l1roperty - aris.empr.gov.bc.ca
TRANSCRIPT
nARIS SUMMARY SHEET
onoLJ1str1ct Geolog1st Sm1thers
SSESSMENT REPORT 17493
l1ROPERTYLOCATION
JCLAIM S
PPERATOR S
lUTHOR S
REPORT YEARGEOLOGICAL
SUMMARY
JWORKDONE
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Off Confidential 89 06 16
MINING DIVISION Atlin
ReefLAT
UTMNTSReef
Homestake MinMcIvor D F
1988 17 Pages
59 35 0508 6605762104N12E
LONG
577746133 37 24
Dev
permo Pennsylvanian Cache Creek Group volcanics and Permian
ultramafic intrusive rocks have structural contacts with associated
hydrothermal alteration silicification carbonatization containingsporadic quartz veins weakly anomalous in gold
GeologicalGEOL 350 0 ha
Map s 1 Scale s 1 2000LINE 22 5 km
ROCK 5 sample s ME
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LATITUDE
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OWNER
OPERATOR HOMESTAKE MINERAL DEVELOPMENT COMPANY LTD
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LOG Nf1 QQ1 RD
IICTrU
FILE NO
SUM RY REPORT GEOLOGICAL MAPPING AND
LITHOGEOCHEMICAL SAMPLING PROGRAMSON THE REEF CLAIM EZ VENTURES PROPERTY
WEST GROUP OF CLAIMS
ATLIN MINING DIVISION
BRITISH COLUMBIA
FILMED
GEOLOGICAL BRANCHASSESSMENT RJ1 PORT
l04N 12E
590 35 NORTH
133038 WEST
HOMESTAKE MINERAL DEVELOPMENT COMPANY LTD
DUNCAN MCIVOR
JANUARY 1988
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TABLE OF CONTENTS
PAGE
1 S Y 1
2 INTRODUCTION2 1 SCOPE OF REPORT
2 2 LOCATION ACCESS AND PHYSIOGRAPHY
2 3 LAND STATUS
2 4 GENERAL GEOLOGIC SETTING2 5 PRELIMINARY ECONOMIC ASSESSMENT
2 6 EXPLORATION HISTORY
2 7 WORK COMPLETED
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3 DETAILED TECHNICAL DATA
3 1 GEOLOGIC MAPPING
3 1 1 METHODS EMPLOYED
3 1 2 RESULTS AND INTERPRETATION
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3 2 LITHOGEOCHEMICAL SAMPLING
3 2 1 METHODS EMPLOYED
3 2 2 RESULTS AND INTERPRETATION
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4 ITEMIZED COST STATEMENT AND ALLOCATION OF EXPENDITURES
SELECTED BIBLIOGRAPHY
AUTHOR S QUALIFICATIONS
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LIST OF FIGURES
1 LOCATION MAP ATLIN AREA
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2 LOCATION MAP REEF CLAIM
3 GENERAL GEOLOGY OF THE ATLIN AREA
I I LIST OF APPENDICES
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1 1 2000 GEOLOGICAL PLAN MAP OF PORTIONS OF THE REEF CLAIM
2 ICP GEOCHEMICAL DATA
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1 SUMMARY
The Reef Claim is situated 4 kilometers east of the t01o11 of Atlin in
northwestern British Columbia During the period June through October 1987 as
part of a large exploration effort in the Atlin area Homestake Mineral
Development Company Ltd established 22 5 line kilometers of cut line grid on
the property from which geological mapping and lithogeochemical samplingprograms were conducted
The mapping program discovered only t O small areas of outcrop exposure
along the shores of Pine and Spruce Creeks Encountered 1itholigies included
serpentinized ultramafic and andesite with minor occurrences of feldsparporphyry dyke rocks There js insufficient outcrop exosure to allow
interpretation of the property geology although regional airborne magnetic data
suggest that the majority of the ground is underlain by massive homogeneousandesites of the Cache Creek Group
Five rock samples were collected from the property during mapping and
analyzed geochemica1ly for Au and via ICP for a suite of 30 elements Only one
sample from andesite containing 10 thin carbonate stringers returned even
weakly anomalous gold values that being 69 ppb Au
2 INTRODUCTION
2 1 Scope of Report
This report briefly summarizes the exploration work conducted byHomestake Mineral Development Company Ltd on portions of the Reef Claim duringthe period June through October 1987
2 2 Location Access and Physiography
The Reef Claim is located 4 kilometers due east of the town of Atlin
in northwestern British Columbia see Figures 1 and 2 Access to the propertyis excellent with several 4WD bush roads extending west from the Spruce Creek
