CEOSERRCH CORSU1TRRTS limiTED

43AieNWe79S 2 .774 DUNDONALD 010

.17'

RECEIVED

FE6281972PROJECTS SECTION

TURAM ELECTROMAGNETIC AND

MAGNETOMETER SURVEYS

for

DOME EXPLORATION (CANADA) LIMITED

PROJECT No. 37

DUNDONALD TOWNSHIP, ONTARIO.

(To Accompany Maps 71-5^0 to

February 3, 1972,

INTRODUCTION

A Turain electromagnetic and magnetometer

survey was carried out for Dome Exploration (Canada)

Limited on Project 371 in November and December^ 1971*

The property is located in Dundonald Town

ship, Ontario, 24 miles northeast of Tinunins from where

it is accessible by road. Two grids were covered by

this survey. The east grid consists of portions of

Lots 1 to 3 in Con. III. The west grid consists of

portions of Lots 5 and 6 in Con. Ill and IV.

The purpose of this survey was to locate and

evaluate sub-surface geo-clectrical conductors which

might prove to be sulphide orebodies. No conductors

were located. The accompanying maps show the areas

surveyed ant] the results obtained.

- 2 ~

Magnetometer Survey

Method

The magnetometer survey was carried out with a

Scintrex model MF-2 fluxgate magnetometer which has a con

stant of 20 gammas per scale division on the most sensitive

range. The readings are a measure of the vertical component

of the earth's magnetic field, expressed in gammas.

Readings were t aken along lines ^00 feet apart

at 100 foot Intervals* A few readings were also taken at

50 foot intervti.ls in areas of high magnetic relief. Diurnal

and instrument-drif t^cprrjec tions were made by re-reading

previously established base stations at time intervals not

exceeding 60 minutes. The maximum correction was 1/2 a

gamma per minute.

The readings on the maps are expressed as being

above or below an arbitrarily selected base.

METHOD AND INTERPRETATION OF RESULTS

Turam Electromagnetic Survey

The model 2S Turam equipment was used for this survey. It

was manufactured and developed in Sweden by the ABEM Instrument

Group of the Craelius Company.

In common with other electromagnetic inductive systems the

Turam method is based on the fact that a secondary current is in

duced in an electrical conductor when the conductor is subjected

to an electromagnetic field. This secondary current creates its

own electromagnetic field which, together with the primary applied

field, produces a resultant electromagnetic field. This resultant

field, which can be detected and measured, differs both in phase

and amplitude from the calculated primary field; these differences

may indicate the presence of a conductor.

The primary alternating field is created by the use of a

large horizontal rectangular loop, energized by a current at 660

Hz or 220 Hz. The receiving system consists of two coils 100 feet

apart, connected to a compensator-amplifier which measures the

complex field-strength ratios and phase-differences between suc

cessive points on traverses outside and perpendicular to a long

side of the primary loop. Both the phase-difference readings and

the reduced field-strength ratios are plotted as curves at points

mid-way between the coil positions. The reduced ratios are the

measured ratios divided by the normal ratios. The normal ratios

may be calculated from the geometry of the primary loop and from

the location of the points at which the readings were taken in

relationship to the loop.

The conductivity c

mated from the followir

Ratio Anomaly > 1.00

Very small or nilSmallLargeLarge

)f steeply dipping conductor

lg chart i

Negative Phase-difference

Small to mediumMedium to largeMediumSmall

s may be esti-

Conduc t ivi ty

Very poorPoorGoodVery good

In areas of conductive overburden, the amplitudes of

anomalous readings, both the phase and the ratio, increase as

their distance from the primary loop increases.

- k .

Twelve primary loops wore employed, positioned to the north of tho areas surveyed, A frequency of 660 HZ was used exclusive]y along with a coil interval of 100 feet*

RESULTS

No conductors were located. A considerable portion of the east grjd was not adequately covered because of elect rical interference from the power line and telegraph line* These featxires caused anomalies w d th large amplitudes. Any bedrock conductor in these areas would not be identifiable*

The magnetometer survey over the west grid indicates a rather flat magnetic response with a gradual increase in mag netic intensity from the northeast corner to the southwest corner of the grid. A thickening of the overburden to the northeast could cause this effect.

The east grid j s dominated by two major magnetic anomalies which probably reflect basic iritrusives.

RECOjftlENDATIpNS

No further work on the two grids can be recommended from the results of this survey.

Respectfully submitted,

GEOSEARCH CONSULTANTS LTD.

J. A. Voodard, P. Eng., Consulting Geophysicist.

Project 37 - Turam b Mag.

42A1BNWe795 2 .774 DUNDONALD 900FACTS SHOWN HERE NEED NOT BE REPEATED IN REPORT

TECHNICAL REPORT MUST CONTAIN INTERPRETATION, CONCLUSIONS ETC.

