52H84NEaa27 63.17)1 LAC DES ILES 010

LAC UiS ILffi CLAIM OBOU?

S O l T") l f

GUNNKX LIMITED

Introduction

is H Buiuiuttry report of exploration work in the Lac dee

Iles area during 19&3-

Duriug the latter part of June, W. Baker and O. Moore made a

reconnaissance prospecting trip and fouad widespread low-grade copper-nickel

mineralization in ultra basic rocks B out h of Lac des Iles. The indications

were sufficiently encouraging to warrant additional time being spent i a the

area and subsequently u block of 175 contiguous claims were staked, with

considerable detailed prospecting, geological mapping, and geophysical work

on about 38 of them.

There has been no previous geological work done in the immediate

area and a considerable part of the prospectors' tine was spent iu IMS rely

attesting to establish the boundaries of the favourable ultrabasic intrusive

muss. It I B also of interest that no evidence has been found of any previous

prospecting activity. Tue area of favourable geology apparently was overlooked

by prospectors and geologists because it lies on a height of land and there are

no canoe routes through it.

Property k Location

The property consists of 17^ contiguous claims numbered as follows:

TB 107b^ to 107868 inclusive TB 107872 to 107907 inclusive

.2

TB 108122 to 108126 inclusive TB 108155 to 108184 inclusive Tli 108521 to 108564 inclusive TB 108707 to 108733 inclusive TB 109361 to 109378 inclusive

They are located sixty miles north of Fort William. The only means

of access is by airplaue which ordinarily land on Camp Lake which is about one

mile in length and is located near the centre of the property.

A new all-weather roud, called the Spruce River Boud, takes off from

Highway 17 about three miles east of the city limits of Port Arthur and passes

11 to 12 miles eaiit of the property. An access road to the property would be

fairly easy to construct as the Intervening ground is mostly veil drained and

gently rolling.

Diamond drilling equifntent can be most economically flown in from

iidmona., ./a Lake which IB on trie Spruce River Road. This lake is 45 to 50 miles

from Port Arthur by truck and is 22 air miles to the camp, thus it is within

distance for ths minimum flight rate.

Physical Features

The surface of the gabbro complex body lying south of Lac des Iles

forme a plateau which rises steeply about 200 feet above Lac des Iles and

slopes gently to the west, south and east. The surface in the vicinity of the

mineralized eoues is mostly gently rolling with a shallow cover of overburden

consisting mostly of large boulders. There is little surface water except for

the few scattered ponds. The topography is such that the whole area could be

completely drained by one or two ditches.

General

There is no record of previous geological vork in the immediate area.

A compilation of the existing information on the surrounding areas is shown on

Ontario Department of RI ne B Preliminary Geological Map No. P.1&7, Lac dee

Iles Sheet. However, this iw*p la blank in the area la vhich the claim group

le located. Aeroiaagnet le Survey Map No* 2099G shows anomalous readings over

thw ultrabasic Intrusive body aud work on the ground Indicates that this map

represents the broad geological picture vlth a fair degree of accuracy.

Table of Formations;

DiabaseFine grained basic dikesQuar t x -.feldspar porphyry dikesOranite

Gabbro complexPeridotiteGranite-gneiss

Oranite -Gneiss;

The body of ultrabasic rock referred to as the gabbro complex Is in

contact with granite-gneiss on the vest. This gneiss generally is a medium-

grained light to dark gray rock vhich commonly has a ribbed appearance due to

differential erosion. Most of the banding is from a fraction of an inch to a

fev Inches thick and iu due mainly to the differences in the ratios of light

to dark minerals. Very little vork has been done in this area, but the gneiss

appears to be about one mile in width and to grade into massive gray granite to

the vest. The age relationship of the granite-gneiss with the gabbro is unknown.

Peridotite;

A body of peridotite from 1^ to 2 miles in diameter is believed to lie

under the main part of Lac des Iles. This rock can only be observed at scattered

locations due to the lake and a thin diabase sill capping vhich covers most of the

higher ground. It i e u rusty weathering fine to medium-grained rock and is

considerably serpentini^ed. Tne magnetite content is high and therefore the

aeromagnetic anomaly probably delineates its boundaries. Minor fractures are

.1*

very common and some of the outcrops are highly sheared. Sulphide* are very

fine and sparse but assay results shov low nickel values of about 0*1 to 0.2Jfc.