Road and crossing the property The portion of the Reef Claim on which work was
performed this year is bounded on the north by Pine Creek and to the south and
west by Spruce Creek The majority of the claim is overlain by a thick mantle
of fluvial and glacial sediements and outcrop exposure constitutes less than 17of the property area The majority of this exposure is along the two
aforementioned creeks The claim is densely wooded with mature spruce and
jackpine the most common vegetation Relief on the property is by local
standards low with perhaps a maxium of 30 meters difference between the creek
valleys and higher plain between the creeks
2 3 Land Status
The
collectivelylate 1988
20 unit Reef claim is part of a larger group of claims
known as the West Group all of which are in good standing until
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2 4 General Geologic Setting
The Reef claim lies near the western edge of the northwest trendingAtlin Terrane which is underlain by Upper Paleozoic oceanic crustal rocksMonger 1975 These rocks are correlated with the Cache Creek Group rocks of
southern and central British Columbia
Within the Atlin Terrane andesitic to basaltic flows are overlain bycherts and thick shallow water carbonate rocks Discordant granitic plutonsranging in age from Late Jurassic to early Tertiary locally intrude the
stratigraphy Some remnant Tertiary volcanics and sediments are found within
the area
Also within the At1in Terrane and co eval or immediately post datingthe Cache Creek group rocks are large ultramafic bodies which define a discor
dant belt trending west across the tectonic fabric of the terrane The ultrama
fic bodies are commonly intensely serpentinized and in placed extensivelyhydrothermally altered to a listwanite like assemblage of silica carbonate
mariposite fuchsite
The Reef claim is believed to be underlain predominantly by rocks of
the Cache Creek Group andesitic to basaltic flows with minor intercalated
meta sediments with some intrusive ultramafic rocks in the extreme north and
south portions of the property Figure 3 illustrates the general geology of
the Atlin area and the location of the Reef Claim within that geologic setting
2 5 Preliminary Economic Assessment
The majority of known lode gold mineralization within the Atlin Campis associated with intensely altered si1ica carbonate mariposite fuchsite
ultramafic rocks proximal to their fault bounded or intrusive contacts with
rocks of the Cache Creek Group
The mineralization is almost exclusively hosted in
quartz quartz carbonate veins and vein stockworks within these altered packagesof rocks occurring either as often spectacular free gold or in intimate
association with gangue sulphides such as pyrite chalcopyrite arsenopyritesphalerite galena and sulfosalts pyrargyrite tetrahederite
The Reef claim in as much as it is beleived to be underlain bycontacts between ultramafic rock in the north and Cache Creek rocks through the
central portion of the property may host areas of hydrothermally alterated
ultramafics along these contacts which may in turn host potentially auriferous
quartz quartz carbonate vein stockworks
The Reef Claim lies 5 kilometers west and along strike from
Homestake s Yellowj acket zone of gold mineralization which is hosted in a
geological environment similar to that discussed above
2 6 Exploration History
Prior to acquisition by Homestake Mineral Development Company Ltd no
recorded work has been filed on the claim
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2 7 Work Completed to Date
During the period June through October 1987 the following work was
completed by Homestake HMDC on the property
22 5 kilometers of grid were cut on the property to fascilitate
geological mapping
geological mapping at a scale of 1 2000 was completed on the
property
5 samples were collected from the property and analyzed for 30elements via ICP and for Au via standard fire assay and A A
methods
The details of this work are outlined in the next section of this
report
3 DETAILED TECHNICAL DATA
3 1 Geological Mapping
3 11 Methods Employed
