made using the buried sphere as a geological model. The computations were carried out to see what depth figures would result from a poor model approximation. The formula for the gravity response over a buried sphere is given by M. Dobrin, (I960) as follows:

fc-8.!

where: gz = vertical component of gravity in milligals Ap = density contrast in g/cm3

R = radius of sphere in kilofeet* h = depth to centre of sphere in kilofeet x = horizontal distance from point directly over

buried sphere in kilofeet.

With Ap = 0.2 g/cm3, R rr 6.6 kilofeet (2,012 m), x ^ O and A g max ^ 8 milligals, the depth to the centre of the buried sphere is calculated to be 7,830 feet (2,387 m). Therefore the depth to the bottom of the sphere is 14,430 feet (4,397 m). The depth determination with this method gives a depth greater than that for the isosceles triangle because the material above the sphere is considered to be basalt. Geological mapping shows however, that metasediments occur at surface.

A third depth calculation was made utilizing the formula for an infinite slab of density contrast 0.2 g/cm3 . The formula given by Nettleton (1971, p.52) (or Dobrin I960, p. 175) for the infinite slab is given as:

AGmax rrr 12.77(7twhere AGmax = maximum gravity anomaly in milligals

o — density contrast in g/cm3 t = slab thickness in kilofeet

The thickness of the infinite slab was determined to be 3,130 feet (954 m) where G.max r^ 8 milligals and a = 0.2 g/cm3.

A fourth calculation using a horizontal cylinder model was carried out employing a formula given by Dobrin (I960, p.174,259) as modified from Nettleton (1942):

12.77aR2oz Z

where: ^ ^ vertical component of gravity at distance xfrom point centred over cylinder in milligals

ff = density contrast g/cm3 R r^ radius of the cylinder in kilofeet z rr depth to the centre of the cylinder x ^ distance in kilofeet from point directly over cylinder

l kilofeet equals 1000 feet.

15


Using a density contrast of 0.2 g/cm3, a radius R = 6.6 kilofeet (2,012 m), x rr: O, the depth to the centre of the cylinder was found to be 13,906 feet (4,239 m). The depth to the bottom of the cylinder is therefore 20,506 feet (6,250 m). The same problem of overlying material that was encountered in the case of the buried sphere applies here. It is known that the metasediments outcrop over a width of approximately 13,200 feet (4,023 m). Therefore, the horizontal cylinder model does not fit the situation since, according to this calculation, the cylinder is completely buried.

It appears therefore, that the maximum depth of the sedimentary body in the vicinity of the junction of Munro, Beatty, Hislop and Guibord Townships is between 3,100 feet (945 m) and 20,506 feet (6,950 m). However, the most reasonable depth seems to be 6,270 feet (1,911 m) as given by the isosceles triangle model. The gravity profile suggests that the metasediments are contained in a structure such as a syncline since the shape of the gravity curve indicated inclined contacts on the north and south sides of the metasedimentary zone. The depth extent of this zone is surprisingly shallow. If the metasediments were a single formation extending to depth, the formation would not be expected to pinch out so abruptly unless the metasedimentary zone is synclinal.

The Destor-Porcupine Fault which is postulated to occur on the southern contact of the metasedimentary zone is not reflected directly in the gravity picture, indicating that this fault does not form a vertical structural boundary of the metasedimentary zone. This suggests that the Destor-Porcupine Fault is a shear zone within the mafic metavolcanics and runs parallel to the plan view of the contact between the metasedimentary zone and the mafic metavolcanics. Another model that could be envisaged would have the metasedimentary zone as a downfaulted block between the Destor-Porcupine Fault on the southern margin, and extensions of the Pipestone Fault along the northern contact. Then the metasediment-filled syncline along with the underlying mafic metavolcanics would have to have subsided as one unit. However, there is no gravimetric evidence for such an assumption.

A ground VLF electromagnetic profile was run simultaneously with the gravity survey, along Profile 1. However, no significant conductive features were found in the vicinity of the postulated Destor-Porcupine Fault as shown by Prest (1951). A helicopter-borne VLF electromagnetic, magnetic, gamma ray spectrometer, and resistivity survey was carried out over the region in 1970. Results of this survey again do not show any conductors in the vicinity of the postulated Destor-Porcupine Fault, but the magnetic results show a very definite contrast between the non-magnetic metasediments and the mafic metavolcanics located on the south side of the metasedimentary zone.

The metasedimentary-mafic volcanic contact as interpreted from the helicopter-borne magnetic survey of Hislop and Guibord Townships follows the contact as shown by Prest (1957). These airborne geophysical maps have been published by the Ontario Department of Mines and Northern Affairs (1971).

Profile 2—Carr-Beatty Township Boundary

A gravity low of approximately —45 milligals on the Bouguer gravity profile was observed over the centre of the metasedimentary zone north of Highway 101 on the Carr-Beatty Township boundary. Comparing this profile with profile #1, it is evident that the metasedimentary zone has become shallower along the Beatty-Carr Township boundary relative to the depth of metasediments in southeastern Beatty Township.

16

According to the contoured gravity map, a fault trending N25 0W appears to displace the metasedimentary belt in west central Beatty Township. Although this fault is shown on Geological Compilation Sheet 2205 (Pyke et at. 1973), no displace ment of the Destor-Porcupine Fault or the metasedimentary belt is indicated on the geological map. The contoured gravity map (Map 2321) indicates however, that this is a major fault (the Hislop Fault) which displaces anomaly patterns across the entire map- area. The fact that the metasediments appear shallower on the west side of this fault indicates the possibility that the west side is uplifted. The contoured gravity results suggest that the westward continuation of the metasedimentary belt from Beatty Town ship is not as well defined as the same belt in Beatty, Hislop and Guibord Townships.

The rapid increase in the Bouguer anomaly values north of the metasedimentary- mafic metavolcanic contact suggests again that the mafic metavolcanic rocks north of the metasedimentary belt have a greater density than those south of the metasedimentary belt.

The depth extent calculated for the metasediments using the model of an inverted isosceles triangle for which the formula is given in the description of Profile l, is 1,220 feet (372 m) for the metasediments in the vicinity of Profile 2.

Profile 3—Carr Township, Lot 2-3 Boundary

A short profile from Highway 101 northward across the Destor-Porcupine Fault and the metasediments occurring north of this fault was carried out in order to compare observations made nearby on Profiles 2 and 4. Unfortunately, lack of access did not allow the field party to complete a traverse to the northern contact between the metasedimentary belt and mafic metavolcanic rocks. However, the profile demonstrates that the density throughout the metasedimentary zone is relatively uniform. Minor variations of the order of 0.25 to 0.5 milligal are observed over the metasedimentary belt, and these can be explained by minor diabase dike intrusions or irregularities in the contact between the metasediments and underlying higher density rocks.

Profile 4—Carr Township, Lot 4-5 Boundary

Profile 4 was run in order to determine the shape of the metasedimentary basin occurring on the north side of the Destor-Porcupine Fault and to determine the char acteristics of this fault. It shows the occurrence of mafic metavolcanic rocks on the south side of the Destor-Porcupine Fault and a relatively smooth Bouguer gravity profile over the metasediments. The profile was terminated on the northern edge of the meta sedimentary zone, and this is indicated by an increase of the gravity values toward the north end. The lowest value on the profile is of the order of —46.5 milligals. This low occurs approximately two-thirds of the way toward the north end of the profile and suggests that the metasediments in this area are thicker than those occurring adjacent to the Destor-Porcupine Fault. The gradual increase in the Bouguer values toward the north end of the profile suggests that the contact between metasediments and mafic metavolcanics may be dipping at a low angle to the south.

17


Profile 5—Highway 11-Highway 101 Junction to Monteith

Profile 5 shows that there is a completely different geological situation occurring in the vicinity of Highway 11 north of Highway 101 as compared to the previous profiles in Carr Township. In this case there is a much more definite contrast between the mafic metavolcanics to the south of the postulated Destor-Porcupine Fault and the metasediments occurring on its north side. Furthermore, there is a very significant gravity low occurring over the metasedimentary zone which has an amplitude of the order of —10 milligals and a Bouguer anomaly minimum of about —48 milligals. The shape of the profile suggests that the metasedimentary zone is wide in Taylor Township. This is partly due to the fact that the profile along Highway 11 runs at a 45 0 angle to the contact between the metasedimentary zone and the mafic metavolcanics. The shape of the profile also suggests that the thickness of the metasedimentary zone decreases north westward. As in the case of Profile 4, the Destor-Porcupine Fault appears to coincide with the contact between the metasedimentary zone and the mafic metavolcanic rocks as is shown on the geological compilation map (Pyke et al. 1973). According to geo logical compilations, this fault occurs at a point where the gravity gradient changes from a high to a low negative value. In the case of a model for a vertical fault, the fault would be expected to occur at the inflection point of the gravity curve, in other words, at the point of steepest gradient.

Profiles 4 and 5 both illustrate a half sine wave shaped gravity profile on the south part of the gravity profile, and these gravity profiles have inflection points occurring at some distance south of the geologically postulated Destor-Porcupine Fault. It may be pos sible that the major fault actually occurs south of, and parallel to, the metasedimentary- metavolcanic contact and that the contact between the metasedimentary zone and the metavolcanics has been assumed by geologists in the past to be the trace of the Destor- Porcupine Fault.

Calculations of the depth of the metasediment zone on the north side of the Destor- Porcupine Fault were made with the formula for an infinite buried slab as given in the interpretation of Profile 1.

A depth of 3,915 feet (1,334 m) was determined by this formula. A density contrast of 0.2 g/cm3 and a total change in gravity of —10 milligals was assumed.

The contoured gravity map shows that there is a rapid decrease in the Bouguer anomaly values to the northeast of Highway 11 suggesting that the metasedimentary belt in this area deepens in northeastern Taylor Township.

It is, therefore, suggested that a major break occurring parallel to and coinciding with the Black River exists that has a down-thrown side to the west of the Black River leaving the metasedimentary zone in Carr Township as an upthrown block occurring between the Black River Fault on the west side and the Hislop Fault on the east side. Evidence for this is given on a geological map of Hislop Township by Prest (1957).

In the southeast corner of Hislop Township and the northeast corner of Playfair Township, a zone of metasedimentary rocks consisting mainly of greywacke and con glomerates occurs abutting against the north-northwest trending Hislop Fault. It may be possible that the east side of this fault is downthrown. This would explain the occurrence of the metasedimentary rocks east of the Hislop Fault. Shearing and bedding directions in the metasediments adjacent to the Hislop Fault suggest that the fault is also a right hand displacement fault. A gravity profile perpendicular to the Hislop Fault

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was accomplished by taking gravity readings along Highway 101. Its results are demon strated in Profile 15 given later in this report. The Hislop Fault is also expressed on the aeromagnetic map of Hislop Township, Ontario Department of Mines and Northern Affairs (1971) by the fact that a number of magnetic anomaly patterns are displaced or are terminated by the trace of the Hislop Fault. The aeromagnetic map also suggests that the Hislop Fault crosses Highway 101 approximately 3 Vi miles (5.6 km) west of the northeast corner of Hislop Township. This point is marked by a curve of Highway 101 around the northern end of a long, linear series of ponds which appear to follow the trace of the fault.

Profile 6—Highway 577, Shillington to Highway 11

A comparison of the gravity data obtained on Profile 6 with a geological compilation of Stock Township by Satterly (1959), shows that the Destor-Porcupine Fault occurs approximately 1V4 to \V2 miles (2 to 2.4 km) north of Shillington. This point cor responds to a diabase dike which trends in an east-northeast direction as shown by airborne magnetic results on Geological Survey of Canada (1956) Aeromagnetic Map 297G.

A gravity low of about —9 milligals (a Bouguer value of —46 milligals) is asso ciated with the metasedimentary zone on the north side of the Destor-Porcupine Fault. A depth calculation using the formula for a buried slab of infinite extent gives a depth of sediments of 3,530 feet (1,200 m). The shape of the gravity profile in the southern third of the traverse suggests that a vertical fault is possible. However, the overall shape of the profile suggests that the contacts between the metasediments and the mafic metavolcanics on the north and south sides of the metasedimentary basin are inclined inward. Diagrams of drilling results in the vicinity of the profile (Northern Miner 1973) suggests that the Destor-Porcupine Fault dips south in this area. If this is the case, the Destor-Porcupine Fault is completely independent of the attitude of the mafic metavolcanic-metasedimentary contact, at least locally.

A depth extent of the metasedimentary zone was also calculated by the formula for an inverted isosceles triangle given earlier in the description for Profile 1. It was deter mined to be 4,920 feet (1,677 m), assuming a density contrast of 0.2 g/cm3 and a total width (2w) of the metasedimentary zone of 5.1 miles (8.2 km). The relatively smooth profile over the metasedimentary zone shows that the contact between the metasediments and the material beneath them is not very irregular. The smoothness also suggests a fairly uniform density throughout the metasedimentary zone. A very low gravity gradient north of the Destor-Porcupine Fault could still be explained by an inclined contact between the mafic metavolcanics and metasediments in the vicinity of the fault. Evidence of ultramafic intrusions in the vicinity of the Destor-Porcupine Fault is not obvious from the gravity profile.