Gabbro Complex;

A body of mafic rock of various phases consisting of gabbro, norite,

anorthosite and pyroxenite extends in a south-southwest direction from the aain

body of Lac des Iles peridotite. This ultrabasic body appears to be about six

mil*s in length and its southern boundary is about four miles south of Lac des

Iles. It appears to have a maximum width of a little nore than two miles. In

addition to variations in mineral composition It varies from fine grained to

very coarse grained pegmatitic phases. Its magnetic properties are also very

erratic. Much of the rock carries no appreciable magnetite, but in acme areas

the magnetite content is over 50JG. All the occurrences of copper-nickel of any

Importance that have been found to date lie within this assemblage of ultrabasic

rocks.

gabbroic -Gneiss:

The only location where this rock type has been located is near the

southeast end of Centre Lake. It consists of a typical gabbro which has been

intruded by narrow acid dikes in a lit-par-lit fashion. It l* uncertain whether

this is a distinctive rock type or if it is a part of a fault cone with the narrow

acid dikes intruded along the planes of shearing.

Oranite;

On the east side the gabbro complex is in contact with a body of massive

medium grained biotite granite which is pinkish-red to red-brown in colour. This

granite has only been examined near the gabbro contact and here it is distinctly

porphyritic in texture. It is unknown whether the main body of the granite also

has the porphyritic character.

Three outcrops were found where the granite -gabbro contact is veil

exposed and it le definitely entablished that the granite is intrusive into

the gabbro. On two outcrops it vac possible to determine the dip of the

contact and t lie ae were 70O and &00 respectively to the east towards the granite

body.

, Porphyry Pike e;

Acid dikes from a few inches to a few feet in width are sparsely

scattered throughout the gabbro body. They are medium grained and gray to pink

in colour with veil de ve I oped quartz and feldspar phenocrysts. They are probably

related to the granite uiat.ii to the east.

Fine-grained Basic Pikes;

Widely scattered throughout the gabbro complex are numerous fine-grained

basic dikes. These dikes ure all small, being f rosa about one inch to a oiaxliauia

of a couple of feet in width. They are very irregular in outline and pinch and

swell rapidly.

A thin section examination of a specimen of this rock shoved it to be

e o Ben t i ally a uixture of plagioclase and pyroxene in the ratio of 70:30.

Wherever they have been observed these dikes are post sulphides.

Diabase ;

Most of the northern portion of the claim group is covered by a capping

rock consisting of a Keweenawan diabase sill. This is aprt of the diabase which

o ve r li e B much of the area surrounding Lake Nipigon to the east. On the islands

and shore of Lac des Iles this sill is apparently only a fev feet thick and nottt

of the surface depressions are windows through the diabase to the underlying

formations.

The Keweenawan dluba.be as exposed in this area is a medium to coarse-

grained rock, weathering to a pule brownish colour but generally exhibiting a

.6

characteristic fresh appearance. The lover portions of the flow become fine

grained near the contact, with the underlying rocks. The rock commonly has a

good ophitic texture, but in places it is uon-ophitic and resembles a gabbro.

Small bodies of diabase also occur within the gabbro complex south of

Lac des Iles. These have near horizontal contacts with underlying gabbro and

some shearing is exhibited ut these contacts.

Detailed Mapping

A base line 15,000 feet in length and bearing N.25OE. was run from the

north shore of Two Island Lake to the south shore of Lac des Iles. Picket lines

were turned off at ^00-foot intervals and in the areas of the aain showings inter

mediate lines at 200-foot intervals were established. The cross line* were

extended so as to cover a strip ^,i?00 feet in width. This area covers all, or

the major part of 3^ claims, amounting to about 20Jfc of the total area of the

property.

Mapping was carried out on a scale of 200 feet to the inch by traversing

along the lines and between the pickets of adjacent lines by pace and compass. So

far as possible all outcrops were sketched and features of Interest recorded. A

large part of the area is covered with overburden, but much of this cover appears

to be very light and when more time it available much more rock could be uncovered.

In order to map the various phases of the gabbro complex a detailed

study will be necessary and there was not sufficient time to attempt this. How

ever, it is suggested that this detailed work is well warranted for next season.

There are numerous lineaments recognizable on the aerial photographs

oui the more prominent of these have been plotted on a base map on a scale of one

inch to 400 feet. A transparent overlay showing these lineaments has been

prepared r i,'r the detailed geological map of the known mineralized zones.

.7

Two of these lineaments appear to be regional structures. A ravine

which strikes northfcuut uud pubfacs through Narrow Lake in the southeast corner

of the property extends for a number of miles and apparently represents a major

fault. Another very strong structure causes the steep and straight line of the

south shore of Lac des Iles.

