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20
n ARIS SUMMARY SHEET o no LJ1str1ct Geolog1st Sm1thers SSESSMENT REPORT 17493 l1ROPERTY LOCATION J CLAIM S PPERATOR S l UTHOR S REPORT YEAR GEOLOGICAL SUMMARY JWORK DONE J J r J l I J l J Off Confidential 89 06 16 MINING DIVISION Atlin Reef LAT UTM NTS Reef Homestake Min McIvor D F 1988 17 Pages 59 35 05 08 6605762 104N12E LONG 577746 133 37 24 Dev permo Pennsylvanian Cache Creek Group volcanics and Permian ultramafic intrusive rocks have structural contacts with associated hydrothermal alteration silicification carbonatization containing sporadic quartz veins weakly anomalous in gold Geological GEOL 350 0 ha Map s 1 Scale s 1 2000 LINE 22 5 km ROCK 5 sample s ME

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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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NTS

LATITUDE

LONGITUDE

OWNER

OPERATOR HOMESTAKE MINERAL DEVELOPMENT COMPANY LTD

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DATE

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

33

34

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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