As mentioned 22 5 line kilometers were cut on the propertyto provide control for geological mapping and any potential future work The
grid was an extension of the Yellowjacket grid bordering the property to the
east and involving extending a baseline 2 kilometers across the southern
portion of the claim Baseline orientation was 0700 2500 from which crosslines
at 3400 1600 were established at 100 meter intervals Stations were established
at 20 meter intervals along each cross line
In the course of mapping all encountered outcrops were
physically tied into the grid and their perimeters followed via hip chain and
compass The provided very accurate establishment of outcrop locations
Detailed notations as
orientation and the presence or absence of
and mineralization were made in the field
to outcrop lithology structural
any significant alteration veining
All pertinent topographic and geomorphic features were also
accurately tied into the grid
The geology map of the property at a scale of 1 2000
appears in Appendix 1 of this report
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3 1 2 Results
Lithologies
Outcrop exposure on the property constituted less than 17
occurring only sporadically along Pine Creek in the north and Spruce Creek in
the South Four lithologies were encountered during mapping and below are
brief descriptions their numbers correspondin with those of the map legend in
Appendix 1
Unit 2 Serpentinized Ultramafic
This unit occurs as a very fine grained to aphaniticpredominantly massive bright green to black strongly serpentinized rock the
serpentine content varying from approximately 307 to 1007 The rock weathers a
characteristic tan to buff colour and is generally very strongly magnetic The
unit is in places porphyritic with small 2 3mm weakly steatized pyroxene
crystals which stand out in relief on weathered surfaces
Where weakly sheared see map talc alteration increases at
the expense of serpentine
Unit 5 Feldspar Porphyry
This lithology outcrops as thin dykes cutting andesites in
the northeast corner of the property The rock is comprised of an intermediate
massive very fine grained to aphanitic groundmass with a highly variable
phenocryst content from nil to 207 Phenocrysts are predominent1y eudedra1 to
subhedral white plagioclase
Unit 9 Andesite
This unit which outcrops along both Spruce and Pine Creeks
is believed to underlie the majority of the property It is characteristicallymassive dark green aphanitic and uniformly unspectacular
Unit 12 Argillite Graywacke Quartzite
In the northeast corner of the property a thin wedge of
fine grained pink granular quartzitic appearing rock cuts a serpentinizedultramafic outcrop This may either be a broken and rafted xenolith of
quartzite or a recrystallized felsic dyke
Structural Stratigraphic Setting
The poor exposure on the property makes interpretation of
the structural and stratigraphic relationship of the property geology difficult
but based on what outcrop is present and the regional magnetic data it would
appear that
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the majority of the property is underlain by a thick pile ofintermediate andesitic volcanics of the Cache Creek GroupRegional orientation of these volcanics based on
aeromagnetic data and observed orientations elsewhere in theAtlin area is predominent1y east west with vertical tosub vertical dips
This volcanic package has been locally intruded byultramafic rocks to an unknown extent as there is insufficient ground exposureor detailed magnetometer coverage to allow delineation of these units
3 2 Lithogeochemical Sampling
3 2 1 Methods Employed
In the course of mapping 5 bedrock samples were collectedfrom the property and forwarded to Acme Analytical Laboratories in Vancouverfor 30 element geochemical ICP analysis All samples were also geochemicallyanalyzed for gold by standard fire assay and atomic absorption methods
Obviously the purpose of the sampling program was toevaluate the economic potential of the property and all exposures containingany form of alteration mineralization or veining were sampled In addition to