Within the limited area that hag been mapped in detail some of these

lineaments art; recognisable ut topographic depressions and shearing on the lower

edges of outcrop** lends support to the view that they are caused by faults. Other

persistent linear** are not rcco^aizabJe on tiie ground, and they may be simple or

diKe-filled fracture**.

l believe that it is significant that there is a pronounced concentration

of these photo linear s in the areas where the most important mineralized zones have

been i\ and. Of oven wore significance is the fact that there are other nearby

overburdened areas where the air photos show a similar concentration of lineaments,

A comparison of these photo-linears with the known geology indicate that the known

mineralized zoaee are nearly all situated close to the Junction of two or more of

the lineaiuents.

Extending over u lentil of about two miles in a south-southwest direction

are a number of irregular wluerulized zones carrying pyrrhotite, pentlandite and

chalcopyrite. A thin section utudy of specimens from two separate zones ident

ified them as being composed of plagioclase feldspar and hypersthene, thus class

ifying them as norite. The grain size of the noritlc rock changes sharply in a

Bhort distance from fine-grained to a coarse-grained pegmatitic material and the

relative mineral constituents also b how abrupt changes, but as far as is known at

this date thouc changes huvu no bearing on the abundance of the sulphide minerals.

The sulphides occur as finely disseminated grains, as coarse localized

clusters, or, more rarely, as fracture fillings. j&auination of thin sections

.d

under microscopic low power indicates clots of sulphides consisting of bright

yellow chalcopyrite and a pale yellov complex of tvo minerals. The chalcopyrite

occurs ae sharply defined cryatals and areas and is possibly the last mineral to

have crystallized. With a higher power the pale complex can be more readily

resolved Into its tvo components, a dominant creamy yellov mineral and a pinkish

creamy yellov one vith a darkur complexion. The latter occurs in small blocky

crystals that range down to 0.05 urns, in diameter, and In larger fractured

individuals up to l turn. long. Both minerals are medium in hardness. The paler

mineral has cleavage and is isotropic vith crossed nicols. The chemical analysis

of a tiny fragment of this mineral shoved 3M" nickel and a high content of iron.

These data identified the mineral as pentlandite. The darker mineral is isotropic

and this feature, together with its pinkish colour and a suggestion of magnetism,

indicates pyrrhotite. In the sections examined, the percentage ratio of chalcopy

rite, pentlandite tt;...! pyrrhotite is roughly 30i50*20. The ore minerals are

moderately pocked with gangue. Although the pentlandite and pyrrhotite are closely

mixed, they are not intimately so and the tendancy is to a blocky or bladed type

of crystallization. The genetic sequence is suggested protem to be pyrrhotite,

pentlandite and chalcopyrite.

The relationship of the sulphides to the gangue appears to be more or

less contemporaneous. No evidence was seen of secondary features such as shearing,

schistosity or lines of weakness where solutions may have penetrated, nor vat there

any evidence of replacement of other minerals. Most of the sulphides observed

were located between or in contact vith grains of hypersthene, suggesting an

affinity between them, although some of the sulphide was entirely surrounded by

feldspar.

A Zone;

This mineralized zone lies on Claim 107901, at the northwest side of

Shorty Lake. It h&a been opened up by tvo trenches 220 feet apart. It has a

700 to

BtrlJte of 8.65^. One trench la k6 feet in length and appears to expose the

full width of the zone. The second trench le 10 feet in length and the full

vidth of the mineralization le not expoted.

The norite varies from fine to medium grained and the sulphides are

evenly distributed.

B Zone;

This zone lies about 3*000 feet southwest of A Zone on Claims 107873-

107907. Sulphide mineralization occurs on a number of outcrops over

aii area several hundred feet la diameter. The mineralization occur B both as

evenly disseminated grainti and in massive form, filling narrow fractures. The

neritic gabbro in this area is veil foliated and shows a fold swinging from noth-

east to northwest, as indicated on the map. The dip of the foliation is from

to the east.

Sulphide mineralization here is associated with a variable luagnetite

content up to 2^ of the rock. This magnetic zone is well outlined on the magnet

ometer survey map. Magnetite occurs as small to medium sized grains in dissemin

ated form, but generally exhibiting a banded appearance which may reflect a layering

within the gabbroic norite complex.

