AIRBORNE ELECTROMAGNETIC SURVEY CALMOR-SELCO JOINT … · AIRBORNE ELECTROMAGNETIC SURVEY CALMOR-SELCO JOINT VENTURE POST LAKE AREA, ONTARIO FILE NO: 13006 l l Vi ... * Co-Pilot Bob

52G15SE001S SaGISSEMIS DUNNE LAKE 010

SICSIVED

AUG l 6 1972rr;oji:cT 3SCCTION

l l l l l l l l l l l li

AIRBORNE ELECTROMAGNETIC SURVEY

CALMOR-SELCO JOINT VENTURE

POST LAKE AREA, ONTARIO

FILE NO: 13006

l

l Vi

QuestorSurveysLimited,20CansoRd.,Rexdale,Ontario,Canada.

l l l l l l l l l

l l ll

53GI5SEW15 S3GI5SEW15 DUNNE LAKE

CONTENTS

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . l

MAP COMPILATION . . . . . . . . . . . . . . . . . . . . l

SURVEY PROCEDURE . . . . . . . . . . . . . . . . . . . 2

INTERPRETATIONand RECOMMENDATIONS . . . . . . . . . . . . . . . . 2

APPENDIX

EQUIPMENT. . . . . . . . . . . . . . . . ,,. . . . . . , . (i)

l MARK V INPUT SYSTEM...............(i)

BARRINGER AM- 104 PROTON PRECESSION MAGNETOMETER.

IDATA PRESENTATION. ...............(iv)

l GENERAL INTERPRETATION ...........(iv)

SAMPLE RECORD

l AREA OUTLINE

- l -

l l l l

m W INTRODUCTION

This report contains our interpretation of the results

l of an airborne electromagnetic survey^flown in the Calmor-Selco

Joint Venture, Post Lake Area, Ontario, on May 3, 1971. A

l brief description of the survey procedure together with

M recommendations for ground follow-up is included.

The survey totalled 133.1 line miles and was performed

l by Questor Surveys Limited. The survey aircraft was a Skyvan

CF-QSL and the operating base was Thunder Bay , Ontario.

I~~————— -—————————————————————— ————————

The personnel involved in the survey were as follows:-

M Pilot Bill Anstey

* Co-Pilot Bob Campbell

l Navigator Al Alexander

Operator Murray Desnoyer

l The area outline is shown on a 1:250,000 map at the end

m o f this report. 1'. is is part of the National Topographic Series

number 52G.

™ MAP COMPILATION

B The base,maps are uncontrolled mosaics constructed from

Ontario Department of Lands and Forests l" a 1 320 feet photo-

I graphs. The mosaics were reproduced at a scale of l" * 1 320

feet on stable transparent film from which white prints can

O be made.

Flight path recovery was accomplished by comparison of

the prints of the 35mm film with the mosaic in order to locate

the fiducial points. These, points are approximately one mile

apart.

l l

l l l

SURVEY PROCEDURE

l Terrain clearance was maintained as close to 400 feet as

posnible, with the E.M. Bird ay approximatel l C. O feet aboe the

l

l

E

A normalSj^Mifa^ya— fcli-lht path using approximately

turns was used. The equipment operator logged the flight

details and monitored the instruments.

A line spacing of 1/8 mile was used.

INTERPRETATION AND RECOMMENDATIONS

A number of interesting conductors were located as aB result of the INPUT survey. These conductors, which have been

l assigned a letter, are briefly described below and those which

have been given a High rating are considered top priority targets,

l The latter are those anomalies that are isolated, have a short

m strike length and display good conductivity.

Several sources of conductivity responded to the E.M.

l survey and they are as follows:-

i) bedrock conductors ie. sulphides and/or graphite,

l ii) structural features ie. geological contact, shear

m zones etc.

iii) surface conductors ie. swamps, lake bottom sedi-

fl ments etc.

Those conductors that were not given High priority ratings,

l are still considered to have possible economic potential. However,

in a couple of instances, such as Conductor Svstems A and M, the

ll

likelihood of massive economic sulphides is low because of their

J geological association and strike length. Also, some conductors

are thought to be due to structural effects. Conductor Systems

™ D, E and K could be put into this category.

l

" Questor Surveys Limited

l K. A

l

i i i i i i i

R. de Carle

Geophysicist

i l ConductorSystem

A

B

C

D

E

F

G

H

J

K

MPHMMRMBMMI

Intercepts

MultipleConductors

25M, 26E,27K, 28J.

22J, 23F, 24H, 25L,26F.

15H, 16H,17M.

14H, 15J,16J, 17L.

23G, 24J,25K, 26G,27J, 28Hand 29T.

25J, 26H, 27H,28G,29G, 30D.

27G, 28F,29H.

30C, 31H,32L, 33,7,34E.

40J, 41G.

•IBMMRMHRMBBi

Strike Length

SeveralMiles.

2000'

2500'

1500'

2000'

4000'

3500'

1500'

2500'

750'

HMMRMMpMH^HHMHMIHi

Relative Conductivity

Fa ir to good .

26E has thebest conduct ivity.

23F has the best conduct ivity.

