GEOSERRCH COHSUI42ieiNE0691 2.3981 NEWNHAM BAY

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JUL X 1981

MINING LAN L* SECTION

Electromagnetic and Magnetic Surveyfor

DOME EXPLORATION (CANADA) LIMITEDon

PROJECT 159BLawagamau River, West Group.

Ontario

(To Accompany Maps! 81-12B, 81-13B)

June 12, 1981

- l -

GEOSEHRCH consuimnTS umiTEO

INTRODUCTION

An electromagnetic and magnetic survey was

carried out for Dome Exploration (Canada) Limited on

Project 159B, comprising three grids, in February and

March, 1981.

The grids are located between -J- mile and 1^- milesi

west of the Kattwagami River, 83 miles north-northeast of

Cochrane, Ontario. Access was made by aircraft from

La Sarre, Quebec.

The purpose of this survey was to locate sub-surface

geo-electrical conductors which might prove to be base metal

orebodies. Three conductors were located. The accompanying

maps show the area surveyed and the results obtained.

A technical data sheet is appended to this report.

)D AND INTERPRETATION OF RESULTS - ELECTROMAGNETIC SURVEY

Op era t inff Princ iple i When an electrical conductor is subjected to a

primary alternating field, a secondary current is induced in the

conductor. This current produces a secondary alternating field which together with the primary field produces a resultant field of

different amplitude and phase from the applied primary field. These

differences may indicate the presence of a conductor*

Operation; The battery-powered transmitter sets up a primary field while the in-phase and out-of-phase (quadrature) components of the

complex secondary vertical field are detected by a receiving coil and measured by means of a compensator-amplifier unit located a fixed

distance from the transmitter unit* These parameters are expressed

in percentage of the primary field*

Conductor Recognition; The typical curve over a steeply-dipping conductor

shows a low (negative - greater than 5^) over the centre of the

conductor, flanked by positive readings on both sides of the conductor*

Both the in-phase and the out-of-phase components usually produce

the same general shape of curve. An asymmetrical curve may indicate

one or more of the following conditions; (l) more than one conductor

(2) variable conductive overburden (3) a shallow dipping conductor*

Conduc t ivi ty De termination ; The ratio of the amplitudes of the two

measured components, in-phase to out-of-phase, is directly proportional

to the conductivity of the conductor, in areas of non-conductive

overburden.

Conductor Location; For a single conductor, both component readings are

normally zero when either the transmitting or receiving coil is

directly above the conductor. The location of the conductor is cal culated by adding one-half the distance between the transmitting coil

and the receiving coil (coil interval) to the co-ordinate at which

the readings are zero. A unique solution is generally not possible

in the case of multiple conductors spaced less than one coil interval

apart* This results in the possibility that an apparently wide

conductor may actually consist of two or more narrow conductors*

Depth of Penetration; The maximum depth of penetration for detection of

a steeply-dipping conductor in a geo-electrically neutral background

is about 0.7 times the coil interval* Over horizontal or flatly-

dipping conductors, penetration of up to 1*5 times the coil interval

is possible*

- 3 -

CEDSERRCH COHSUITRHTS UHIITED

INSULTS

Grid B-2 (Maps 81-12B2 East A West, 81-13B2 East A West)

A weak, poorly-defined conductor was located on

Line 16W at 5+30S (Map 81-12B2 West). It does not have any

significant magnetic expression* Its indicated location may

not be accurate as there is interference from the anomalous

readings caused by the conductor to the south at 8+50S.

A conductor was located between Line 20W, 11+25S and

Line 12W, 8+35S. It has the highest conductivity on Line 12W

where it is well-defined. The conductor does not have any

significant magnetic expression.

On Line 24E in the vicinity of UN (Map 81-12B East)

there are some anomalously negative high frequency out-of-phase

readings. As the low frequency readings are not anomalous at

this point, no conductor has been indicated.

The magnetic results on Map 81-13B2 East indicate a

narrow linear dike-like structure striking from Line 4E, 2U+50N

to Line USE, 6S. A similar dike about UOO feet wide intersects

the first one at an angle of 70 on Line 48E at 6S.

Grid B-3 (Maps 81-12B3, 81-13B3)

No conductors were located. Lines UN, 8N and 12N

were re-surveyed with an 800 foot coil interval in the event

that a conductor was beyond the range of a 600 foot coil

CEDSERRCH CORSUITRHTS LI m IT E D

interval survey. The 800 foot coil interval work also failed

to locate a conductor. Three lines perpendicular to the

original lines were also surveyed in case there was a N.W.-S.E.

striking conductor. The results were negative.