C Zone;

Thin zone lies about 1,500 feet 8.25^. of the B Zone on Claims 107874

and 107656. It has been opened up in a number of small pits and all sulphides

o exposed are sparsely disseminated in medium-grained neritic gabbro. The

vieible zone is 500 feet in length and in excess of 100 feet in width, striking

almost east-west. It may continue beneath the diabase capping to the west, but

trends into t'wsuup and low ground in an easterly direction. The so-called B Zone

may represent a northeast swing in strike of the C Zone.

.10

D Zone:

This tone lies about 2,000 feet S.2b0W. of the C Zona on Claim* 108175

and 10dl?6. It also has been exposed in a number of pits over an area of 300

to kOQ feet in diaeneion but, due to overburden, its full extent and its attitude

it unknown.

The rock is aedium to fine-grained neritic gabbro and the sulphides

occur both in a finely disseminated form and as coarse blebs. This lone is fairly

typical of much of the mineralisation south of Lac des Iles, and samples from here

vere used in much of the thin section and polished section microscopic examination.

K Zone;

This gone lies about 1,000 feet southwest of the B Zone on Claim 107674.

It has been opened up in three pits over an area of 130 by 60 feet. The rock is

mostly very coarbe-grained and varies in composition from a neritic gabbro to

phases composed entirely of pyroxene.

The mineralised area is associated with a narrow northeast striking

draw, and there could conceivably be sons structural control of the sulphide

mineralization at this point.

F.Zone;

This zone lies about 1,000 feet 8.25^. of the S Zone, and near the

west boundary of Claim 107874. The rock type and mineralization is similar to

that of the E Zone, and there may in fact be some direct spacial relationship

between the two.

Q Zone;

This appears to be the largest cone, being at least 600 feet in diameter,

and with the exception of localised areas, is also the lowest in sulphide content.

It lies on Claim 1081^5 on the east side of Centre Lake and about 2,^00 feet south

of the D Zone. The rock is a fine to medium-grained norite and the sulphides are

evenly and sparsely disseminated. Both the appearance of hand specimens and two

polished sections indicate the sulphides to be of syngenetic origin.

.11

H Zone;

Lying about midway between the B and C Zone* are three small outcrops

over a length of about 50 feet that have been designated as the H Zone. The**

outcrops are on the edge of a swamp which extends to the east and the presence of

sulphide-bearing float in the swamp indicates that the outcrops could be on the

edge of a cone of considerable size. It is possible that these outcrops nay be

part of the C 2-one, the exposed part of which lies about 600 feet away.

Geophysical jit geochemical Surveys

Magnetoiueter, electromagnetic and self-potential surveys and soil

sampling procedures have all been carried out over the known mineralized tones and

none of these techniques has given positive results. A brief summary of the

results follows.

Magnetometer Survey:

The distribution of magnetite within the gabbro complex is erratic and

it appears that the scattered heavy concentrations of nagnetite mask the bodies

of sparsely disseminated pyrrhotite. Indeed it appears at this date that the

sulphide-bearing fconea always have a low magnetic susceptibility and that where

appreciable magnetite is present there is an absence of nickel and precious metal*.

However, the sections that are high in magnetite often carry low but uniform

copper values. A forty-foot long outcrop on the south side of Walter Lake carries

about O.jyjt Cu in a rock that is 50*jL magnetite, but there is no nickel or precious

metals. Two or three other widely separated outcrops also exhibit this same

mineral relationship.

Certain Btruetoral trends that are indicated by the magnetometer survey

may eventually prove to be of use. There seems to be a rough correlation between

the area of high luagnetic intensity surrounding Walter Lake and the higher magnetic

.12

area to the southwest of Centre Lake with the aerial magnetic information. How

ever, there is no obvious correlation between disseminated sulphide zones and the

magnetic anomalies.

The survey instrument used le an ABfM model MZ4 torsion wire magnetometer

reading total field intensities with a scale division of 10.5 gammas. Please note

that to facilitate plotting, all calculated readings have been divided by a factor

of 10.

iSlectromagnetlc Survey;

Tliis tmrvey wue run with a Minigun horizontal coil two-phase instrument

with a 200-foot connecting cubic.

It WUB recognized that the sulphide mineralization in the known showings

was too idsseiiiinated to be a conductor. However, it was thought possible that

there might be heavier concentrations in overburdened ground which might be

detected, arid therefore tin E-M survey was carried out in the vicinity of some of

the known mineralization. No true conductors were locautd due primarily to the

magnetite content and to overburden conditions.

