52Be9NWaail 63.4366 KASHABOWIE LAKE

A REPORT

DESCRIBING THE GEOPHYSICAL SURVEY ON LAND LEASED

FROM THE ONTARIO DEPT. OF MINES,

DECEMBER 1st.1942

BY

THE AIDERM4C COPPER CORPORATION, LIMITED

010

KASHABOWIE CONCESSION

An area of approximately twenty-nine square miles in the

Kashabowie District of western Ontario was closed to staking from

Dec. first 1942 to June first 1943 to allow Aidermac Copper Corp.

to do geophysical and other prospecting work. 1'he concession was

granted by the Ontario Dept. of Mines upon payment of a fee and

upheld the rights of any claim owners in the area as of Dec. first

194S. '-^he area was bounded on the east by the west boundary of K-56

and its extension south to the south shore of Upper Shebandowan Lake,

on the south by the south shore of the lake and the old tote road

west to the east boundary of Moss Township, on the west by the east

boundary of Moss township and on the north by the south boundary of

Ames '^'ovmship, the '^'ip 1'op Spur and the C.N.R. It also provided

that the company could stake and record claims within the time of

the concession.

The season of the concession provided only a&out six weeks

when the ground was free from snow and frost so geophysical methods

suitable to these conditions had to be employed, it was decided to

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cover the vhole area with a magnetometer survey during t he winter

months and with these results as a guide carry out detailed work with

solf potential and resistivity methods in the spring. It soon

became evident that sufficient labour could not be obtained to cut

the necessary picket lines and that it vrould be impossible to complete

the magnetometor survey in t he tins allocated. It was then decided to

cover certain geologically favourable areas first and use the remaining

time to the best advantage. Approximately seven square miles of the

concession were tested by geophysical methods. Five forty acre claims

were staked in the concession as a result of the work.

GEOPHYSICS -

The magnetic measurements were made with an Askania magnetometer,

which measured the vertical component of the earth*s magnetic field,

'i'he readings were corrected for temperature, daily variations and tied

to an arbitrary zero. The values mapped have an accuracy of ^K 10

gammas, ^'he variation in magnetic values is due to the variation in

quantity of magnetite,'in the bed rock or the concentration of other

magnetic substances such as pyrrhotite. It is sometimes possible to

locate geological contacts, shear zones, faults and other data from

these results.

The self potential methods used are based on the fact that

oxidizing sulphides become electrically polarized. These polarized

bodies set up an electrically potential field about themselves. This

field can be measured by suitable instrurasnts. In this case a D.C.

- 3 -

Potentiometer was used to measure the potential between two electrodes,

one stationary, and the other moved at one hundred foot intervals along

a line. A reel of copper wire on a stand served to complete the circuit.

The resistivity method used is known as the "Central point jvjjthod".

It was developed by prof.. (.CHlchrist of Toronto University. The sulphides

give lower resistivity than other rock types.

GEOLOGY;-

'i"he rocks underlying the concession vary in age from Couchichingi

sediments to late Pre-Cambrian diabase, but for the most part consist

of Keewatin lavas and related intrusives. T ne geology has been mapped

by Dept. of Minos geologists and is shown on the east half of the Quetico

sheet. The Shebandowan Area sheet covers part of the concession in more

detail.

Additional work done 1 by the writer is shown on IJip No. 15. This

work was concentred in the areas to be investigated by diamond drilling.

Outcrops of Couchiching sediments were located s.xmth of the C. N. tracks,

half a mile vrest of Kashabowie, but the contact with the Keewatin is not

exposed. A large body of gabbro was intruded just south of these sedi-B

raents. It was on the contact of this gabbro that one of the most

interesting geophysical anomalies was found.

The Keewatin fi OUT rocks underlie the gredlsr part of the concession.

They vary in composition and include many bands of agglomerate or breccia.

Some narrow bands of iron formation outcrop in the lavas on the north

shore of Shebandowan lake.

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An irregular mass of Granodiorite is intruded in the eastern

part of the concession and extends eastward on claims K-56 and Z-71.

It is white in colour and contains a very snail percentage of basic

minerals, '-^lis rock also outcrops in other parts of the district.