Profile 7—Highway 67, Barbers Bay to Macklem Township

The southern part of Profile 7 shows an area of high density rocks consisting of mafic metavolcanics and ultramafic rocks, probably peridotite and dunite. The profile

19


changes character abruptly at Highway 101 and becomes a relatively level profile with values of the order of —55 milligals. The gravity values increase slowly toward the north end of the profile suggesting that the thickness of the metasedimentary zone associated with the gravity low is decreasing or that the density of the metasediments is increasing northward. Interpretation of Profiles 6, 5, 4, 3, 2 and l, suggests that the northern contact between the metasediments and metavolcanics dips southward beneath the metasediments. This would account for the gentle increase in gravity values near this contact. In Profile 7, the increase in gravity northward is much more subtle than in the previous profiles.

The sharp change in gravity character immediately north of the Destor-Porcupine Fault is quite similar to the results obtained in Profile 4 in Carr Township and in Profile 5 along Highway 11. In Profiles 4 and 5, the Destor-Porcupine Fault as indicated on Geological Compilation Sheet 2205 seems to coincide with the sharp gradient change in the gravity profiles. However, in Profile 7, the fault on the geological map is shown to occur slightly south of the sharp gradient change suggesting that this sharp change is, in fact, a geological contact, not necessarily a fault contact.

The smooth profile over the metasedimentary zone again suggests that the shape of the metasedimentary zone is relatively uniform and that the density variation in the metasedimentary zone is not erratic. A valley noted in the elevation profile may be directly associated with the Destor-Porcupine Fault. Readings taken at the centre of the metasedimentary zone gave values similar to those obtained in Guibord Township. This suggests that the metasediments in this area are of similar thickness as observed in Profile l between the Munro Mine and Holtyre.

Samples taken from an outcrop of conglomerate near the junction of Highway 67 and Highway 101 were found to have a specific gravity of 2.60 g/cm3 thus giving a density contrast with the mafic metavolcanics and metasediments of 0.3 g/cm3 . Calcula tion of the depth of sediments using the model of a buried slab of infinite extent yields a thickness of sediments of 4,180 feet (1,274 m).

Profile 8—Highway 575, Night Hawk Lake Peninsula

Profile 8 down the length of the Night Hawk Lake Peninsula in Cody Township looks like an idealized profile over a vertical contact suggesting that the interface between the metasediments to the north and the mafic metavolcanic rocks to the south is vertical. This contact is similar to that shown in Profile 6 in which the Destor- Porcupine Fault was interpreted to occur beneath the point of steepest gravity gradient on the gravity profile. An identical interpretation is made here. However, as in the case of Profile 6, the possibility still exists that the contact between the mafic meta volcanics and metasediments may be steeply dipping to the north which would explain the gradual decrease in gravity values northward from the postulated Destor-Porcupine Fault. The smoothness of the gravity profile suggests that ultramafic intrusions which have been indicated on Geological Compilation Sheet 2046 (Ginn et al. 1964), do not occur in the Destor-Porcupine Fault zone, but there is a possibility of small ultramafic bodies occurring within the mafic metavolcanic zone. Geological Compilation Map 2205 (Pyke et al. 1973) does not show ultramafic rocks in this zone. The occurrence of small ultramafic bodies may be suggested by slight increases in the gravity value in places south of the Destor-Porcupine Fault in the vicinity of Station 2590. However, these

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subtle variations in the gravity values could be explained by local density changes within the mafic metavolcanics themselves.

Calculation of the depth of the metasediments using the model for an infinite buried slab gives a depth of about 1,570 feet (535 m), assuming a density contrast between the mafic metavolcanics and metasediments of 0.3 g/cm3 .

The contoured gravity map in this area shows that the well defined gravity low associated with the metasedimentary zone on the north side of the Destor-Porcupine Fault changes character completely in the vicinity of this profile. A broad area of low gravity values of the order of —56 to —53 milligals replaces the narrow feature east of Highway 67. It is suggested that a large fault trending in a north-north west direction terminates this well defined metasedimentary zone east of Highway 67 and Kettle Lakes Park that extends to Guibord Township in the eastern part of the survey area. West of Highway 67, the broad gravity low suggests a wider area of metasediments and metavolcanics. The metavolcanics in this area may have lower densities than usual, making it difficult to distinguish them from the metasediments on the gravity map.

Profile 9—Ice Chest Lake Road

Profile No. 9 was recorded along a gravel road which runs perpendicularly to Highway 101 north through Dugwal in Matheson Township to Ice Chest Lake in Evelyn Township. Elevations along this road were obtained by spirit leveling. The gravity profile is generally featureless. However, there is a gradual increase in the gravity values going northward which reflects a general increase in the density of the bedrock. The shape of the profile is completely different from the previously described profiles suggesting that a well defined sedimentary basin does not exist as in the case of the metasedimentary zone east of Highway 67. Geological compilations given on Map 2046 (Ginn et al. 1964), show that mafic metavolcanics occur in central Matheson Township. This could account for the slight increase in gravity north of Dugwal. A one milligal anomaly occurs in the vicinity of Station 25, which coincides with a magnetic high observed on Aeromagnetic Map 7085G. This gravity high and the corresponding magnetic anomaly probably reflect a magnetic phase in the mafic metavolcanics, or a mafic intrusion. The fact that the gravity values remain fairly constant to the north suggests that most of the underlying rock in northern Matheson and southern Evelyn Townships consists of mafic metavolcanic flows, mafic pyroclastics and possibly, interbedded metasediments. A large magnetic anomaly occurring in the vicinity of Ice Chest Lake is not reflected in the last gravity readings on the profile. They remain fairly constant throughout the last third of the profile and do not show an increase in the area of the airborne magnetic anomaly. This suggests that there is very little density contrast between the body causing the magnetic anomaly and the surround ing rock. The magnetic anomaly in the vicinity of Ice Chest Lake is therefore inter preted to be caused by mafic metavolcanics with associated mafic intrusive phases. These rocks would be of similar composition and density. Some small gravity highs may have been missed because of the wide station spacing.

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Profile 10—Deloro Township to Wark Township

Profile 10 was carried out along the Pinard power line in Deloro Township, High way 655 in the central part of the profile and the Wawaitan power line in Murphy and Wark Townships. Elevations along the power lines were known to within ± l foot (30 cm) while the elevations along the highway were known within ± 0.1 foot (3 cm). Readings were taken at the bases of the transmission line towers in the case of the Pinard line and at the bases of and in the centres between the Wawaitan line towers. The profile was not extended further north because high winds caused move ment of the transmission line which was transmitted to the ground via the towers. This problem was accentuated by the fact that the ground in Wark Township contains a higher percentage of muskeg than in Murphy Township where the overburden consists largely of sand.

The gravity profile in the Deloro portion of the traverse is underlain mainly by mafic metavolcanics with a minor felsic intrusion composed mainly of granodiorite. At Station 20630, the Destor-Porcupine Fault as projected by Carlson (1967), and Ginn et al. (1963) does not appear to influence the gravity profile to any degree since both sides of the fault have rocks of similar density. Therefore, there is no density contrast between the rocks on either side of the projected Destor-Porcupine Fault. This section of the profile demonstrates that the Destor-Porcupine Fault is not a major crustal feature and possibly may not even exist in this area. This is suggested because an uplifting of basement rocks composed either of felsic intrusive rocks such as those occurring to the southwest in the Kenogamissi Lake area, or higher density basement rocks consisting of granulite facies metavolcanics and sedimentary or mafic intrusive rocks, would have given a change in the Bouguer gravity values on one side of the fault.

In the southern Tisdale Township immediately south of Highway 101, a syncline containing metasediments and felsic pyroclastics is known to occur (Ferguson et al. 1968). The regional gravity trend over this area remains relatively constant showing that the Porcupine Syncline has not produced any large effects on the gravity field, although close readings south of Highway 101 were not taken in order to verify this. For the most part, Tisdale Township has a relatively smooth gravity profile, which may be due to a very wide station spacing. However, in the vicinity of Station 20364, located near the Tisdale-Murphy Township boundary, a zone of known metasediments and possible felsic metavolcanics is reflected in the gravity profile. In the vicinity of Station 9673, a gravity high with an amplitude of 3 milligals occurs which appears to be related to a mafic intrusion situated to the west of the gravity station. Between Station 9673 and Station 20330, a slight gravity low on the profile indicates a zone of felsic metavolcanics. North of this zone, the geology is not very well known but the increase in the gravity field suggests the presence of mafic metavolcanics. In the vicinity of Bigwater Lake, a zone of metasediments has been assumed by Ferguson (1964). However, this zone of metasediments has not influenced the gravity field significantly suggesting that it is very narrow or has the same density as the surrounding volcanic rock or is rather shallow and underlain by denser rocks.

North of Big Water Lake, the gravity values rise very rapidly. This may be caused by an increase in density of the mafic metavolcanics. Airborne magnetic data indicate an area of high magnetic relief in this region whch suggests the presence of mafic intrusive rocks. Serpentine and peridotites are known to occur in north-

22

eastern Kidd Township, extending eastward into Wark Township (George and Leahy 1968a, b). The provisional geological interpretation map given by George and Leahy (1968a, b) shows that most of the rocks underlying the gravity profile between Station 9675 and 20363 are mainly mafic metavolcanics with interbedded metasediments. However, serpentines have been intersected by diamond drilling approximately *4 mile (0.4 km) north of Station 20363.

The contoured gravity results given on map 2321 in the back of this report show that there is a regional gradient trending northeast-southwest which crosses the north end of this gravity profile. The regional gravity high located northwest of the north end of this gravity profile has been named the Kamiskotia-Kidd Gravity High since it appears to be associated with the base metal deposits in the Kamiskotia area and Kidd Township. The southeast flank of this gravity high is very distinct and follows for the most part a straight line southwestward to the Mattagami River at which point it swings southward to Bristol Township. From there, the flank of the high turns west ward to Denton Township and northwestward to Whitesides Township. In the west, the gravity high is terminated by a north-south gradient which is associated with the contact between the Abitibi Greenstone Belt to the east and felsic intrusive rocks composed of granodiorite, trondhjemite, and monzonite of unknown (Early Precambrian) age in the west.

Profile 11—Mountjoy Township to Sturgeon Falls

Profile 11 provides an excellent opportunity to locate the boundaries between a large metasedimentary zone located in Mountjoy Township and a broad area of metavolcanics located north of Mountjoy Township in Jessop, Jamieson, Macdiarmid and Reid Townships. Unfortunately, it was not possible to obtain detailed gravity readings in Jessop, Jamieson and Macdiarmid Townships. However, a series of base stations along the Sturgeon Falls power line was established.

At the extreme southern end of Profile 11, in Ogden Township, mafic metavolcanics occur. A broad area of metasedimentary rocks south of Sandy Falls is indicated by gravity readings of the order of —55 milligals. Minor variations in the gravity values south of Sandy Falls reflect narrow bands of mafic metavolcanics.

North of Sandy Falls, the gravity values increase rapidly before reaching a relatively high average level in Macdiarmid Township and further north. The steep gradient between Sandy Falls and Jamieson-Macdiarmid Township boundary is part of a regional gradient that trends northeast-southwest through Jessop to Wark Town ship. This same steep gradient is also encountered on the northern end of Profile 10 shown in Figure 12. The Kamiskotia-Kidd Gravity High which occurs north of the steep gravity gradient is interpreted to be a broad area of mafic metavolcanics with associated gabbro intrusions. This volcanic pile appears to thicken to the north which would account for the increase in the gravity values. There is a possibility that the density of these rocks also increases northward. The axis of the Kamiskotia-Kidd Gravity High taken from the contoured gravity map is in the vicinity of the Jamieson- Macdiarmid Township boundary.

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Profile 12—Highway 576-Mountjoy Township-Kamiskotia

Profile 12 was carried out making use of elevations along Highway 576 between Highways 101 and the Kam-Kotia Mine. The initial portion of the profile in Mountjoy Township reflects metasediments, however, this zone is abruptly cut off by the Matta gami River Fault which is known to extend in a north-south direction through Godfrey, Jamieson, Macdiarmid and Reid Township, Middleton (1969, 1973), Kirwan (1968). A rapid increase in the gravity values occurs west of the Mattagami River Fault reflecting the density contrast between the felsic metavolcanics and the metasediments as well as a major vertical displacement on the Mattagami River Fault. Since the density contrast between felsic metavolcanics and metasediments is in the order of 0.1 g/cm3, as determined from rock measurements, it suggested that the area west of the Mattagami River Fault is underlain by rocks of higher density than the meta sediments at some depth beneath the felsic metavolcanics.

These rocks at depth may be metamorphosed volcanic rocks having a higher density than the greenstone facies metavolcanics that occur in the Godfrey Township area. Uplifting of the western side of the Mattagami River Fault would bring these higher density rocks closer to surface and thus produce a gravity high west of the fault.

A wide area of felsic metavolcanics occurs in Godfrey Township and is reflected by a relatively smooth gravity profile with a value of around —47 milligals. The gravity values increase gently in the vicinity of Mount Jamieson and sharply over an area of mafic metavolcanics on the west side of Mount Jamieson. A small high-level quartz- porphyry intrusion occurring in southwestern Jamieson Township does not greatly affect the gravity values immediately west of the mafic metavolcanic zone and on the eastern margin of the Kamiskotia Complex. At this point, the gravity values exhibit the steepest gradient encountered in the whole gravity survey of the Timmins-Matheson area. They attain their highest level over the Kamiskotia Complex which consists of fresh, pegmatitic, and medium-grained massive phases of gabbro, norite, and gabbro- anorthosite. Mafic metavolcanics are observed on the northwest end of the gravity profile where a slight decrease in the gravity values is noted.