Self-Potential;

The self-potential method gave results that can but be described as

indefinite. Certainly it gave no results positive enough with which to locate a

drill hole. It is believed that the type of overburden may have been a limiting

factor. Over lar^e purts of the survey area the surface is composed of a mass of

large boulders with open interspaces, and the whole is covered with grass and

brush. T. .efore, at many atations the probes probably had poor contact. In

view of these conditions it might be worth while to try a trial traverse witL the

self-potential on the snow.

G e oc l taiiiic al Survey:

Boil sampling was carried out over the entire grid on 100-foot centres

with the exception of those areas where boulders precluded proper sampling proce

dures.

.13

Analyses vere made for total heavy metal, copper and nickel content

and the results are plotted in ppm.

No true anomalies of major significance are indicated and apart from

the C Zone, there appears to be little correlation between the anomalies as

outlined and the known sulphide zones. The large number of boulders mixed in

the overburden, some of which are mineralized, may have contributed to the

confused geochemical picture but in any event the results as plotted are oot

indicative of sulphide bodies other than those already known.

Soil samples were taken with a 3-foot auger and after drying and sieving

vere analyzed b,y hot nitric acid extraction and colorimetric determinations employ

ing variations of the Bloom procedure.

Sgd. "Bruce M. Arnott", P.Bag.

With revisions by:

January 8,

Heaven Lake Area (M-2908)89?45

49 0 I5

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89 045'

Shelby Lake Area - M.2898

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492893

52HC4NE0C27 63.1711 LAC DES ILES 200

AREA OF

LAC DES ILES

DISTRICT OF THUNDER BAY

THUNDER BAY MINING DIVISION

SCALE: 1 INCH 1=40 CHAINS

LEGEND

PATENTED LAND

CROWN LAND SALE

LEASES

LOCATED LAND

LICENSE OF OCCUPATIONMINING RIGHTS ONLY

SURFACE RIGHTS ONLYROADSIMPROVED ROADS

KING'S HIGHWAYSRAILWAYSPOWER LINES

MARSH OR MUSKEG

C.&

©LocU).

M.RK) S.RO.

, r*T^-—'"^sg y i. mi i ss

CANCELLED c.

NOTES

4OO Surface Rights Reservation orotund ail lakes and rivers

NATIONAL TOPOGRAPHIC SERIES 52 H4

PLAN NO. M.I788

ONTARIODEPARTMENT OF MINES

AND NORTHERN AFFAIRS

"f

LAC DES ILES

LEGEND:

Gabbro C omplex

Sulphides

108721 ' 108722 t

l- * (0789? l 107863

i f 107684 l 107880

108169 l 108165

(\SLAND LAKf

GUNNEX LIMITED07864 i /I07866 i 107868

LAC DES ILES CLAIM GROUPA K T H

rO l M G P i V.

SCALE: i INCH * 1320 FEET

52H04NE8C27 53.171 l L AC DES ILES210

Lac des lies Area

ACID INTRUSIVES

BASIC ROCK COMPLEX

NoriU

Gabbro

Uralitizad Gabbro ( coortt grained

Uratitizid Mvlogobbro

Magnttitt Gabbro

ULTRABASIC ROCK COMPLEX

Clinop*ridotif* ( Wetirtita )

Ur ali t i ltd Clmop*rido!iti

Clinopyroxtniti

Diamond Drill Hal*

Fault

Foliation

Sulphidt Zon*

ANACONDA AMERICAN BRASS LIMITEDEASTERN EXPLORATION DIVISION

GENERAL GEOLOGY

To Aeccmw*y fl*po*t S invrnx-Foll ' ftf C ,H. B rlaUy , A .C. Po*rn*i March (987

Y

. \.ov - f*-.w* . J. a fcw~^

N

LEGEND

9 l NIPIGON DIABASE• -x?- 1

ACID INTRUSIVE

6 BASIC ROCK COMPLEX

'l6mb Anorthositt Gabbro

Urolftiztd Gabbro

Uralitiztd Gabbro lcoarst graifitd

UraMtned M e! a gabbro

Magncfitt Gabbro

GEOLOGICAL BOUNDARIES

—— Observed

__ Approximate

__ G P Inferred

Outcrop

— Fault

Sulphide Zone

Foliation

Pit o r Trench

*" Diamond Drill Hole

ASSAYS: Length (Q oCopper - {X) Nictiel - OT Platinum Group

Cilunirv

oes

ANACONDA AMERICAN BRASS LIMITEDEASTERN E XPLORATION DIVISION

PROJECT P-6

GEOLOGICAL PLAN

Zones B, C, E, P SB

PL 40N - 68N

Lac d es I les Area

DATE,

March 1467

SCALEi

t' s 200'

DRAWN BY;

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