The magnetic results show little magnetic relief.

A strike direction roughly parallel with the base line is

indicated.

Grid B-4 (Maps 81-12B4, 81-13B4 East 6 Vest)

One very weak conductor was located on Map 81-12B4

West between Line 60W, ION and Line 52W, 9+35N. There is no

significant magnetic expression associated with this conductor.

The conductor's amplitudes and ratios suggest it may be due to

conductivity in the overburden rather than in the bedrock.

The magnetic results show low magnetic relief except

in the southeast corner of Map 81-13B4 West where there are

readings up to 1200 gammas above background.

RECOMMENDATIONS

A drill hole is recommended to test the conductor

on Grid B-2, Line 12W at 8+UOS* The remaining conductors are

too weak to be attractive drill targets,s

GEOSEARCH CONSULTANTS LTD.

J. A, Woodard, P, Eng.

Geophysicist

Ministry of Natur

GEOPHYSICAL - GEOLOGK TECHNICAL DATA

l-tlc.

39ei NEWNHAM BAY900

TO BE ATTACHED AS AN APPENDIX TO TECHNICAL RKWJKiFACTS SHOWN HERE NEED NOT BE REPEATED IN REPORT

TECHNICAL REPORT MUST CONTAIN INTERPRETATION, CONCLUSIONS ETC.

Type of Survey(s) Electromagnetic and Magnetic

Township or Area Newnham Creek d Newnham Bay Areas

Claim Holder(s) Dome Exploration (Canada) Limited\

Survey Company Geosearcli Consultants .Ltd,—————Author of Report J. Ac Woodard—-——————.---.-—-—-.

Suite 700, 88 University Ave. Address ot Anfhnr --p..,, . r ,^,- fw*-- Mr. T tTf,__________j. vjx uji i/u i uj i i/ e I'iju PTT3

Covering Dates of Survey Feb. 15 to March k, 1981

Total Miles of Line Cut 26

SPECIAL PROVISIONS CREDITS REQUESTED

ENTER 40 days (includes line cutting) for first survey.ENTER 20 days for each additional survey using same grid.

Geophysical-Electromagnetic.—Magnetometer——Radiometric——-Other—————.

DAYS per claim

ko20

Geological.Geochemical.

AIRBORNE CREDITS (Special provision credits do not apply to airborne lurveyi)

Magnetometer. .Electromagnetic ,, . Radiometric(enter days per claim)

June 19/81 SIGNATURE:.Y 'Author of Report or Agent

Res. Geol.. .Qualifications.Previous Surveys

File No. Type Date Claim Holder

MINING CLAIMS TRAVERSED List numerically

P-566009(prefix) (number)

566330 to 566332

566020

566287

566295

566299

566303

566307

566311

to 566025

to 566292

to 566296

to 566300

to 56630^

to 566308

to 566315

TOTAL CLAIMS 22.

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AREA OF

NEWNHAM CREEK

DISTRICT OF COCHRANE

PORCUPINE MINING DIVISION

SCALE: l-INCH r: 4O CHAINS

LEGEND

PATENTED LANDCROWN LAND SALELEASESLOCATED LANDLICENSE OF OCCUPATIONMINING RIGHTS ONLYSURFACE RIGHTS ONLYROADSIMPROVED ROADSKING'S HIGHWAYSRAILWAYSPOWER LINESMARSH OR MUSKEGMINESCANCELLED

C.S.(D Loc.L.O.

M.R.O. S.R.O.

NOTES

400' Surface Rights Reservation around

all lakes and rivers.

DATE OF ISSUE

MAR301982

Ministry of Natural ResourcesTORONTO

NATIONAL TOPOGRAPHIC SERIES 421

PLAN NO. MONTARIO

MINISTRY OF NATURAL RESOURCES

SURVEYS AND MAPPING BRANCH

LOCATION MAP

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TOTAL fj^to MAGsieroMETecby

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PROJECT 159 B-4LAWAGAMAU RIVER AREA, WE.ST

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DOME EXPLORATION (fcANAOA) LIMITED PROJECT159B-3NOTE: M.E.-SiW. UNCS NOT CUT, JUST BlAtED

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GEOS&ARCH CONSULTANTS LTD.for

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