The sharp change in gravity readings associated with the eastern contact of the Kamiskotia Complex suggests that the contact between the gabbro-norite-quartz-porphyry intrusion and the surrounding mafic metavolcanics is nearly vertical. The fact that the dip of metavolcanics in Godfrey Township is also vertical with the top direction facing east (Middleton, in preparation) indicates that the contact between the metavolcanics and the gabbro-norite intrusion is concordant with the overlying strata. This suggests that the Kamiskotia Complex in Robb Township is a large sill-like body. Mapping in the vicinity of Kamiskotia Hill in Robb Township has shown that layers appear in the norite phases which have a top direction to the northeast toward the metavolcanic contact (Middleton 1973; Wolfe 1970). These layers have been formed by mineral segregation, leaving ilmenite, pyrite and heavy mafic minerals on the bottom and plagioclase feldspar at the top of the layers (Middleton 1973).

It is interesting to note that the Canadian Jamieson Mine and the Kam-Kotia Mine occur on the flanks of the Kamiskotia Complex, and the Kidd Creek Mine of Ecstall Mining Limited is situated on the flank of the Kidd Creek Gravity High which like the Robb Gravity High, is part of the regional Kamiskotia-Kidd Gravity High.

The densities of the rocks in the Kamiskotia Complex are of the order of 3.0 to 3.2 g/cm3 accounting for the large gravity high. These high densities are explained

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by a high ilmenite and pyrite content as well as widespread epidotization (Middleton 1973).

Profile 13—Kamiskotia Hill

A detailed gravity profile in a north-south direction was run over Kamiskotia Hill (in central Robb Township) in order to observe gravity differences in the different phases of the Kamiskotia Complex as well as to locate the northern boundary of the Kamiskotia Complex where it is in contact with mafic metavolcanics. Readings were taken at 100-foot (30 m) intervals along a base line cut by the field party over Kamiskotia Hill. Spirit levelling was carried out to establish the elevations of each station tying them to an elevation datum on Highway 576. The rugged topography on Kamiskotia Hill made it difficult to carry out the spirit levelling.

It was suggested by Berry (1944) that the Kamiskotia Complex was a lopolith. Ground magnetic surveys completed in Robb Township (Middleton 1970) have not been able to define the northern boundary of the gabbro-norite intrusion, although various magnetic phases were outlined by the magnetometer survey.

The gravity values over the Kamiskotia Complex are relatively uniform with the exception of two stations, Nos. 20488 and 20489- It is, therefore, apparent that the high density is common throughout the complex and is not directly related to magnetic susceptibility changes which have been observed (Middleton 1973).

The sharp increase in gravity values at stations 20488 and 20489 is of the order of 4 milligals. This anomaly would have to be explained by a localized increase in density in the norite since instrumental problems have been discounted as the source of the anomaly. A local concentration of ilmenite and pyrite would account for a large increase in density.

The contact between the Kamiskotia Complex and the mafic metavolcanics is interpreted to occur between station 20196 and 20207 at a point where there is a rapid decrease in the gravity values northward. This sharp drop suggests that the contact is almost vertical or slightly inclined northward. The density contrast between the gabbro-norite and the mafic metavolcanics is about 0.1-0.15 g/cm3 and more, explaining the minor change in gravity over the contact between the two rock types.

The slight decrease in gravity toward the south end of the profile may be explained by the fact that a large granodiorite intrusion in central Robb Township occurs west of the south end of the profile line (Middleton 1973).

Profile 14—Mallette Lumber Road-Denton Township to Cote Township

The purpose of Profile 14 was to gather further information on the location of the Kamiskotia Complex and to delineate the occurrence of felsic intrusions on the margin of the complex.

On the southern portion of the profile, a felsic intrusion known as the Jowsey Lake granite has been outlined. Gravity values of the order of —46 milligals are asso ciated with this intrusive. The southern and northern margins of the intrusion consist mainly of mafic metavolcanics, giving a density contrast between the two rock types of 0.2 grams per cubic centimetre. The contact between the granite and the country

25


rock is essentially vertical on the south side, and may be slightly inclined southward in the north. Considering the profile over the northern contact, a gravity low of 12 milligals can be assumed. Using the formula for a buried sphere (Dobrin I960) as given in the interpretation of Profile l, the depth of the felsic intrusion is calculated to be 6,000 feet (1,800 m) to the top of the sphere or 12,350 feet (3,764 m) to the bottom of the sphere.

With the formula given by Nettleton (1971) for an infinite slab, also given in the interpretation of Profile l, the depth extent is calculated to be 4,700 feet (1,430 m), assuming a density contrast of 0.2 g/cm3 and A gMax ^ 12 milligals as in the previous calculation. Since the geology of the area cannot be approximated by an infinite slab because there is a finite width to the felsic intrusion, the depth extent determined by the sphere model gives a rough order of magnitude value. This model would tend to give too great a depth because the material overlying the sphere is assumed to be a country rock of higher density which is not the case. The depth is, therefore, likely to be somewhere between 6,000 feet and 12,300 feet (1,800 m and 3,750 m).

The mafic metavolcanics occurring north of the Jowsey Lake felsic intrusion are not very well defined by the gravity profile since the Kamiskotia Complex occurs immedi ately north of them. The gravity values over the Massey and northern Whitesides Township area are about 5 milligals lower than those obtained in Profile 13 (Robb Gravity High) suggesting that the gabbroic intrusive rocks in the Whitesides-Massey Township area have a slightly lower density than rocks of similar character in Robb Township. It may also be possible that the depth extent of the gabbro in the vicinity of Profile 14 is less than the one of the gabbro-norite in Robb Township. In the vicinity of a point halfway between station 20073 and 20620 the gabbro rocks are in contact with another felsic intrusion in northern Massey Township and southern Cote Township. This intrusion is known to occur in northwestern Turnbull Township where it has been mapped by a ground magnetic survey (Middleton 1971). The gravity values over this felsic intrusion, composed of granodiorite, show that there is less density contrast between this intrusion and the surrounding mafic intrusive rocks than in the case of the Jowsey Lake granite. Although there is a gravity low of the order of -11 milligals associated with this felsic intrusion the change in gravity could be much greater, as the surrounding mafic rocks have densities of the order of 3.0 to 3.1 g/cnr'. The northern contact of the felsic intrusion with the Kamiskotia Complex (Robb Gravity High) appears to be vertical as indicated by a high gravity gradient over it. The southern contact of this intrusion is not very well defined because of the low density of readings.

The gravity values over the Kamiskotia Complex in Cote Township in the vicinity of Winter Lake are similar to those obtained in Robb Township in the Kamiskotia Hill area. According to the gravity contour map, they are part of the same gravity high (Robb). Magnetic surveys, (Middleton 1970) have indicated that the Kamiskotia Complex extends from Robb Township beneath the Winter Lake region westward into Cote Township.

Profile 15—Highway 101-Hoyle to Munro Township

The results of gravity readings taken along Highway 101 from west to east between Hoyle Township and Munro Township are presented in Figure 17. The

26

purpose of the profile was to try to identify north-north west trending faults that were suspected to occur in the region. On the western portion of the profile, the gravity readings reflect a zone of metasediments. East of Highway 67, the gravity values increase over a large area of mafic metavolcanics. The Destor-Porcupine Fault is shown on the geological section beneath the gravity profile at a point where it has been compiled by Ginn et al. (1963). In the vicinity of Highway 67 a north-northwest trending fault has been interpreted. This interpretation is based on the sharp increase in the gravity values at this point and a north-northwest striking fault that appears to terminate the metasedimentary zone east of Highway 67. This fault is likely to account for the direction of the western shore of Frederick House Lake.

Since the gravity profile cuts the Destor-Porcupine Fault obliquely, a geological model of an infinite slab would be realistic to use in calculating the depth of sediments. Employing a density contrast of 0.2 g/cnr* between the metasediments and the mafic metavolcanics and a total gravity difference of 21 milligals, a depth of sediments of 8,240 feet (2,512 m) is determined. East of Matheson, the Destor-Porcupine Fault again appears in the section. At this point, the Destor-Porcupine Fault is intersected by the Hislop Fault thus making it difficult to determine the effect of either fault. East of this point, the gravity readings reflect the metasediments that occur in north eastern Hislop Township, central Beatty Township, southwestern Munro Township and northwestern Guibord Township.

The block fault discussed earlier under the description of Profile 5 does not appear to be as well defined in this profile as it is outlined by the contour presentation. In this profile, the Black River Fault is traversed near Matheson where rocks of similar density occur on either side of the fault. However, there does appear to be a gravity low \Vi miles (2.6 km) west of Matheson which correlates with an area of known felsic intrusives. It is possible that the block between the Black River Fault and the Hislop Fault has not been uplifted greatly. This would explain why the gravity profile in the area where the Black River Fault is bounded by mafic metavolcanics on both sides (at Matheson) does not have the same aspect as north of Matheson in eastern Carr Town ship where mafic metavolcanics beneath the metasediments have been uplifted creating a density contrast in the basement.

Recommendations to Prospectors

The gravity results have outlined regions of different rock types and structures which can be related to mineral deposits. For instance, the Tisdale metavolcanics with asso ciated felsic intrusive rocks and numerous gold deposits can be extrapolated westward to the Mattagami River Fault.

The Kamiskotia-Kidd Gravity High, which extends southwest-northeast from White sides Township to Hanna Township, outlines an area of favourable metavolcanic-intrusive centres for base metal exploration. The Abitibi River gravity high extending east of Ansonville may also reflect undiscovered intrusive centres. This Gravity High on first inspection appears to be associated with an extensive accumulation of mafic to inter mediate metavolcanics mapped by Simony (1965).

The Matheson metavolcanics that occur parallel to and on the south side of the Destor-Porcupine Fault show promise of having gold deposits associated with them (Northern Miner 1973). It has been demonstrated by this gravity survey that these

27


rocks extend from Matheson to the Nighthawk Lake area, and possibly join the metavolcanics in the vicinity of Argyle Township in the south-central part of the survey area.

Gravity has been demonstrated to be a useful tool for mapping different rock types covered by overburden that cannot be mapped by any other geophysical means. In many areas, rocks do not have magnetic susceptibility contrasts (Middleton 1973) that would make it possible to use magnetic surveys for mapping. Density contrasts appear to be more common between many rock types. This is evident by comparing the specific gravity data given in Table l with magnetic susceptibility results (Middleton 1973; Moon 1972). On properties where the location of geological contacts or intru sions is critical such as in many base metal or gold prospecting situations, gravity may be a valuable geological aid. Gravity is often useful in locating and identifying massive sulphide bodies as a follow-up to electromagnetic, induced polarization and resistivity surveys. Conductive graphitic horizons can often be distinguished from sulphide zones owing to the density contrast with the country rock. In ideal situations, tonnages (mass excess) of massive sulphide or oxide deposits can be estimated from the gravity results.

In a specialized application, it may be possible to observe density changes in rocks that are due to pyritization and carbonatization. Thus gravity may be valuable in complementing induced polarization in gold exploration in the area. Collection of specific gravity data as core samples in a drill programme may provide the basis for a numerical technique of mapping alteration zones.

It may be noted, however, that depth of overburden should be considered when dealing with the above exploration situations. Newton's Law clearly shows that if the distance between the gravimeter and the body that is to be measured is increased, the force of gravity is decreased at a rate which is a function of the square of the distance.

28

REFERENCES CITED

Berry, L.G.1944: Geology of the Robb-Jarnieson Area; Ontario Dept. Mines, Vol.53, pt.4, p.1-16

(published 1946). Accompanied by Map 53c, scale l inch to Vz mile.

Bowie, W.1931: Isostasy, "The Figure of the Earth", p. 113, Physics of the Earth Series 2,

National Research Council Bulletin 78.

Carlson, H.D.1966: Deloro Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.342, scale l inch to V* mile. Geology 1964, 1965. Re-issued 1967 with corrections and additions.

Dobrin, M.B.1960: Introduction to Geophysical Prospecting; McGraw-Hill Book Co., New York,

Toronto, London, Second Edition, 446p.

Dominion Observatories Branch1966: Timmins-Senneterre, Quebec-Ontario; Canada Dept. Energy, Mines and Re

sources, Observatories Branch, Gravity Map Series No.58, scale 1:500,000. 1967: Bouguer Gravity Anomaly Map of Canada; Canada Dept. Energy, Mines and

Resources, Observatories Branch, Map CMC 67-1, scale l inch to 40 miles.

Ferguson, S.A.1964: Murphy Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.255, scale l inch to V* mile. Geology and Geophysics 1964.

Garland, G.D.1950: Interpretations of Gravimetric and Magnetic Anomalies on Traverses in the

Canadian Shield in Northern Ontario; Dominion Observatories Publication, Vol.26, No.l.

George, P.T. and Leahy, E.J.1968a: Wark Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. Map

No.P.478, Timmins Data Series, scale l inch to V4 mile. Compilation 1968. 1968b: Kidd Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. Map

No.P.486, Timmins Data Series, scale l inch to JA mile. Compilation 1968.

Gibb, R.A.1968: The Densities of Precambrian Rocks From Northern Manitoba; Canadian J.

Earth Sci., Vol.5, No.3, p.433-438.

Gibb, R.A. and van Boeckel, J.1970: Three-Dimensional Gravity Interpretations of the Round Lake Batholith, North

eastern Ontario; Canadian J. Earth Sci., Vol.7, No.l, p.156-163.