The granites are very conspicuous because of their red colour. Large

masses jut into the concession on the northwest and Southeast of

Burchell lake. Smaller bodies intruded in the greenstones are usually

lenticular along the strike of the formation. An extensive alteration

effect occurs along the contacts in some places. Red feldspars are1,1

developed in the surrounding greenstones. Ahis was very evident on

claim K-56 just east of the concession boundary.

FRBUMIHARY OSOFIIYSIOAL INVESTIQATIOK3.

During the month of November 1943 come geophysical tests were

carried out in the area to study the reaction of known sulphide bodies

and determine if other deposits could be located by the methods em

ployed. Magnetic and self potential methods v/ere used for these tests.

Several profiles were made with the magnetometer between Kashabowee

and Shebandowan lakes with stations one hundred feet apart. Comparatively

small variations, of less than one hundred gammas, were found with an

occasional high of five hundred gammas. Detailed readings ofer two

sulphide showings on K-56 and Z-71 gave highs of 1500 gararas . '^hese

highs were due to magnetite not intimately associated with the ore as

several samples were non-magnetic. It was noted particularly that where

the magnetic highs occurred on the long profiles, shearings with some

disseminated sulphides were known to exist.

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These results indicated that the magnetometer v/as the ideal

instrument to carry out preliminary investigation, that sheared

.areas could be located and traced by it.

Self Potential work over the sulphide shows gave readings up

to 350 millivolts which is about the usual figure for massive sulphides

which are not wholly pyrite.

These results indicated that self potential work carried out

over the shearings, located by magnetometer v/ork, would pick out any

zones containing massive sulphides. It was decided to proceed with

the magnetic work during the winter months and check the results with

self potential methods when tie frost was out of the ground.

The work on the concession v/as started early in December with

a crew of four to eight men. It v/as first necessary to establish a

set of picket lines over the areas to be investigated. East west base

lines were cut at half mile intervals, the first half a mile south of

the C.N.R., and the second a mile south. North south lines were cut

at 400 ft. intervals along the base lines, '^he distances between them

v/as checked on each base line so their position could be accurately

mapped, l1 he s e picket lines were easy Jo cut in the northeast part of

the concession as the bush is sparae, however it was a different

matter around Burchell lake where the topography is very rough and

thero are many.-windfalls.

The magnetometer readings were taken at toe hundred foot

intervalsalong all the north south lines, ' ' 'he values are referred to

a base station at A .f- o, O which was assigned a value of zero.

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This station or another base, as a series of them had to be set up

to eliminate walking, was measured four times a day to correct for

daily variations in the magnetic field.

These magnetic values have been plotted on Maps No.2,3 and 4,

on a scale of 400 ft. equal one inch* The values are in gammas

and record the vertical intensity of the earth's magnetic field at that

point in comparison with its value at station A *f O* 0. Maps 3 and 4

show only contours drawn from the magnetic values.

DISCUSSION OF M/UaJETIC RESULTS.

The area of map No.S may be divided into two definite magnetic

zones. The first borders on the north shore of Shebandowan lake, is

three quarters of a mile wide and the length of the map area. It

probably extends some distance to the southwest where magnetic measure

ments; were not made. This area is underlain by Keewatin lavas of varying

composition and content of magnetite. The magnetometer values here rise

to more than three thousand garanas in many places. The contours indicate

banding in a N 700 E direction which is the strike of the rocks in this

area. Some iron formation occurs along the north shore line. These

magnetic anomalies are not flue to shearing but merely to the content

of magnetic iron in the various lava flows or parts of them.

The second zone extends north to the track. Most of the magnetic

values are under two hundred gaimns but in certain limited areas values

of two: thousand gammas were found. These anomalies are most interesting

because of their limited extent. Some of them occurred over draws and

valleys where shear zones could exist.

- 7 -

In the Burchell lake area map No.3 shows the magnetic anomalies south?

west of the Tip Top Mines and south of Burchell lake. The prevailing strike

of the country rock is indicated here by the strike of most of the magnetic

anomalies. The most interesting ones however are divergent to the general

strike; and are marked A, B, and O on tiie map. They occur close to the

contact of a major gatanite mass and are about parallel to the contact. Map

No,4 shows the anomalies found on the northwest side of Burchell lake where

the work was continued adjacent to another granitic intrusion. Here they

qre small with values to 500 gammas. A profile south east across the lake

was made to join the area with that to the southeast. Some of the values are

shown on this map. They are faitly high without much variation indicating

that the lake is underlain by fairly magnetic rocks and is not very deep

along this line*

SELF POTENTIAL RESULTS.