the gold analyses the wide spectrum of elements analyzed for by the ICP method
provides some very useful trace element geochemical data Gold mineralizationin the Atlin camp is often associated with highly elevated contents of Cu ZnPb Sb As Cd and Ag all of which are part of the ICP package Elevatedcontents of these elements even in the absence of gold anomalies may serve as
pathfinders to gold mineralization
The ICP geochemical analytical results appear in Appendix 2
of this report All sample locations are plotted on the enclosed geology mapAppendix 1 followed by the sample gold content in ppb
3 2 2 Results
Of the five samples collected during mappingreturned even weakly anomalous gold values that being
only one
Sample EZ 33226
A grab sample of andesite in the northeast corner of the
property which locally contained 5 107 thin carbonate stringers with 17disseminated pyrite returned an assay of 69 ppb Au and 0 5 ppm Ag This area
of exposure warrants a more vigorous sampling program to assess the significanceof the weakly anomalous gold value
All other samples returned insignificant Au and associatedtrace element values
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4 0 ITEMIZED COST STATEMENT AND ALLOCATION OF EXPENDITURES
4 1 Itemized Cost Statement
The following expenses were incurred as a direct result of the
exploration work described in this report
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1 Linecutting Costs
22 0 kilometers @ 375 00 per kilometer
as invoiced by Eaglehead Exploration
2 Salaries and Wages
Duncan McIvor
1 day December
@ 115 00 day
Report Preparation6 1987
Joanne Bozek
5 days August@ 85 00 day
3 6 11 1987
Phil Southam
4 days August@ 85 00 day
3 6 1987
SUB TOTAL
207 BENEFITS ETC
TOTAL
3 Analytical Costs
5 samples analyzed for Au 30 additional
elements @ 14 25 samp1e
4 Food and Accommodation Costs
@ 35 day per man x 9 man days
5 Transportation Costs
Fuel and Maintenance on Vehicles
@ 25 day x 5 days
6 Miscellaneous Field Equipment Costs
flagging tape topofil sample bags etc
TOTAL EXPENDITURES
6
8 250 00
115 00
425 00
340 00
880 00
176 00
1 056 00
71 25
315 00
125 00
50 00
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4 2 Allocation of Expenditures
These costs were all incurred and are all allocated to the Reef Claim
2334 part of the West Group of claims Application of these expendituresto claims of the West Group is as outlined on the Statement of Exploration and
Development
CLAIM REC NO UNITS REC DATE ALLOCATION
REEF 2334 20 11 07 84 9 867 25
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SELECTED BIBLIOGRAPHY
Aitken J D
1959 Atlin map area B C Geological Survey of Canada Memoir307
B C Department of Mines Annual Report 1901 p 757 759
1902 p 9811903 p H38
1901 p H44
1905 p G77 78
1933 p A78 A79
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Larkin Curtin and Hubert
1974 The Geochemistry of Gold in the weathering cycle U S
Geological Survey Bull 1330
McIvor D F
1987 Summary report of mineral exploration activity on the Pictou
Property Atlin Mining District British ColumbiaHomestake Mineral Development Company Ltd in house report
Monger J W H
1975 Upper Paleozoic rocks of the Atlin Terrane Northwestern BritishColumbia and South Central Yukon Geological Survey of Canada
Paper 74 7
DRonning P A
1986 Summary Report Diamond Drilling and Geophysical work Arent 1
and Arent 2 Beama and Adjacent Claims North and South Claim
Groups Yellowjacket Property Atlin Mining Division HMDCassessment report on file at the B C Ministry of Mineso
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AUTHOR S QUALIFICATIONS
I
JI Duncan Forbes McIvor do hereby state that
I am a graduate of the University of Waterloo and hold an
Honours Bachelor of Applied Science deRree
J I have been practising my profession as an explorationgeologist on a full time basis since 1982
II
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I have personal knowledge that all information presented in
this report is true and accurate
vVl4eDuncan McIvorl
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