Ginn, R.M., Savage, W.S., Thomson, R., Thomson, J.E., and Fenwick, K.G.1964: Timmins-Kirkland Lake Sheet, Cochrane, Sudbury and Timiskaming Districts;

Ontario Dept. Mines, Map 2046, Geol. Comp. Ser., scale l inch to 4 miles. Geological Compilation 1961, 1962.

Grant, F.S. and West, G.F.1965: Interpretation Theory in Applied Geophysics, McGraw-Hill, Toronto.

Kirwan, J.L.1968: Geological History of the Precambrian Rocks in Parts of the Porcupine Mining

Area, Canada; Unpublished Ph.D. Thesis, University of London, U.K.

Lovell, H.L., and Caine, T.W.1970: Lake Timiskaming Rift Valley; Ontario Dept. Mines, MP39, 16p.

29


Middleton, R.S.1969: Jamieson Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map

No.P.521, Geoph. Ser., scale l inch to V4 mile. Survey and Compilations 1968.1970: Robb Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map

No.P.598, Geoph. Ser., scale l inch to V* mile. 'Survey and Compilation 1968, 1969.

1971: Ground Vertical Field Magnetics, Turnbull Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim Map P.638, Geoph. Ser., scale l inch to V* mile. Survey and Compilation 1969, 1970.

1972: Gravity Control Network in the Timmins, Matheson and Cobalt Areas, Districts Cochrane and Timiskaming; Ontario Dept. Mines and Northern Affairs, OFR 5071, 106p., l table, 95 figures, 85 photos.

1973: Magnetic Survey of Robb and Jamieson Townships, District of Cochrane; On tario Div. Mines, GPR1, 56p. Accompanied by Map 2255, scale l inch to Vz mile,

In preparationA Geophysical and Geological Survey of Godfrey and TuTnbuU Townships, Dis

trict of Cochrane; Ontario Div. Mines.Moon, W.

1972: Magnetic Report on Eldorado and Langmuir Townships, District of Timiskaming; Ontario Div. Mines, OFR 5085, 85p., 4 tables, 35 figures, l photo. Accom panied by 2 maps, scale l inch to ^4 mile.

Nettleton, L.L.1942: Gravity and Magnetic Calculations; Geophysics, Vol.7, p.293-310. 1971: Elementary Gravity and Magnetics for Geologists and Seismologists, Society of

Exploration Geophysicists, Monograph Series Number 1.

Northern Miner1973: Quebec Sturgeon Plans Underground For Porcupine Area Gold Group (article);

The Northern Miner, Vol.59, No.28, September 27, 1973, p.l, 6.

ODM-GSC1964: Kamiskotia Lake, Cochrane District, Ontario; Ontario Dept. Mines-Geol. Surv.

Canada, Aeromagnetic Map 2300G, scale l inch to l mile. Survey May 1963to April 1964.

1970a: Porquis Junction, Cochrane District, Ontario; Ontario Dept. Mines-Geol. Surv.Canada, Aeromagnetic Map 297G (Revised), scale l inch to l mile. Survey1947, 1948, 1949.

1970b: Timmins, Cochrane, Timiskaming, and Sudbury Districts, Ontario; Ontario Dept.Mines-Geol. Surv. Canada, Aeromagnetic Map 7085G, scale l inch to 4miles. Survey 1947, 1948, 1949.

ODMNA1971a: Aeromagnetic Survey, Total Intensity Contours, Hislop Township, District of

Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.645,scale l inch to V* mile. Compilation 1970.

1971b: Helicopter Radiophase Survey, In-Line In-Phase Contours, Hislop Township,District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim.Map No.P.663, scale l inch to V\ mile. Survey 1970.

1971c: Helicopter Radiophase Survey, In-Line In-Phase Contours, Munro Township,District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim.Map No.P.662, scale l inch to V4 mile. Survey 1970.

1971d: Helicopter Radiophase Survey, In-Line In-Phase Contours, Guibord Township,District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim.Map No.P.664, scale l inch to Vi mile. Survey 1970.

Parkinson, R.N.1962: Operation Overthrust; p.90-101 in The Tectonics of the Canadian Shield, Roy.

Soc. Canada, Special Publ. No.4, 180p.

30

Prest, V.K.1951: Geology of Guibord Township; Ontario Dept. Mines, Vol.60, pt.9, 56p. (pub

lished 1953). Accompanied by Map No.1951-6, scale l inch to 1,000 feet.1956: Geology of Hislop Township; Ontario Dept. Mines, Vol.65, pt.5, 51p. (pub

lished 1957). Accompanied by Map No. 1955-5, scale l inch to 1,000 feet.Pyke, D.R., Ayres, L.D., and Innes, D.G.

1973: Timmins-Kirkland Lake, Cochrane, Sudbury and Timiskaming Districts; Ontario Div. Mines, Map 2205, Geol. Comp. Ser., scale l inch to 4 mile's. Geological Compilation 1970, 1971.

Satterly, J.1959: Stock Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map

No.P.38, scale l inch to V4 mile. Compilation 1959.

Serviss, R.W.1959: Precise and Secondary Levelling in Ontario, North of Parry Sound; Geodetic

Survey of Canada, Publication 20.

Simony, P.S.1965: Geology of Rickard, Knox and Kerrs Townships, District of Cochrane; Ontario

Dept. Mines, GR37, 25p. Accompanied by Map No.2073, scale l inch toVz mile.

Tanner, J.G. and Buck, R.J.1964: A Computer-Oriented System for the Reduction of Gravity Data; Canada Dept.

Mines and Technical Surveys, Dominion Observatory Publication, Vol.31,No.3, p.57-65.

Winter, P.J.1967: Description of Gravity Control Stations, N.T.S. 42; Unpublished Booklet, Gravity

Division, Earth Physics Branch, Department of Energy, Mines and Resources,Ottawa.

Winter, P.J. and Perrier, J.A.1968: Description of Gravity Control Stations, N.T.S. 31; Unpublished Booklet, Gravity

Division, Earth Physics Branch, Department of Energy, Mines and Resources, Ottawa.

Wolfe, A.1940: Tidal Force Observation; Geophysics, Vol.5, p.317-320.

Wolfe, W.J.1970: Distribution of Copper, Nickel, Cobalt and Sulphur in Mafic Intrusive Rocks

of the Kamiskotia-Whitesides Area, District of Cochrane; Ontario Dept. of Mines and Northern Affairs, MP44, 28p.

SEE FOLLOWING PAGES FOR SELECTED BIBLIOGRAPHY

31


SELECTED BIBLIOGRAPHY

Berry, L.G.1939: Geology of the Bigwater Lake Area; Ontario Dept. Mines, Vol.48, pt.12, lip.

(published 1941). Accompanied by Map 48n, scale l inch to l mile.Berry, L.G., and Ferguson, S.A.

1959a: Robb Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map P.19,scale l inch to V4 mile. Geology by L.G. Berry, 1944; compiled by S.A.Ferguson, 1957.

1959b: Jamieson Township, District of Cochrane; Ontario Dept. Mines, Prelim. MapP.20, scale l inch to V* mile. Geology by L.G. Berry, 1944; compiled by S.A.Ferguson, 1957.

1959c: Loveland Township, District of Cochrane; Ontario Dept. Mines, Prelim. MapP.25, scale l inch to V* mile. Geology by L.G. Berry, 1944; compiled by S.A.Ferguson, 1957.

1959d: Macdiarmid Township, District of Cochrane; Ontario Dept. Mines, Prelim.Map P.26, scale l inch to V* mile. Geology by L.G. Berry, 1944; compiledby S.A. Ferguson, 1957.

1959e: Denton Township, District of Timiskaming; Ontario Dept. Mines, Prelim. MapP.28, scale l inch to V4 mile. Geology by L.G. Berry, 1938, compiled byS.A. Ferguson, 1957.

Berry, L.G., Ferguson, S.A. and Rogers, D.P.1959: Keefer Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Map

P.27, scale l inch to V4 mile. Geology by L.G. Berry, 1938; compiled by S.A. Ferguson and D.P. Rogers, 1957.

Bhattacharyya, B.K.1971: An Automatic Method by Compilation and Mapping of High-Resolution Aero

magnetic Data; Geophysics, Vol.36, No.4, p.695-716.

Bright, E.G.1968a: Beemer Township, District of Sudbury; Ontario Dept. Mines, Prelim. Geol. Map

No.P.453, scale l inch to V4 mile. Geology 1967. 1968b: English Township, District of Sudbury; Ontario Dept. Mines, Prelim. Geol.

Map No.P.454, scale l inch to V4 mile. Geology 1967. 1968c: Zavitz Township, District of Sudbury; Ontario Dept. Mines, Prelim. Geol. Map

No.P.455, scale l inch to V4 mile. Geology 1967. 1968d: Semple Township, District of Sudbury; Ontario Dept. Mines, Prelim. Geol. Map

No.P.490, scale l inch to V* mile. Geology 1968. 1968e: Hutt Township, District of Sudbury; Ontario Dept. Mines, Prelim. Geol. Map

No.P.491, scale l inch to V4 mile. Geology 1968.

Bright, E.G., and Hunt D.S.1971a: Pamour Sheet, District of Cochrane; Ontario Dept. Mines and Northern Affairs,

Prelim. Map P.698, Geol. Comp. Ser., scale l inch to 2 miles. 1971b: Tully Township, District of Cochrane); Ontario Dept. Mines and Northern

Affairs, Prelim. Map P.699, Timmins Data Series, scale l inch to V* mile. 1971c: Reid Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs,

Prelim. Map P.700, Timmins Data Series, scale l inch to *X4 mile. 1972a: Duff Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs,

Prelim. Map P.728, Timmins Data Series, scale l inch to V4 mile. Data com piled 1971.

1972b: Gowan Township, District of Cochrane; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.729, Timmins Data Series, scale l inch to V* mile.Data compiled 1971.

1972c: Macdiarmid Township, District of Cochrane; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.730, Timmins Data Series, scale l inch to V* mile.Data compiled 1971.

32

1972d: Geary Township, District of Cochrane; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.739, Timmins Data Series, scale l inch to V* mile.Data compiled 1971.

1972e: Mahaffy Township, District of Cochrane; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.740, Timmins Data Series, scale l inch to Vi mile.Data compiled 1971.

1972f: Thorburn Township, District of Cochrane; Ontario Div. Mines, Prelim. MapP.754, Timmins Data Series, scale l inch to ^4 mile. Data compiled 1971.

1972g: Mann Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.755,Timmins Data Series, scale l inch to *fa mile. Data compiled 1971.

1972h: Reaume Township, District of Cochrane; Ontario Div. Mines, Prelim. MapP.767, Timmins Data Series, scale l inch to V* mile. Data compiled 1971.

Burrows, A.G.1912: The Porcupine Gold Area, Second Report; Ontario Bur. Mines, Vol.21, pt.l,

tp.205-249. Accompanied by Map 21a, scale l inch to l mile. 1915: The Porcupine Gold Area (Third Report); Ontario Bur. Mines, Vol.24, pt.3,

p. 1-57. Accompanied by Map 24d, scale l inch to 2,000 feet, and Map 24e,scale l inch to 1,000 feet.

1924: The Porcupine Gold Area; Ontario Dept. Mines, Vol. 33, pt.2, p. 1-84 (published1925). Accompanied by Map 33a, scale l inch to 2,000 feet.

Carlson, H.D.1963: Geology along the Route of Highway No. 101 between Timmins and Chapleau;

Districts of Cochrane, Timisfcaming and Sudbury; Ontario Dept. Mines, Pre lim. Geol. Map No.P.194, scale l inch to 2 miles. Geology 19©3.

1965a: Dundonald Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.307, scale l inch to V4 mile. Geology by R.M. Ginn 1959-1961 andcompilation by H.D. Carlson 1965. Supersedes P. 17.

1965b: Clergue Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.308, scale l inch to V4 mile. Geology by, R.M. Ginn 1958-1961 andcompilation by H.D. Carlson 1965. Supersedes P. 18.

1966a: Ogden Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. MapNo.P.341, scale l inch to V* mile. Re-issued 1967 with correlation andadditions.

1966b: Shaw Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. MapNo.P.343, scale l inch to Vt mile. Re-issued 1967 with correlations andadditions.

1967: Geology of Ogden, Deloro and Shaw Township, District of Cochrane; OntarioDept. Mines, OFR5012, 124p. Accompanied by Map Nos.P.341, 342, andP.343, scale l inch to V4 mile.

Ferguson, 1944

S.A.Some Copper Properties in Robb, Jamieson and Godfrey Townships; Ontario

Dept. Mines, Vol.53, pt.4, p.17-29 (published 1946). Accompanied by Map No.53c, scale l inch to Vz mile.

1957: Geology of Bristol Township; Ontario Dept. Mines, Vol.66, pt.7, p.1-42 (pub lished 1959). Accompanied by Map 1957-7, scale l inch to 1,000 feet.

1959a: Whitney Township, Northwest Quarter, District of Cochrane, Ontario Dept. Mines, Prelim. Map P.9, scale l inch to 500 feet. Geology 1958.

1959b: Whitney Township, Northeast Quarter, District of Cochrane, Ontario Dept. Mines, Prelim. Map P. 10, scale l inch to 500 feet. Geology 1958.

1959c: Deloro Township, Northwest Quarter, District of Cochrane, Ontario Dept. Mines, Prelim. Map P.ll, scale l inch to 500 feet. Geology 1958.