The self potential work was carried out in much the same manner as the

magnetic survey. The lowest value read was called zero and all other values

corrected to that base. It was originally decided to check only magnetic

anomalies with the self potential, but due to their extent, parts of the north

east map area were completely covered.

These results have been plotted on Map No.5. Most of the values are

well under one hundred millivolts and indicate very sparse dissemination of

sulphides. There is a general high area in the centre of the map sheet near

the lake shore where the readings are just over fone hundred indicating

disseminated sulphides. A heavier concentration is noted within this area

where the values are somewhat higher. As there is little overburden they

- 8 -

are not high enough for massive sulphides.

Two other self potentital highs occur in the northeast corner

of the concession, one on TB. S9901 and K-56 and the other on TB*29900

and TB. .89442. These occur in two draws and ithe values rise to four

hundred millivolts which could indicate massive sulphides. Detailed

work was done on these anomalies and will be discussed later*

The magnetic anomalies in the Burchell Lake area were checked

by self potential. Those referred to as A, B and O are apparently due

to concentrations of magnetite as the self potential values over them

were no higher than fifty millivolts* A small area of disseminated

sulphides is indicated on t he northwest shore of the lake but it is

of minor importance. ':No nap of these results has been made.

The detailed self potential work and resistivity profiles on

the anomaly on TB. 89900 are shown on itep No.6. A base line was cut

through the centre of the draw which coincided with the centre of the

anomaly and cross lines placed at one hundred foot intervals. Self

potential readings were taten at fifty foot intervals on all t bs se lines

and at ten foot intervals on eonB of them. The ten foot readings were

taken to find out if the anomaly was due to a series of narrow planes

or a continuous body across the width. The only break in the profiles

are on lines B and C where there is a slight decrease in the centre of

the anomaly. This could be due to a deeper ^uge along the centre of

the draw where more overburden would result in lower values. These self

potential values are caused by a body of material fifty to sixty feet

wide and four to five hundred feet long fairly close to the surface.

It is notable that the gradient of the profile is unchanged where itt

passes over the exposed rocks on either side of the draw. As mentioned

. 9 -

before the rock to the north of the draw is Keewatin Gabbro with

Keewatin lava to the south. The lava is slightly talcose and dips

vertical to the north. Detailed magnetic profiles showed a magnetic

body of the s ante width as that indicated by the self potential. These

profiles have been plotted over the diamond drill sections.

The anomaly was then checked with resistivity methods. Central

points set ups were made at points A^,B, O, D and E and resistivity

measurements made at fifty intervals on the cross lines for a distance

of five hundred feet in each direction.

The profiles are shown on Map No.6, the dashed line indicating

the readings to the north and the continuous line the readings to the

south of the central point. Lines A, B and C show the curve over the

anomaly lower than the curve away from it, viiile on line D, the curves

are about the same. Over line E the curves both lines rise fairly

consistently indicating the zone has been passed. On the whole the

values are not low enough to indicate massive sulphides but were

sufficiently positive to necessitate diamond drilling.

The self potential anomaly on the boundary between TB.29901

and K-56 was detailed in the same manner. The results have been drawn

up on Map No.7. This anomaly occurs in a wider draw and is underlain

in part by granodiorite. The self potential are somewhat higher here,hundred

rising to six millivolts at one point on line D. The anomaly embraces

a large area and has two centres. It was especially interesting because

a small sulphide show occurred on its strike, eight hundred feet to the

southeast. The high self potentials indicated the presence of graphitic

material.

- 10 -

The resistivity curves here are similar to tixose over the

other anomaly, the lines over the anomaly being lower than those away

from it but not sufficiently low to indicate massive sulphides. A test

profile was made over the sulphide show on K-56. The curve to the south

rises quite rapidly but that to the north stays flat from 200 to 400 feet

and has a value of 0.5 x 10 . This is only half the size of the

resistivities on line B. There is no magnetic anomaly in this area.