15H has thebest conduct ivity.

Fair,

Fair to Good.

Fair to Good.

Poor.

Fair.

Poor

mammmammxam

Magnetic Association

Middle Conduct or has 1500-2000 y direct.

None

None

None

None

None

None

2500V

None

None

••••••••••i

Geology

GreywackeConglomer ate.

Piilowlava.

Pillow lava.

Unknown .

BasicVolcanics?

MaficVolcanics.

Mafic Volcanics

Peridotite

MaficVolcanics?

Unknown

mHBBBB

Rating and Common ' s .

Low , Iron formation issuspected.

High, A reconnaissancesurvey is warranted.

High , A ground reconnaissance is suggested.

Medium,

Medium, Could correlate ageological contact or ashear zone.

High, 26G has the bestconductivity.

High, Intercept 26H has the best conductivity.

Low,

Medium, A reconnaissancesurvey is suggested.

Low, Could be due to minorsulphides within a geologicalcontact or a shear zone.

MHBBmMMnHBBIBBmHBm

Conductor System Intercepts

L 33F, 341).

M MultipleConductors

N 19J, 20K,21J, 22H,23J, 24K.

P 15K

R IIP, 12F.

:| S 10F.

1ifi^H1 T 24F, 25N.

i1|9 W 26M, 27D

Strike Length

1500'

SeveralMiles

3000'*

Isolated.

500'

—-—-

500'

500'?

Relative Conductivity

Good

Fair to good

Fair to good

Good

Fair

Good

Fair

Good

Magnetic Association

Nono

None

30^ to so ydirect.

20 y direct

None

None

None

None

Geology

Unknown

Sediments

Acidic andbasic Volcan ics.

Acidic andbasic Volcan ics.

MaficVolcanics?

BasicVolcanics!

Could be with in sediments.

Unknown, poss-

Rating and Comments.

High, Could have interesting possibilities.

Low, Could be due to non magnetic sulphides end/or graphite.

High, A top prioritytarget.

High, Should be investi gated.

Medium, A ground reconn aissance survey is sugg ested.

High, Interesting target.

Low, However, should beinvestigated.

Medium, Could be a con-ibly within sediments.

tinuous trend to the south-east.

(i)

APPENDIX

EQUIPMENT

i l l l l l l l l l l l l l l l l

The aircraft are equipped with

E. M. systems and Barringer AM- 104 or AM- 10 1 A, proton pre

cession magnetometers. Radar altimeters are used for vert

ical control. The outputs of these instruments tcêcjier

with fiducial timing marks are recorded by means of galv

anometer type recorders using light sensitive paper.

Thirty-five millimeter continuous strip cameras are used to

record the actual flight path. i*

(I) MARK V INPUT (R) SYSTEM

The Induced Pulse Transient (INPUT) system is

particularly well suited to the problems of overburden

penetration. Currents are induced into the ground by

means of a pulsed primary electromagnetic field which

is generated in a transmitting loop around the aircraft.

By using half sine wave current pulses and a loop of

large area-turns, the high output power needed*'.for deep

penetration is achieved.

The induced current in a conductor produces a

secondary electromagnetic field which is detected and

measured after the termination of each primary pulse.

Detection is accomplished by means of a receiving coil

towed behind the aircraft on four hundred feet of cable,

and the received signal is processed and recorded by

equipment in the aircraft. Since the measurements are

ll in the ̂ jjng^ôja&AILJfe&tilfiJL.than the frequency domain

l common to continuous wave systems, interference effects

of the primary transmitted field are eliminated. The

l secondary field is in the form of a decaying voltage

m transient originating in time at the ?rmination of the

transmitted pulse. The amplitude of the transient is,

l of course, proportional to the amount of current induced!!'

into the conductor and, in turn, this current is propor-

8 tional to the dimensions, the conductivity and the depth

m beneath the aircraft.

The rate of decay of the transient is inversely

B proportional to conductivity. By sampling the decay

curve at six'different time intervals, and recording

B the amplitude of each sample, an estimate of the rela-

•. tive conductivity can be obtained. By this means, it

is possible to discriminate between the effects due to

B conductive near-surface materials such as swamps and

lake bottoms silts, and those due to genuine bedrock

W sources. The transients due to strong conductors such

(l as sulphides exhibit T.ong decay curves and are therefore

commonly recorded on til six channels. Sheet-like sur-

H face materials, on the otl.ar hand, have short decay

m ,. curves and will normally only show a response in the•w^:•* first two or three channels.

l

(iii)

l

ili

l

lli

The samples, or gates, are positioned at 260, 480,

755, 1100, 1575 and 2100 micro-seconds atter the cessation

of the pulse. The widths of the gates are 225, 225, 320,

410, 500, and 540 micro-seconds respectively.

For homogeneous conditions, the transient decay

will be exponential and the time constant of decay is

equal to the time difference at two successive sampling

points divided by the log ratio of the amplitudes at

these points.

(II) B/.RRINGER AM-104 OR AM-101.A PROTON PRECESSION MAGNETOMETER

The magnetometers which measure the total magnetic

field have a sensitivity of 5 gammas and a jrange from

20,000 gammas to 100,000 gammas.