1959d: Deloro Township, Northeast Quarter, District of Cochrane, Ontario Dept. Mines, Prelim. Map P.12, scale l inch to 500 feet. Geology 1958.

1960a: Tisdale Township, Southwest Quarter, District of Cochrane, Ontario Dept. Mines, Prelim. Map No.P.7 (Revised), scale l inch to 500 feet. Geology and geophysics 1957, 1958, revised 1960.

33


1960b: Tisdale Township, Southeast Quarter, District of Cochrane. Ontario Dept. Mines,Prelim. Map No.P.8 (Revised), scale l inch to 500 feet. Geology and geophysics1957, 1958, revised 1960.

1961a: Tisdale Township, Southwest Quarter, District of Cochrane, Subsurface No.l;Ontario Dept. Mines, Prelim. Geol. Map No.P.106, scale l inch to 500 feet.Geology compiled 1960, 1961, revised 1968, re-issued 1969.

1961b: Tisdale Township, Southwest Quarter, District of Cochrane, Subsurface No.2;Ontario Dept. Mines, Prelim. Geol. Map No.P. 107, scale l inch to 500 feet.Geology compiled 1960, 1961, revised 1968, re-issued 1969.

1961c: Tisdale Township, Southwest Quarter, District of Cochrane, Subsurface No.3;Ontario Dept. Mines, Prelim. Geol. Map No.P.108, scale l inch to 500 feet.Geology compiled 1960, 1961, revised 1968, re-issued 1969.

1961d: Tisdale Township, Southeast Quarter, District of Cochrane, Subsurface No.l;Ontario Dept. Mines, Prelim. Geol. Map No.P.109, scale l inch to 500 feet.Geology compiled 1960, revised 1968, re-issued 1969.

1961e: Tisdale Township, Southeast Quarter, District of Cochrane, Subsurface No.2;Ontario Dept. Mines, Prelim. Geol. Map No.P.110, scale l inch to 500 feet.Geology compiled 1960, revised 1968, re-issued 1969.

1961f: Tisdale Township, Southeast Quarter, District of Cochrane, Subsurface No.3;Ontario Dept. Mines, Prelim. Geol. Map No.P.lll, scale l inch to 500 feet.Geology compiled 1960, revised 1968, re-issued 1969.

1961g: Tisdale Township, Part of South Half, District of Cochrane, Subsurface No.4;Ontario Dept. Mines, Prelim. Geol. Map No.P.112, scale l inch to 500 feet.Geology compiled 1960, 1961, revised 1968, re-issued 1969.

1963a: Sections of Broulan Reef Mines Ltd., Consolidated Gillies Lake Mines Ltd.,Moneta Porcupine Mines Ltd., Hollinger Consolidated Gold Mines Ltd., andPorcupine Goldtop Mines Ltd., Tisdale Township, District of Cochrane;Ontario Dept. Mines, Prelim. Map No.P.171, scale l inch to 500 feet.Compiled 1962.

1963b: Sections of Goldale Mines Ltd., Mcintyre Porcupine Mines Ltd., HollingerConsolidated Gold Mines Ltd., Carium Mines Ltd., Kayorum Gold Mines Ltd.,and Fuller Claim, Tisdale Township, District of Cochrane; Ontario Dept.Mines, Prelim. Map P. 172, scale l inch to 500 feet. Compiled 1962.

1963c: Sections of Paymaster Consolidated Mines Ltd., Dome Mines Ltd., Cincinnati- Porcupine Mines Ltd., and Preston Mines Ltd., Tisdale Township, District ofCochrane; Ontario Dept. Mines, Prelim. Map No. P. 173, scale l inch to 500feet. Compiled 1962.

1968: Geology and Ore Deposits in Tisdale Township, District of Cochrane; OntarioDept. Mines, GR58, 177p. Accompanied by Map 2075, scale l inch to 1,000feet.

Ferguson, S.A. and Barnby, J.S.1959a: Tisdale Township, Northwest Quarter, District of Cochrane, Ontario Dept. Mines,

Prelim. Map No.P.5, scale l inch to 500 feet. Geology and geophysics 1956,1957.

1959b: Tisdale Township, Northeast Quarter, District of Cochrane; Ontario Dept.Mines, Prelim. Map P.6, scale l inch to 500 feet. Geology and geophysics1956, 1957.

Ferguson, S.A. and Rogers, D.P.1959: Ogden Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map P.24,

scale l inch to V* mile. Geology by J.E. Hawley, 1926; M.E. Hurst, 1938; •compiled by S.A. Ferguson and D.P. Rogers, 1957.

Finley, F.L. 1924:

34

Kamiskotia Gold Area (District of Cochrane); Ontario Dept. Mines, Vol.34, pt.6, p.43-64. Accompanied by map 34f; scale l inch to 60 chains.

Finley, F.L., and Ferguson, S.A.1959: Turnbull Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map

P.21, scale l inch to Vi mile. Geology by F.L. Finley, 1925; compiled by S.A. Ferguson, 1957.

George, P.T., and Leahy, E.J.1967: The Timmins Area, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.425, scale l inch to l mile. Compilation 1967.

Ginn, R.M.1961: Tisdale Township, District of Cochrane, Stratigraphic Correlation of the Sections

of the Tisdale Group; Ontario Dept. Mines, Prelim. Map P.113. Compiled1960.

1962a: Aurora Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.152, scale l inch to V4 mile. Geology 1961.

1962b: Edwards Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.153, scale l inch to V4 mile. Geology 1961.

1962c: Calvert Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.154, scale l inch to V4 mile. Geology 1961.

1962d: Teefy Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. MapNo.P.155, scale l inch to V4 mile. Geology 1961.

1962e: Jessop Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.158, scale l inch to V4 mile. Geology 1960.

Ginn, R.M., and Carlson, H.D.1965a: Dundonald Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No. P.307, scale l inch to V* mile. Rock exposures mapped by R.M. Ginn, 1959-1961, map compilation by H.D. Carlson, 1965. Map P.307 supersedes Map P. 17.

1965b: Clergue Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. Map No.P.308, scale l inch to ^4 mile. Rock exposures mapped by R.M. Ginn, 1959-1961; map compilation by H.D. Carlson, 1965. Map P.308 supersedes Map P. 18.

Ginn, R.M., and Fenwick, K.G.1962a: Pamour Sheet, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. Map

No.P.139, scale l inch to 2 miles. Geological compilation 1961-2.1962b: Iroquois Falls-Lake Abitibi Sheet, District of Cochrane; Ontario Dept. Mines,

Prelim. Geol. Map No.P.140, scale l inch to 2 miles. Geological compilation 1961-2.

1962c: Timmins Sheet, Districts of Sudbury, Timiskaming and Cochrane; Ontario Dept. Mines, Prelim. Geol. Map No.P.141, scale l inch to 2 miles. Geological com pilation 1961-2.

Ginn, R.M., and Leahy, EJ.1961: Cote-Eldorado Sheet, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.118, scale l inch to l mile. Compilation 1961. 1962: Hanna-Coulson Sheet, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No. P. 132, scale l inch to l mile. Geology 1961.

Ginn, R.M., Leahy, E.J. and Savage, W.S.1961a: Munro-Pontiac Sheet, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.120, scale l inch to l mile. Compiled 1961. 1961b: 'Matheson-Black Sheet, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.119, scale l inch to l mile. Geology 1961.

Gledhill, T.L.1925: Lightning River Gold Area (District of Cochrane); Ontario Dept. Mines, Vol.34,

pt.6, p.86-98. Accompanied by Map No.34a, scale l inch to l mile.1928: Benn Nevis, Munro, Kamiskotia, and Other Base Metal Areas, District of Coch

rane and Timiskaming; Ontario Dept. Mines, Vol.37, pt.3, p. 1-52 (published 1929). Accompanied by Map No.37g, scale l inch to l mile.

35


Graham, A.R.1931: Groundhog-Kamiskotia Area, District of Cochrane; Ontario Dept. Mines, Vol.40,

pt.3, p.23-37. Accompanied by Map 40c, scale l inch to 2 miles.

Grant, J.A.1963a: 'Bompas Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.185, scale l inch to V* mile. Geology 1963. 1963b: Grenfell Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.186, scale l inch to V4 mile. Geology 1962. 1964: Geology of Bompas and Grenfell Townships, District of Timiskaming; Ontario

Dept. Mines, GR30, 17p. Accompanied by Map 2060, scale l inch to ^ mile.

Harding, W.D., and Ferguson, S.A.1959a: Thorneloe Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Map

'P.29, scale l inch to V4 mile. Geology by W.D. Harding, 1938; compiled byS.A. Ferguson, 1957.

1959b: Price Township, District of Timiskaming; Ontario Dept. Mines, Prelim. MapP.30, scale l inch to V4 mile. Geology by W.D. Harding, 1938; compiled byS.A. Ferguson, 1957.

Hawley, J.E.1926: Geology of Ogden, Bristol, and Carscallen Townships, Cochrane District; Ontario

Dept. Mines, Vol.35, pt.6, p.1-36 (published 1927). Accompanied by Map No.35g, scale l inch to ^ mile.

Hawley, J.E,, and Ferguson, S.A.1959: Carscallen Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map

P.23, scale l inch to V4 mile. Geology by J.E. Hawley, 1938; compiled by S.A. Ferguson, 1957.

Hogg, N.1954: Geology of Godfrey Township; Ontario Dept. Mines, Vol.63, pt.7, 55p.

Accompanied by Map No.1954-4, scale l inch to 1,000 feet.

Hopkins, P.E.1915: The Beatty-Munro Gold Area; Ontario Bur. Mines, Vol.24, pt.l, p.171-184.

Accompanied by Map No.24a, scale l inch to l mile.

Hurst, M.E., and Ferguson, S.A.1959: Mountjoy Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map

P.22, scale l inch to V4 mile. Geology by M.E. Hurst, 1938, compiled by S.A. Ferguson, 1957.

Jensen, L.S. 1969a:

1969b:

Laird, H.C. 1931:

Leahy, E.J. 1963a:

1963b:

1965:

1968a:

Melba Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.Map No.P.519, scale l inch to Y* mile. Geology 1968.

Bisley Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.Map No.P.520, scale l inch to V4 mile. Geology 1968.

German-Currie Area, District of Cochrane; Ontario Dept. Mines, Vol.40, pt.3, p.1-22. Accompanied by Map No.40b, scale l inch to l mile.

Currie Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. MapNo.P.204, scale l inch to V* mile. Geology, 1962, 1963.

Bowman Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.205, scale l inch to V4 mile. Geology 1963.

Geology of Currie and Bowman Townships, District of Cochrane; Ontario Dept.Mines, GR40, 22p. Accompanied by Map No.2071, scale l inch to ^ mile.

Crawford Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.487, Timmins Data Series, scale l inch to ^4 mile. Compilation1968.

36

1968b: Whitesides Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.488, Timmins Data Series, scale l inch to Vi mile. Compilation 1968.

1969a: Cody Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. MapNo.P.545, scale l inch to Vi mile. Geology 1964 to 1968.

1969b: Macklem Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.546; scale l inch to Vi mile. Geology 1964 to 1968.

1969c: Thomas Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.Map No.P.547, scale l inch to Vi mile. Geology 1964 to 1968.

1971: Geology of the Night Hawk Lake Area, District of Cochrane; Ontario Dept.Mines and Northern Affairs, GR96, 74p. Accompanied by Map 2222, scale linch to Vi mile.

Leahy, E.J., and Ginn, R.M.1962a: Wilkie Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.156, scale l inch to Vi mile. Geology 1961. 1962b: Coulson Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.157, scale l inch to Vi mile. Geology 1961.

Leahy, E.J., and Hogg, D.W.1962: Bond Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. Map

No.P.161, scale l inch to Vi mile. Geology 1962.

Leahy, E.J., and Wares, R.1966: Carman Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.356, scale l inch to Vi mile. Geology 1965.

Lovell, H.L.1963a: Baden Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.195, scale l inch to V* mile. Geology 1963. 1963b: Alma Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.196, scale l inch to Vi mile. Geology 1963. 1966a: Tolstoi Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.327, scale l inch to V* mile. Geology 1965. 1966b: Black Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.328, scale l inch to Vi mile. Geology 1965. 1966c: Benoit Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.329, scale l inch to Vi mile. Geology 1965. 1966d: Terry Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.365, scale l inch to Vi mile. Geology 1966. 1967a: Lee Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

No.P.389, scale l inch to V* mile. Geology 1966. 1967b: Maisonville Township, District of Timiskaming; Ontario Dept. Mines, Prelim.

Geol. Map No.P.409, scale l inch to Vi mile. Geology 1966. 1967c: Geology of the Matachewan Area, District of Timiskaming; Ontario Dept. Mines,

GR51, 61p. Accompanied by Maps 2109 and 2110, scale l inch to Vfe mile. 1971: Geology of the Bourkes Area, District of Timiskaming; Ontario Dept. Mines and

Northern Affairs, GR92, 37p. Accompanied by Maps 2213, 2214, and 2215,scale l inch to Vfe mile.

1972a: Kerrs Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.773,Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1971.

1972b: Galna Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.774,Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1971.

1972c: Warden Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.775,Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1971.

1972d: Geology of the Eby and Otto Area, District of Timiskaming; Ontario Dept. Minesand Northern Affairs, GR99, 34p. Accompanied by Map 2239, scale l inchto Vz mile.