Diamond drilling was decided upon clue to the position of the

self potential anomaly with regard to the granodiorite and because of

its position on the strike of a sulphide deposit.

DIAMOND DRILLING.

Two holes were drilled in the north anomaly. The NCuljras located

one hundred feet north of the base line on line B and drilled at an angle

of 45O to the south. The hole cut 121 feet of gabbro, 95 ft. of talc

schist and 58 feet of medium lava. The talc schist contains very fine

disseminated pyrite and chalcopyrite which could not be seen without

the aid of a glass. There are also fine magnetite crystals distributed

through it. The copper values averaged less than one fifth of one per

cent.

Hole Ncu2 was located one hundred feet north of the base line

on line C and drilled to the south at an angle of 600. This hole cut

126' of gabbro, 98* talc schist, 6" of graphitic ash rock at a depth of

B34* and 69* of medium lava. The schist was less talcose and contained

less sulphides. The graphitic rock is important in that it probably

caused the self potential anomaly in combination with any sulphides

present. The magnetite crystals explain the magnetic anomaJy, while

the talc schist with the sulphides present would lower the resistivity

- 11 -

values a certain extent. In order to explain the size and regularity

of the self potential anomaly it seems likely that there is fine

disseminated graphite in the zone besides the narrow band of graphitic s

rock.

Hole No.4 was drilled in the south anomaly. It is located

75' north of the base line on line A -t- 2, and me drilled at 45O to

the north. It cut 35' of granodiorite, 127* of Keewatin complex

including acid lavas, basic lavas and tuffs with some disseminated

pyrite and two notable graphitic sections. The hole then cut 30* of

gabbro.

Hole No.6 was located 230* southeast of hole No.4 and drilled

at 450 in a northeast direction. It intersected 92* of granodiorite

and238* of Keewatin lavas. A 20* gabbro dike was cut at 235* preceded

by 25' of talc schist. There was some pyrite mineralization and sons

sections were graphitic.

The same physical phenomena occur here to explain the geophysical

results as in the north anomaly. The lack of a magnetic anomaly is borne

out here as no magnetite was found in the drill-core.

OONSLUSIONS.

The results obtained from the investigations in this area have

been negative from an economic viewpoint but oansiderable information

has been gathered to aid in future exploration by geophysical methods.

Each district presents new problems to the geophysicist and often

considerable time must be spent solving these. Geophysics is tied 80

closely to geology in prospecting that detailed geological work is

necessary for the best geophysical interpretations. This work can be

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carried out most satisfactorily in the sunnier tine when the mar J mum

number of outcrops are exposed.

" •••••vx

ALDERMAC COPPER CORPORATION LTD.MINE

P. O

SHERBRC

52B09NW0011 63.4366 KASHABOWIE LAKE 900

Seventeenth, 1944.

Mr. H. C. Rickaby, Deputy Minister of Mines, Parliament Bldgs., Toronto, Ont.

/..-•J

(

Dear sir:-

Enclosed is a report describing the work done on the Kashabowie Concession granted tp this Company December 1st, 1942.

AS may be seen there'were no mine making discoveries but I think that the concession points the way to future mineral search methods. Qwite Ipoge areas are needed for this type of work when there is no advance information available. Most of the ground is drift, covered and seems to never have been attractive to prospectors. To/OD effective geophysical work, a wide range has to be available unless the locale is amenable to close geo logical examination. It is expensive and not worth doing if claim scalpers ^re in a position to stake nuisance claims.

On banalf of Aidermac, I wish to thank your Department for co-operation and for taking a forward move in prospecting that important part of the country's "unlimited mineral resources" that is e/f actively concealed by drift.

Yours truly,

A. V. CORLETT.

AVC/AL.

.c/V-- March 23, 1944

Aldermao Corporation, Ltd.,P.O. Box 159,SHERBROOKE, Quo . l

Oentlomen : ATTOITIOH i KR. A.V. CORLBrr. ' i

I beg to Qoknowledge rooelpt of the report

covering the geophysical work done on tho Kaehabowle Concession,

end I wish to thank you for snmo .

HCHtB. Vory truly youro,

H. O, Rickoby,

Deputy Mlniatar .

ALDER MAC

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