Typp nf Siirvpy., , , E!

Township ^^dcccas ^Xi

Claim holders)-, .-

Auth - "f Report, J tAHHrPSe Suite 111& -

Covering Pates of Survey.

Total Miles of Line cut .

SPECIAL PROVISIONS CREDITS REQUESTED

ENTER 40 days (includes line cutting) for first survey.

ENTER 20 days for each additional survey using same grid.

fir, tTomagrve tic f Maanetip

n^ona 1 d

A* Woodftpd100 University Ave., Torontt

Nnve. 1Q71 - Feb. T. 1972.(linecutting to office)

22.

1

DAYS Geophysical per^iena .

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AIRBORNE CREDITS tSpecial provision credits do not apply to airborne gurvey*)

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

PAT*. Feb. 17/7? sir.NATiTPR. Vs rf r^zZ**^-

PROJECTS SECTION

Res Genl. n r.

1 MPrevious Surveys fa 'Ju ,

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0 . wS GEOLOGICAL BRANCH

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GEOLOGICAL BRANCH

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Onalifiratinns fo&ill^"

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MINING CLAIMS TRAVERSED List numerically

-

(prefix) i (number)P 25571S

255720

2929^9

293649

.,,.......,:........m......,.....,....^.93^5.Q........

3134^5'326fcsb' ;

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TOTAL CLAIMS ... -gg

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GEOPHYSICAL TECHNICAL DATA

GROUND SURVEYS Number of Stations—. Station interval——— Line spacing—————

Wag,1122 Number of

100 feet

400 feet.

Profile scale or Contour intervals Magi 50 gammas A 100 gammas

MAGNETIC InstrumentAccuracy - Scale Diurnal correction Base station location

(specify for each type of lurvey)E. M. Field Strength Ratio - 1 inc. to 20

Phase difference - 1,in? to 10rit e PI 1 1 -fr g

20 gainmas/div. on, most sensitive. range ______ . ____ Repeated base stations 60'ialn* or less time intervals along base lines - 400 feet apart*

ELECTROMAGNETIC InstrumentCoil configuration Coil separationArrurary

;Method: Frequency

ABEM Turatn 2SCo*-Planar

100 feet

I tO1 ( Phase l o

Parameters GRAVITY Instrument—— Scale constant.Corrections made.

B Fixed transmitter 660 Hz

D Shoot back D Inline O Parallel line

(specify V.L.F, rtation) .Fiftld Strenth ratio and haa difference

Base station value and location.

Elevation accuracy——^—^————^————. INDUCED POLARIZATION - RESISTIVITYInstrument ^-——^—.^-.———————.^—...

Time domainFrequencyPower

Frequency domain. Range ______ —

Electrode array^^ Electrode spacing. Type of electrode,

.fhx.

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MCCART TWP - M.545

3260(83^.326084;

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279050 I Z79O54

333091 l 353092

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326489 f 326437

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2657 12697- ®

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I0558B . 103591 i 103592 ; 78579 i 79455 l 79432 n—r-L-~ir-f 103542 . 1035* l '03540 ' 103539 ! 101561 ' 101557 71015 7*016

M.H.Q

103551 i 103550 j (03549 I0354B i 101562 101560 101556 ' 101501 '10149(T~k e " "

l 103555 ! 103554 | 103553 l 103557 , 75818 -J -. - .

(D MAX), l -*W80 (C

I03S5B l 103557 ! 103556 ' 758Z3 l 75B22

103563 1103563; i I03S6I l 103560 ' 75S27 t-————--.--

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GERMAN TWP - M.283

THF TOWNSHIP

OF

DUNDONALDDISTRICT OF

COCHRANE

PORCUPINEMINING DIVISION

SCALE: MNCH-40 CHAINS

LEGEND

PATENTED LAND

CROWN L'AND SALf

LEASES

LOCATED LARD

LICENSE O F OCCUPATIONMINING RIGHTS ONir"SUftfACE RIGHTS QNLY

ROADSIMPROVED ROADS

KING'S H IGHWAYS

RAILWAYS

POWER L INES

MARSH O R M USKEG

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CANCELLED

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NOTES

POSTS FOR CLAIMS S T*KEO OWT LAMOS UMPiR WATERS Of FKtOt*tCK **OU9C; LAKt m OUMDOH*-D TWP SHOULD WOT SE ERECTED Oft **LA*TED tN EVCLVN

400' sjrfoc* rights reservation 010119 of all takes and

strores

LO.7128 - Flooding nghts on Frederick House take reserved TO H.Efr'C 10 contour elev. 903'

R(e 64516,11012

Area marked thus l Park Site.

1 SR.O reserved for Files 39684,51994

DATE OF ISSUE

MAR ^11972

ONT. DEPT. Of MINES AND NORTHERN AFFAIRS

ONTARIODEPARTMENT OF MINES

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