37


Lovell, H.L., and Frey, E.D.1972a: Sherring Township, District of Cochrane, Ontario Div. Mines, Prelim. Map P.778,

Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1972. 1972b: Findlay Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.779,

Kirkland Lake Data Series; scale l inch to Vi mile. Compiled 1972. 1973a: Rand Township and Indian Reserve 70, District of Cochrane; Ontario Div.

Mines, Prelim. Map P.821, Kirkland Lake Data Series, scale l inch to Vi mile.Compiled 1972.

1973b: McCool Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.822,Kirkland Lake Data Series, scale l inch to V* mile. Data compiled 1972.

1973c: Barnet Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.827,Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1972.

1973d: Cook Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.829,Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1972.

1973e: Playfair Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.830,Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1972.

1973f: Hislop Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.832,Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1972.

Lovell, H.L., Frey, E.D., and de Grijs, J.1973a: {Bowman Township, District of Cochrane; Ontario Div. Mines, Prelim. Map

P.837, Kirkland Lake Data Series, scale l inch to V* mile. Compiled 1972. 1973b: Mortimer Township, District of Cochrane; Ontario Div. Mines, Prelim. Map

P.851, Kirkland Lake Data Series, scale l inch to Vi mile. Compiled 1972,1973.

1973c: Coulson Township, District of Cochrane; Ontario Div. Mines, Prelim. MapP.852, Kirkland Lake Data Series, scale l inch to V* mile. Compiled 1972,1973.

1973d: Beatty Township, District of Cochrane; Ontario Div. Mines, Prelim. Map P.864,Kirkland Lalce Data Series, scale l inch to Vi mile. Data compiled1972, 1973.

Lovell, H.L., Lawton, K.D., and Ramsden, J.1969: Otto Township and Northern- Part of Marquis Township, District of Timiskaming;

Ontario Dept. Mines, Prelim. Geol. Map No.P.501, scale l inch to Vi mile. Geology 1955 and 1968.

Lumbers, S.B.1959: Bonis Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. Map

P.36, scale l inch to V* mile. Geology 1959.

Middleton, R.S.1971a: Ground Vertical Field Magnetics, Godfrey Township, District of Cochrane;

Ontario Dept. Mines and Northern Affairs, Prelim. Map P.639, Geoph. Ser.,scale l inch to V* mile. Survey and Compilation 1969.

1971b: Geophysical Grids, Robb Township, District of Cochrane; Ontario Dept. Minesand Northern Affairs, Prelim. Map P.676, Geophy. Ser., scale l inch to Vimile. Compiled 1969.

1971c: Geophysical Grids, Jamieson Township, District of Cochrane; Ontario Dept.Mines and Northern Affairs, Prelim. Map P.677, Geoph. Ser., scale l inch toVi mile. Compiled 1968.

1971d: Ground Vertical Component Magnetics, Loveland Township, District of Coch rane; Ontario Dept. Mines and Northern Affairs, Prelim. Map P.682, Geophy.Ser., scale l inch to Vi mile. Survey and Compilation 1970.

1971e: Geophysical Grids, Macdiarmid Township, District of Cochrane; Ontario Dept.Mines and Northern Affairs, Prelim. Map P.685, Geoph. Ser., scale l inchto Vi mile. Compilation 1970.

1971f: Robb Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs,Prelim. Map P.694, scale l inch to Vi mile. Geology 1969.

1971g: Jamieson Township, District of Cochrane; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.695, scale l inch to Vi mile. Geology 1968.

38

1972: Magnetic Survey of Loveland and Macdiarmid Townships, District of Cochrane;Ontario Dept. Mines and Northern Affairs, OFR5070, 41p. Accompanied by2 maps, 9 figures and 4 tables.

1973a: Loveland Township, District of Cochrane; Ontario Div. Mines, Prelim. MapP.696, Geol. Ser., scale l inch to V4 mile. Geology 1970.

1973b: Macdiarmid Township, District of Cochrane; Ontario Div. Mines, Prelim. MapP.697, Geol. Ser., scale l inch to V* mile. Geology 1970.

Milne, V.G. 1968a: Sewell Township, District of Sudbury; Ontario Dept. Mines, Prelim. Geol. Map

No.P.464, scale l inch to V* mile. Geology 1967. 1968b: Kenogaming Township, District of Sudbury; Ontario Dept. Mines, Prelim. Geol.

Map P.465, scale l inch to V* mile. Geology 1967. 1972: Geology of the Kukatush-Sewell Lake Area, District of Sudbury; Ontario Div.

Mines, GR97, 116p. Accompanied by Maps 2230 and 2231, scale l inch to^ mile.

Moon, W.1972: Magnetic Base Stations in Northern Ontario; Ontario Div. Mines, OFR5080,

99p., 3 figures, 83 photos and 82 sketches.

Moore, J.C.G.1963: Holmes Township and North Part of Flavelle Township, District of Timiskaming;

'Ontario Dept. Mines, Prelim. Geol. Map No.P.206, scale l inch to Vt mile. Geology 1962.

1966: Geology of Holmes-Rurt Area, District of Timiskaming; Ontario Dept. Mines, GR44, 20p. Accompanied by Map 2078, scale l inch to ^ mile.

Moore, E.S.1936: Geology and Ore Deposits of the Ramore Area; Ontario Dept. Mines, Vol.45,

pt.6, p. 1-37 (published 1937). Accompanied by Map No.45d, scale l inch to 3A mile.

ODM1912:

1938:

ODM-GSC 1970:

ODMNA 1971a:

1971b:

1971c:

1971d:

1971e:

Map showing Gold Area in the Township of Munro and Guibord, District of Timiskaming, Ontario Dept. Mines, Vol.21, pt.l, Map 21c, scale l inch to l mile.

Porcupine Area, District of Cochrane, Ontario; Ontario Dept. Mines, Vol.47, pt.2, Map 47a, scale 2,000 feet to l inch.

Timmins Sheet, Cochrane, Timiskaming, and Sudbury Districts, Ontario; Ontario Dept. Mines-Geol. Surv. Canada, Aeromagnetic Map 7085G, scale l inch to 4 miles. Survey 1947, 1948, 1949.

Aeromagnetic Survey, Total Intensity Contours, Coulson Township, District ofCochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.641,scale l inch to V* mile. Survey July 1970.

Aeromagnetic Survey, Total Intensity Contours, Warden Township, District ofCochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.642,scale l inch to V4 mile. Survey July 1970.

Aeromagnetic Survey, Total Insensity Contours, Beatty Township, District ofCochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.643,scale l inch to 1A mile. Survey July 1970.

Aeromagnetic Survey, Total Intensity Contours, Munro Township, District ofCochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.644,scale l inch to V4 mile. Survey July 1970.

Aeromagntic Survey, Total Intensity Contours, Guibord Township, District ofCochrane; Ontario Dept. Mines and Northern Affairs, Map No.P.646, scalel inch to V* mile. Survey July 1970.

39


1971f: Helicopter Gamma Ray Spectrometer Survey, Total Count Contours, Coulson Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.647, scale l inch to V4 mile. Survey July 1970.

1971g: Helicoper Camma Ray Spectrometer Survey, Total Count Contours, Warden Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.648, scale l inch to Vt mile. Survey July 1970.

1971h: Helicopter Gamma Ray Spectrometer Survey, Total Count Contours, Beatty Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.649, scale l inch to V4 mile. Survey July 1970.

1971i: Helicopter Gamma Ray Spectrometer Survey, Total Count Contours, Munro Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.650, scale l inch to V\ mile. Survey July 1970.

1971j: Helicopter Gamma Ray Spectrometer Survey, Total Count Contours, Hislop Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.651, scale l inch to V4 mile. Survey July 1970.

1971k: Helicopter Gamma Ray Spectrometer Survey, Total Count Contours, Guibord Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.652, scale l inch to V4 mile. Survey July 1970.

19711: Helicopter E-Phase Survey, Apparent Resistivity Contours, Coulson Township, District of Cochrane; Ontario Dept. Mines and Northerni Affairs, Prelim. Map No.P.653, scale l inch to V* mile.

1971m: Helicopter E-Phase Survey, Apparent Resistivity Contours, Warden Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.654, scale l inch to V* mile.

1971n: Helicopter E-Phase Survey, Apparent Resistivity Contours, Beatty Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Map No.P.655, scale l inch to ^4 mile.

1971o: Helicopter E-Phase Survey, Apparent Resistivity Contours, Munro Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.656, scale l inch to V4 mile.

1971p: Helicopter E-Phase Survey, Apparent Resistivity Contours, Hislop Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.657, scale l inch to Vi mile.

1971q: Helicopter E-Phase Survey, Apparent Resistivity Contours, Guibord Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.658, scale l inch to V4 mile.

1971r: Helicopter Radiophase Survey, In-Line, In-Phase Contours; Coulson Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map 'No.P.659, scale l inch to V4 mile.

1971s: Helicopter Radiophase Survey, In-Line In-Phase Contours, Warden Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.660, scale l inch to V4 mile.

197 It: Helicopter Radiophase Survey, In-Line In-Phase Contours, Beatty Township, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map No.P.661, scale l inch to V4 mile.

1971u: Helicopter-Borne Geophysical Survey, Magnetic and Gamma-Ray Spectrometer Profiles, Loveland, Macdiarmid, Robb, Jamieson, Turnbull and Godfrey Townships, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map P.688, scale l inch to Vz mile. Survey April 1971.

1971v: Helicopter-Borne Geophysical Survey, E-Phase and Radiophase Profiles, Love land, Macdiarmid, Robb, Jamieson, Turnbull and Godfrey Townships, District of Cochrane; Ontario Dept. Mines and Northern Affairs, Prelim. Map P.689, scale l inch to Vz mile. Survey April 1971.

Prest, V.K.1951: Geology of the Carr Township Area; Ontario Dept. Mines, Vol.60, pt.4, p. 1-24

published 1952). Accompanied by Map No.1951-1, scale l inch to 1,000 feet.

40

Pyke, D.R.1968a: Langmuir Township, District of Timiskaming; Ontario Dept. Mines, Prelim.

Geol. Map No.P.444, scale l inch to V4 mile. Geology 1967. 1968b: Blackstock Township, District of Timiskaming; Ontario Dept. Mines, Prelim.

Geol. Map No.P.445, scale l inch to V4 mile. Geology 1967. 1968c: Fallon Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.496, scale l inch to V4 mile. Geology 1968. 1968d: Fasken Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.497, scale l inch to V4 mile. Geology 1968. 1969a: Adams Township, District of Timiskaming; Ontario Dept. Mines, Prelim. Geol.

Map No.P.571, scale l inch to V4 mile. Geology 1969. 1969b: Eldorado Township, District of Timiskaming; Ontario Dept. Mines, Prelim.

Geol. Map No.P.572, scale l inch to V4 mile. Geology 1969. 1970: Geology of Langmuir and Blackstock Townships, District of Timiskaming;

Ontario Dept. Mines, GR86, 65p. Accompanied by Map 2206, scale l inchto ^ mile.

1971a: McArthur Township, District of Timiskaming; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.631, Geol. Ser., scale l inch to V4 mile. Geology 1970.

1971b: Douglas Township, District of Timiskaming; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.632, Geol. Ser., scale l inch to V4 mile. Geology 1970.

1972a: Bartlett Township, District of Timiskaming; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.745, Geol. Ser., scale l inch to V4 mile. Geology 1971.

1972b: Geikie Township, District of Timiskaming; Ontario Dept. Mines and NorthernAffairs, Prelim. Map P.746, Geol. Ser., scale l inch to V4 mile. Geology 1971.

1972c: Geology of Adams and Eldorado Townships, District of Timiskaming; OntarioDiv. Mines, OFR5084, 94p., 8 tables, 7 figures, 3 photos, 2 maps, scale l inchto V* mile.

1973a: Geology of Fallon and Fasken Townships, District of Timiskaming; Ontario Div.Mines, GR104, 31p. Accompanied by Map 2253, scale l inch to Vi mile.

1973b: Peterlong Lake Area, Districts of Timiskaming and Sudbury; Ontario Div. Mines,Prelim. Map P.810, Geol. Ser., scale l inch to l mile. Geology 1972.

Pyke, D.R., and Middleton, R.S.1970: Distribution and Characteristics of the Sulphide Ores of the Timmins Area;

Ontario Dept. Mines, MP41, 24p. Accompanied by one map, scale l inch to 2 miles.

Ramsden, J. and Lovell, H.L.1966: Otto Township (North Half), District of Timiskaming; Ontario Dept. Mines,

Prelim. Geol. Map No.P.330, scale l inch to 1,000 feet. Compiled 1965.

Rogers, W.R., and Bruce, E.L.1912: Cripple Creek Gold Area; Ontario Bur. Mines, Vol.27, pt.l, p. 266-270. Accom

panied by Map No.21e, scale l inch to l mile.

Rupert, R.J., and Lovell, H.L.1970: Geology of Bernhardt and Morrisette Townships; Ontario Dept. Mines, GR84,

27p. Accompanied by Map 2193, scale l inch to ^ mile.

Satterly, J.1948: Geology of Michaud Township: Ontario Dept. Mines, Vol.57, pt.4, p. 1-27

(published 1949). Accompanied by Map No. 1947-3, scale l inch to 1,000 feet.1949: Geology of Garrison Township; Ontario Dept. Mines, Vol.58, pt.4, p. 1-33.

Accompanied by Map No. 1949-1, scale l inch to 1,000 feet.1951a: Geology of Harker Township; Ontario Dept. Mines, Vol.60, pt.7, p.1-47 (pub

lished 1952). Accompanied by Map No.1951-4, scale l inch to 1,000 feet.1951b: Geology of Munro Township; Ontario Dept. Mines, Vol.60, pt.8, p.1-60 (pub

lished 1952). Accompanied by Map No.1951-5, scale l inch to 1,000 feet.1952: Geology of McCool Township; Ontario Dept. Mines, Vol.61, pt.5, p.1-30 (pub

lished 1953). Accompanied by Map No. 1952-2, scale l inch to 1,000 feet.

41


1953: Geology of the North Half of Holloway Township; Ontario Dept. Mines, Vol.62,pt.7, p.1-38 (published 1954). Accompanied by Map No.1953-4, scale l inchto 1,000 feet.

1959a: Reaume Township, District of Cochrane; Ontario Dept. Mines, Prelim. MapP.13, scale l inch to V4 mile. Compilation 1953.

1959b: Mann Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map P.14,scale l inch to V4 mile. Compilation 1953.

1959c: Newmarket Township, District of Cochrane; Ontario Dept. Mines, Prelim. MapP.15, scale l inch to Vi mile. Compilation 1953.

1959d: McCart Township, District of Cochrane; Ontario Dept. Mines, Prelim. MapP. 16, scale l inch to V* mile. Compilation 1953.

1960a: German Township, District of Cochrane; Ontario Dept. Mines, Prelim. MapP.37, scale l inch to V4 mile. Compilation 1959.

1960b: Taylor Township, District of Cochrane; Ontario Dept. Mines, Prelim. Map P.39,scale l inch to Vi mile. Compilation 1959.

Satterly, J., and Armstrong, H.S.1947: Geology of Beatty Township; Ontario Dept. Mines, Vol.56, pt.7, p. 1-34 (pub

lished 1949). Accompanied by Map No. 1947-2, scale l inch to 1,000 feet.Savage, W.S., Ginn, R.M., and Fenwick, K.G.

1962: Kirkland Lake Sheet, District of Cochrane and Timiskaming; Ontario Dept. Mines, Prelim. Geol. Map No.P.150, scale l inch to 2 miles. Compilation 1961, 1962.

Simony, P.S.1963a: Rickard Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol.

Map No.P.199, scale l inch to V4 mile. Geology 1963. 1963b: Knox Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. Map

No.P.200, scale l inch to Vt mile. Geology 1963. 1963c: Kerrs Township, District of Cochrane; Ontario Dept. Mines, Prelim. Geol. Map

No.P.201, scale l inch to V4 mile. Geology 1963.

Tanton, T.L.1917: Gogama-Missonga Sheet, Geological Survey of Canada, scale l inch to 4 miles.

Wolfe, W.J.1971: Kamiskotia-Whitesides Area, District of Cochrane; Ontario Dept. Mines and

Northern Affairs, Prelim. Map P.633, Geol. Ser., scale l inch to ^ mile. Geology 1969.

1972a: Geochemical Distribution of Aqua Regia Soluble Copper in Felsic Plutonic Rocks, Cairo Township, and parts of Alma, Holmes, and Flavelle Townships, District of Timiskaming; Ontario Dept. Mines and Northern Affairs, Prelim. Map P.732, Geoch. Ser., scale l inch to Vz mile. Geochemical compilation 1971, geochemical field work 1970.

1972b: Geochemical Distribution of Total Molybdenum in Felsic Plutonic Rocks, Cairo Township and parts of Alma, Holmes, and Flavelle Townships, District of Timiskaming; Ontario Dept. Mines and Northern Affairs, Prelim. Map P.733, Geoch. Ser., scale l inch to ^ mile. Geochemical compilation 1971, geo chemical field work 1970.

42

INDEX

PAGE

Abitibi Gravity High ....................... 12Abitibi Greenstone Belt .............. 10,14,23Abitibi River ............................. 12Adams Tp. ............................... 10Anorthosite ........................ .8,11,24Ansonville ............................... 12Argyle Metavolcanics ...................... 12Argyle Tp. ............................... 12Aubin Tp. ............................ .11,14Aurora Tp. ............................... 11

Barbers Bay to Macklem Tp., Hwy. 67, profile ................................. 19

Basalt ............................... .11,15Batholiths:

Round Lake ............................ 10Watabeag Lake ......................... 10

Beatty Tp. ............................... 17Beatty-Carr Tp. boundary, profile ...... 16,17

Beemer Tp. .............................. 14Bigwater Lake ............................ 22Black River ............................... 18Black River Fault .................. .13,18, 27Blackstock Tp. ......................... 10,12Black Tp. ................................ 10Bouguer gravity values .................... .6Bristol Tp. ............................ 11, 23Buskegau River Fault ...................... 13

Canadian Jamieson Mine .................. .24Carnegie Tp. .......................... 11,13Carr Tp. .............................. 13,27

Carr-Beatty Tp. boundary, profile ...... 16-17Carr Tp., Lot 2-3, boundary, profile ....... 17•Carr Tp., Lot 4-5 boundary, profile ....... 17

Cleaver Tp. .............................. 12Cody Tp. ................................20Conglomerate ......................... 18,20Correction to gravity observations .......... 6-8Cote Tp. ................................ .26

Cote Tp. to Denton Tp.-Mallette Lumber Road, profile ..................... .25-26

Crawford Tp. ......................... 11,13Cross Lake Fault .......................... 13

Deloro Tp. .............................. .22Deloro Tp. to Wark Tp., profile ....... .22-23

Denton Tp. .............................. .23Denton Tp. to Cote Tp.-Mallette Lumber

Road, profile ..................... .25-26Destor-Porcupine

Fault ........... l, 2,12,14,16-22 passim, 27Diabase dike ............................. 19Dunite .................................. 19

PAGEEarlton ................................. .13Ecstall Mining Ltd. ....................... .24En-id Tp. ................................. 10Epidote .................................. .8

Fasken Tp. .............................. .10Faults:

Black River ........................13,27Buskegau Lake .........................13Cross Lake ............................. 13Destor-Porcupine

............. .1,2,12,14,16-22 passim, 27Hislop ................... .13,17,18,19,27Lake Timiskaming System ................ 13Lake Timiskaming West Shoreline ......... 13Mattagami River ..................... 14, 24Montreal River ...................... 13,14Pipestone .............................. 16

Faulting .............................. 13-14Findlay Tp. .............................. 11Fortune Tp. .............................. 10Frederick House Lake .................. 13, 27Frey Tp. ................................. 10

Gabbro ........................ .8,11, 24, 26Gabbro intrusions .................. 12, 23,25Geary-Reid Gravity High ................... 11German Tp. ........................ *..... 11Godfrey Tp. ....................... .11,14,24Gold ................................... .27Granodiorite ................... .22,23, 25,26Gravimeter, Worden ........................ 3Gravity profiles ........ Charts A, B, back pocket

Descriptions ......................... 14-27Grenfell Tp. .......................... .10,12Greywacke ............................... 18Guibord Tp. ................ .11,12, 17, 20, 21

Hanna Gravity High ....................... 12Hanna Tp. ........................... .11,12Henley Tp. ............................... 11Hincks Tp. ............................... 12Hislop Fault ................ .13,17,18,19,27Hislop Tp. ........................ .17,18,19Holmes Tp. .............................. 10Holtyre to Munro Mine, profile .......... 14-16Hoyle Tp. ............................... .26

Hoyle to Munro Tp.-Hwy. 101, profile . .26-27

Ice Chest Lake Road ..................... .21Ilmenite ........................... 11,24, 25Intrusions, felsic ............. 11,12, 22, 25,26Intrusions, gabbro ...................... 12, 23

43


PAGE

Intrusions, mafic .................. 11, 12, 13Intrusions, ultramafic ...................... 19Intrusive phases, mafic ..................... 21Intrusive rocks, felsic ................ 14, 23, 27Intrusive rocks, mafic ................... 22, 26Iron oxide formation ........................ l

Jamieson Tp. .......................... 14, 23Jessop Tp. ............................ 11, 23Jowsey Lake .............................. 26Jowsey Lake granite ....................... 25

Kamiskotia ............................... 23Kamiskotia Complex ............ l, 2, 24, 25, 26Kamiskotia Creek ......................... 11Kamiskotia-Hwy. 576-Mountjoy Tp., profile . .24 Kamiskotia Hill ..................... .2, 24, 25Kamiskotia-Kidd Gravity High . .11,12,13,14, 23 Kamiskotia Lake ........................... 3Kam-Kotia Mine ......................... .24Kenogamissi Lake .................. 12,16, 22Kettle Lakes Provincial Park ............... .21Kidd Creek ............................... 11Kidd Creek Gravity High ............ 11,13,14Kidd Creek Mine ......................... .24Kidd Tp. ............................. .11, 23

Lake Abitibi .............................. 12Lake Timiskaming ........................ 13Lake Timiskaming West Shoreline Fault ...... 13Langmuir Tp. ............................ 12Lee Tp. .................................. 10Little Tp. ................................ 11Lucas Tp. ............................. 11,13

McCarm Tp. .............................. 10Macdiarmid Tp. ......................... .23Macklem Tp. ............................. 12

Macklem Tp. to Barbers Bay, Hwy. 67, profile ............................ 19-20

McNeil Tp. .............................. .12Mahaffy Tp. ............................. .13Mallette Lumber Road-Denton Tp. to Cote

Tp., profile ......................... .25-26Map, Bouguer Gravity ........... .back pocketMap, interpretation of Bouguer

Gravity ....................... .back pocketMassey Tp. .............................. .26Matheson Metavolcanics ................... 12Mattagami River ......................... .23Mattagami River Fault .................. 14, 24Metamorphic rocks ........................ 14Metasedimentary rocks ...................... 3Metasedimentary Zone .................. 12,14

Stock-Carr-Guibord, profile .............. 13Metasediments .......... l, 11,15-24 passim, 27Metavolcanics ................. l, 12-27 passimMetavolcanics, Argyle ..................... 12Metavolcanics, felsic ................ 12, 22, 24

44

PAGE

Metavolcanics, mafic ... 11,12,14,16,17,18,19,20,21,22,23,25,26,27

Metavolcanics, Matheson ................. .12Michaud Tp. ............................. 11Montieth, junction of, Hwy. 101-Hwy. 11,

profile .............................. 18-19Montreal River Fault ................... 13,14Monzonite ............................... 23Mount Jamieson ......................... .24Mountjoy Tp. ................... 11,12, 23,24

Mountjoy Tp.-Kamiskotia-Hwy. 576, profile ...............................24

Mountjoy Tp. to Sturgeon Falls, profile .... 23 Munro Mine .............................. 14

Munro Mine to Holtyre, profile ....... .14-16Munro Tp. .............................. .26

Munro Tp. to Hoyle-Hwy. 101, profile . .26-27 Murphy Tp. ............................. .22Musgrove Tp. ............................ 14

Nesbitt Tp. ............................... 11Newmarket Tp. ........................... 11Night Hawk Lake ......................... 13Night Hawk Lake Peninsula ............... .20

Hwy. 575, profile ................... .20-21Norite ...................... .8,11, 24, 25,26

Ogden Tp. .............................. .23Otto Stock ............................ 10,13Otto Tp. ................................. 10

Pegmatitic phases ......................... 11Peridotite ...................... .11,12,19, 22Pinard power line ......................... 22Pipestone Fault ........................... 16Playfair-Grenfell Gravity High ....... 10,12,13Playfair Tp. ....................... .10,12,18Pliny Tp. ............................... .11Porcupine Syncline ....................... .22Porphyry, quartz .......................... 24Prosser Gravity High ................... 11,13Prosser Tp. .......................... .11,13Pyne Tp. .................................11Pyrite ............................ .11, 24, 25Pyroclastic rocks, felsic ................... .22Pyroclastic rocks, mafic ................... .21

Quartz porphyry ......................... .24

Recommendation to prospectors ........... .27Reid Tp. ............................. .11, 23Robb Gravity High ................... .24,26Robb Tp. .......................... 11, 25, 26Rocks, syenide alkalic ..................... 10Round Lake Batholith .................. 10, 13

St. John Tp. .............................. 11Sand ....................................22Sandy Falls ............................. .23

Serpentine ........................... .22, 23Sewell-Pharand Gravity High ............... 12Sewell Tp. .............................. .12Shillington ............................... 19Shillington to Hwy. 11, Hwy. 577, profile .... 19Specific gravity of rocks ................... 8-9

Table of ............................... .9Stock-Carr-Guibord Metasedimentary Zone .. 13 Stock Tp. ................................19Sturgeon Falls to Mountjoy Tp., profile .... .23Sturgeon Falls power line ................. .23Sulphide minerals .......................... 8

See also: Pyrite. Survey, geophysical ....................... 16

PAGESurveys, methods ........................ 3-5

Recording card, figure ................... .4Sweetman Tp. ............................ 11

Taylor Tp. ............................... 18Tisdale Tp. ............................. .22Trondhjemite ............................ .23Turnbull Tp. ......................... .11, 26

Ultramafic intrusions ...................... 19

Wark Tp. ......................... .11, 22, 23Wark Tp. to Deloro Tp., profile ....... .22-23

Watabeag Lake Batholith .................. 10Wawaitan power line ...................... 22Whitesides Tp. .................... .11, 23,26Winter Lake ............................ .26

45

Timmins — Matheson Gravity Survey Chart A-Figures 3 to 12

GEOLOGICAL SECTION

Mafic imtmkanics ' Mafic iMtamlcanics

FIGURE 3-Profile 1 -Munro Mine to Holtyre.

GEOLOGICAL SECTION

Mafic avtmelcanics li t -i Matastdimeiits Mafic oetavokanks

FIGURE 7-Profile 5-Along Highway 11, from Highway 101 junction to Monteith.

S 3

GEOLOGICAL SCCTIOM GEOLOGICAL SECTION GEOLOGICAL SECTION

Mafic metavolcanics li Mafic nwtankanics l S i: Mitastdimtnts2 s.^ Mafic

FIGURE 4-Profile. 2-Carr-Beatty Township Boundary. FIGURE 5-Profile 3-Carr Township, Lot 2-3 Boundary. FIGURE 6-Profile 4-Carr Township, Lot 4-5 Boundary.

I -40-

GEOLOGICAL SECTION GEOLOGICAL SECTION

Mafic•clavolcanics

Metasediment*

i \Mafic Mafic metavolcanics mi ultnmafic rocks

JLitasedimtnls

FIGURE 8-Profile 6-Highway 577, Shillington to Highway 11. FIGURE 9-Profile 7-Highway 67, Macklem Township to Barbers Bay.

l! l illS -f \s II5 10 IS

GEOLOGICAL SECTION

2S 3D

GEOLOGICAL SECTION

38 NORTH

Mafic mctavdcamcs

s*lil M, letasediments Mafic metOTofcinics Mafic meta vol. Mafic metavelcanics l Felsic

l intnisilMMefic ll\

metavolcamcs i ?Mafic metavolcanics

Pofcupine SynclineGEOLOGICAL SECTION

Metasediment! and felsic pyrolastic rocks

Mainly mafic metavelcanicsFelsic metavolcanics?

Mafic metavolcanics and mafic intrusions

Mainly enfic metavolcanics Mafic metavolcanics l with mafic intrusions

FIGURE 10-Profile 8-Highway 803, Night Hawk Lake Peninsula. FIGURE 11 -Profile 9-Ice Chest Lake Road. FIGURE 12-Profile 10-Deloro Township to Wark Township.

01234

Miles 3

5 6 l a m e t r e s

7 B 9 10

Timmins —Matheson Gravity Survey Chart B-Figures 13 to 17

GEOLOGICAL SECTION GEOLOGICAL SECTION

i!e

Mainly Miiflly mafic m 11 a v o l c a n i c i 1 l i! Mainly felsic metavolcanics(RhyolitXiiff and Utm)S *S"~3 | s

^if5 5E

E

i"

co

Kamiskotia complex gabbro-norite Mane wtavolcanics(Basalt)

SMC 12970

M i l i i 3

Mile: 3

34567 K i l c m 11 ri s

FIGURE 13-Profile 11-Mountjoy Township to vicinity of Sturgeon Falls. FIGURE 14-Prof ile 12-Highway 576, Mountjoy Township-Kamiskotia.

. -25-

Cottagi Road

S

STATION ' ' ' SOUTH

Tap dinclinGEOLOGKAl SECTION GEOLOGICAL SECTION

Kamiskotia complex oabbro-noritt Mafic mtawknics Jowsty Late felsic intnisi(Mi(Gra(wdiontt| I Mafic Mtavolcanics Whintide jabbnmonte^Boithosrte Felsic intrasioe (Granodionti) RobboaMriHioritt

Hilts 05

K i l o m t t i l s Kilometres

FIGURE 15-Profile 13-Kamiskotia Hill. FIGURE 16-Profile 14-Denton Township-Cote Township.

STATION '—"~ WEST

GEOLOGKAl SECTtON

Ittasedieieiiti Mafic meta.oh

Miles 3

1 2 3 4 5 6 K i lometris

9 10

FIGURE 17-Profile 15-Highway 101-Hoyle to Munro Township.

ONTARIO DIVISION OF MINES

HONOURABLE LEO BERNIER. Minister of Natural Resources

DR. J K. REYNOLDS. Deputy Minister oi Natural ResourcesG A Jewett. Executive Director. Division at Mines E. G. Pye. Director. Geological Branch

Map 2321 Bouguer Gravity Timmins—Matheson

46=00'

.s -*IHOYI Vf

^Vill KM! NOT

S \J?*-(01 Tanton

u.:rm3

SYMBOLS

Conlours of equut Bouguer snomali&f, a! intervals ot 2 rnilligals.

Gravty station

Control station.

For other conventional signs refer to 1:250,00 National Topographic System.

NOTES AND REFERENCES

Gravity survey by R. S Middleton and assistants. Geolog ical Branch. 1970. 1971

Regional geology by D. R. Pyke. L. D. Ayres and D. G. Innes: Map 2205, Timmms-KirklantJ Lake, Geological Compilation Series. Scale 1 inert lo 4 miles, published T 9 73.

Bouguer values have been calculated using s rock den sity of ? fi? grams per cubic centimeter Gravity stations were tied to a local gravity net which was in turn tied to the Canada Grsvity net.

Gravity values obtained through the Earth Physics Branch. Department of Energy. Mines and Resources. Ottawa, were compiled with the present survey results in order to reproduce a complete map of the area.

Cartography by D. W Robeson and assistants, Surveys and Mapping Branch. 1974.

Map base from map 42A of the National Topographic System.

Pub/ishsd 7.9/6 wwerse Mercator pioiectior

Miles 5

Kilometres 5

Map 2321 Bouguer Gravity '

TIMMINS-MATHESON

Scale 1:250,000 Echelle5 10

10 15 25 30 Kilometre)

ONTARIO DIVISION OF MINES

HONOURABLE LEO BERNIER Minister of Natural ResourcesDR J K REYNOLDS. Deputy Minister uf Natural Resources

G, A Jewett. Executive Director. Division of Mines E. G Pye, Director. Geolog'cal Branch

Map 2322Interpretation of Bouguer GravityTimmins—Matheson

/ kINCSMILI./

\ \PROSSER GRAVITYTHOH-^GEARY-REfrO

GRAVITY

-J" --f- /- ——— --- v - l /M,-' 'AfJ t A

KIDD CREEK

ByeraMountaVi '

Pop!ar Night Haufk LJ ^ -

y' WHITESIDES^";GRAVITY HIGH

© "V ~^

/RAKNTT A

i i uune , ^ |

# -'^ M \ \Con

Fire Lookout \-\

^WfiARGYLE/ s *

VO4&D

\S

f HOLMES

(P \ Abaifoneil -f^^^': \ T ^u r.x,,,,rv l M:____t

l'975

MilviS

Map 2322 Interpretation of Bouguer Gravity

TIMMINS-MATHESONScale 1:250,000 Echelle5 10

Scale, l inch to 200 miles

PRODUCING OR PAST PRODUCING MINES

1 Dome Mines Lid. . .... ..........,....................Festal Mining Ltd

2 Kidd Creek -nine .. ... .j Hailnor Mines Ltd ,. .... ... ..

Harrison Drilling and Exploration Co Ltd. A Potter (Munro Copper) "line .................5 Heuman Mines Lid. ,. ..........,,,...,.,...,.,....,..

hollinger Mln&s Ltd.6 Re as mine ... . . ..........,.....................J Jamelanc Mines LW ......................,....~...SKarr-Kotia Mines Lid. .......... ....................9 Mcintyre Porcupine Mines LW ............ .... .... .... Au

Zii.Cu Pb, AgAu, Ay

Cu. Zr .......asb

AU, ABCu, Zn Cu, Zn Ag, Ci.Au, Ag Au. Ag

....., Ni

10 Pamour Porcupine Mines L1d11 TegrenGoldlield Lid. .....12 Toxmont Mines Ltd. .. ...,.

Upper Canada Mines utd13 Macassa mine (management agreement with Wlllroy Mines

Ltd ) . .. . . . . .... ...................... .... AJ, Ag14 Ashley Gold Mining Corp Ltd . . .... ........—..... .... Au, Ag

Associated Arcadia Nickel Corp. Ltd.15 Tobutrr mine ... ..... ...,........................................... .. Au. Ag

Associated Porcupine Mines Ltd. 1 B Gillies Lake mine .... ..... ..... ................................... Au, Ag1 7 Paymaster m inn ..... .... ........... ........................ .... AJ, Ag1B Aundr Cold Mines Lti .. .... ............................ ..... .... . .. Au

Banner Pore u pi r e Mines Ltd.19 Scottish Untario mine ,.... ...,............................... .... Au, Ag

Broulan Reel Mines20 Boietiil mine .... ....,.......................................... ..... Au, Ag2" Bonwhit mine ... .... ...... ............................,............ ... . Au22 BroUan mine ... .... .... .... ... .... .. . -- -- Au, Ag23 Ree* mine ,....,....,.,,..,,,...,.,...,,,...,,,...,.,,..,,.....,............ Au, Ag24 Caiadiar Jamieson Mines Ltd, ,...,,....,,,..,,,,...,,,..-,.,.... Zn, C j

Canadian Johns-Manville Co. Ltd.25 Barton Oeek mine .. ......................,........................ .... asb26 Munro ir-inR . ... .... . .. .... ...............ash21 Cincinnati-Porcupine Mines Ltd. . ... .... .... .... ...........Au2H Davidson-Tisdale Mines Ltd, ........ ,.......... ........... ....... Au, Ag23 Delnite M nes HO. . ........... ..........,............. ..... ,— -. Au, Ag

F-aiconbr dge Nickel Mines LW. 3C Hoyte mine .., ,.... ....,.,...,,,,..,,,...,,,...,.,.....,.....,.,.......... Au, Ag31 Fuller mine-Edwards Claim .... ................................... . ... .. Au

Gateford Mines Ltd32 Crescent Kirkland mine... ..., ........—...,. ..—.—. . Au Aa.33 Golden Gate mine .... ..... ........................................ Au. Ag34 Hollinger Consolidated Gold Mines Ltd..................... Au, Ag W

Hollinger Conso'idaTBd Gnlfl Mines Ltd.35 Crown -nine .... .... .... ........................... .36 Vipord rnine ..................,.............................. 37 Huch-Parn Porcupine Mines Ltd. .....,..............

Hydra Exp orations Lid, 38 Night HaivK Pamnsuiar mine ........................

KenJIwOf'ih Mines Ltd 3S Naybob mine ... ... ...... .... ...,, ...,. ........... .40 K rklandTownsite Gold Mines Ltd. — ..... .... .41 Lake Shore Mines Lid. ,... ,...............................42 Moneta Porcupine Mines Ltd. ..........,.,...,.....,..43 Mi,nro-C'cesus mine .... ...............................

Nakhodas Mining Co. Ltd.44 Bownian mine... ... .... .... .... ............,......45 Fsymarrnine ..... ..... .... .............................,.,

New Hope Porcupine Gold Mines Ltd. 45 De Santis rnina ............,............................. ..

Noranda Mines Ltd. 47 Alexo mne .... ...................................,.,..,,.43 Preston Mines Ltd. .....,...,,,..,,,...,,,...,,,.......,.,.,.49 Porcupine Lake rnine .,...,,,.....,.........,.,.....,...,,,.

Pomfield Building Corp. Ltd.50 Buffalo Anhenta mine .. ............................. .EI Sylvanite Gold Minos Ltd .. ........... ...,..........

Tm;h Coip. Ltd.—Teck Hughes Mining Division52 Kirkland Lake mine ......,..,.,...,.,.....,...........,.....,,,,. . Au, Ay53 Teck-Hughes mine ...............54 United Ooalski Mining Co. Ltd.

Westfield Minerals Ltd.55 Coniaururn mine ..... ......................................... .. Au, Ag56Wiiyht-Hargreaves Mines Lid. .......................,.............. Au, Ag

METAL AND MINERAL

Au, Ag Au. Ag Au, Ag

Au, Ag

Au, Ag Au, Ag Au, Ag Au. Ag Au. Ag

...... astAu, Ag

Au, Ag

. Mi, Ci, ALI. Ag An, Ag

Au, Ac; Au. Ac

asb Au Cu

REFERENCE

Silver Ni .......Asbestos Pb ......,.Gold W...,.,..Copper Zn . ..

.............Mcfref

.............Lead

.............Tungsten

.............Zinc

SYMBOLS

Producing or past producing mine.

fault

Geological boundary as defined from gr a vity

Isolated gravity high within regional gravity high.

Mineral occurrence.

F o' other conventional signs refer f o 1.250.000 National Topographic System.

NOTES AND REFERENCES

Gravity survey by R. S. Middleton and assistants. Geolog ical Brunch. 1970, I97t.

Regional geology by D. Ft. Pyke. L. D. Ayres and D G Innes: Map 2205. Timmins-Kirkland Lake. Geological Compilation Series Scale 1 inch to 4 miles, published 1973

Bouguer values have Oeen calculated using a rock den sity of 2.67 grams per cub'c centimeter Gravity stations were lied to a local gravity net which was in turn tied to the Canada Gravity net.

Gravity values obtained through the Earth Pnysics Branch, Department at Energy, MinsK artel Resources, Ottawa were compiled with the present survey results m order to reproduce a complete map o! the area.

Cartography Dy D W. Robeson and assistants. Surveys and Mapping Branch. 1974.

Map bass from map 42A of the National Topographic System

15 20 Mille;

Kilometres 5 10 15 20 25 30 Kilometres

timmins and matheson area: gravity survey of …...chart a (back pocket) 3—profile l—munro mine...

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