Because of the high intensity field produced by

the INPUT transmitter, the magnetometer results are re

corded on a time-sharing basis. The magnetometer head is

energized while the transmitter is on, but the read-out

is obtained during a short period when the transmitter is

off. Using this technique, the head is energized for 1.15

seconds and then the transmitter is switched off for 0.15

seconds while the precession frequency is being recorded and

converted to gammas. Thus a magnetic reading is taken

every 1.3 seconds.

(iv)

DATA PRESENTATION

The symbols used to designate the anomalies are

shown in the legend on each map sheet/ and the anomalies

on each line are lettered in alphabetical order in the

direction of flight. Their locations are plotted with

B reference to the fiducial numbers on the visicorder re-

I cord.

A sample record is included at the end of the

l report identifying the method used to correct for the

— position of the E.M. "Bird" and identifies the paramet-1m ers on each channel. Occasionally, a question mark may

l be shown alongside the anomaly symbol. This may occur

when the response is very weak and there is some doubt

l as to whether or not it is caused by turbulence of com-

g pensation noi'se caused by large changes in the position of

* the "bird" relative to the aircraft.

B All the anomaly locations, magnetic correlations,

and the amplitudes of channel number J are listed on the———,—-~.—..—— - —data sheets accompanying the final maps,

l GENERAL INTERPRETATION

l The INPUT system will respond to conductive over

burden and near-surface horizontal conducting layers in

l addition to bedrock conductors. Differentiation is based

m on the rate of transient decay/ magnetic correlation and

the anomaly shape together with the conductor pattern and

l topography.

l

(v)

l Power lines sometimes produce spurious anomalies

m but these can be identified by reference to the monitor

channel,

l Railroad and pipeline responses are recognized

by studyir.g the film strips.

l Graphite or carbonaceous material exhibits a

m wide range of conductivity. When long conductors with

out magnetic correlation are located on or parallel to

l known faults or photographic linears, graphite is most

likely the cause.

m Contact zones can often be predicted when anomaly

B trends coincide with the lines of maximum gradient along

ft i lankin? magnetic anomaly. It la unfortunatt that

l graphite can also occur as relatively short conductors

— and produce attractive looV-; ng anomalies. With no other

" information than the airborne results, these must be ex-

fl amined on the ground.

Serpentized peridotites often produce anomalies

l with a character that is fairly easy to recognize. The

. conductivity which 'is probably caused in part by magnetite,Bm is fairly low so that the anomalies often have a fairly

l large response on channel #1; they decay rapidly, and

they have strong magnetic correlation. INPUT E.M. anom-

| alies over massive magnetites show a relationship to the

m total Fe content. Below 25 - 3(^, very little or no re-

sponse at all is obtained, but as the percentage increases

l the anomalies become quite strong with a characteristic

l

l I l

l l I

(vi)

rate of decay which is usually greater than that pro

duced by massive sulphides.

Commercial sulphide ore bodies are rare, and

those that respond to airborne survey methods usually

have medium to high conductivity. Limited lateral di

mensions are to be expected and many have magnetic cor

relation caused by magnetite or pyrrhotite. Provided

that the ore bodies do not occur within formational

-onductive zones as mentioned above, the anomalies

caused by them will usually be recognized on an E.M.

map as priority targets.

l mm Ky&i

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S2G15SEeei5 S3G15SE0ei5 DUNNE LAKE 900Questor Surveys Limited

Area —

File No..

Page No.

Anomaly Number Fiducial

Numberol

Channels

Channel4

Amplitude

DirectMagnetic

Correlation

Flanking Magnetic Peak

Location ValueRemarks

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41 G 33 g

ONTARIO

Room W 1617 Parliament Buildings Toronto, Ontario M7A 1X1

416:965-6918 February 12, 1973

Mr. W. A. Buchan Mining Recorder Court House Sioux Lookout, Ontario

Dear Sir: V-Re: Mining Claims Pa. 227638 et al, Bell and____Shikag) Quest And Sixmile Lakes, File 2.982

The Airborne Geophysical (Electromagnetic) assessment work credits as shown on the attached statement have been approved as of the date above. Please inform the recorded holder and so indicate on your records.

Yours very truly,

OJ/mw

encl.

Fred W, Matthews Supervisor Projects Unit

cc: Alex Mosher

ccj Selco Mining Corp., Attni Mr. J. Grlbben

cc: Resident GeologistKenora, Ontario i—

SECTION MINISTRY OF NATURAL RESOURCES

TECHNICAL ASSESSMENT WORK CREDITS

2.962

Recorder Holder

Township or Area

...Alex.Mosher

. .Bell.i.Shikag, .Quest .and .Sixmile

Type of Survey and number of Assessment Days Credits per claim

GEOPHYSICAL

Electromagnetic ..........?.P..................days

Magnetometer ...............................days

Radiometric ..... . .......................days

Induced Polarization .....................days

GEOCHEMICAL.......

Man days j _ j

Special Provision! _ |

..days

Airborne lx j

Ground] _ j

NOTICE OF INTENT TO BE ISSUED

["""l Credits have been reduced because of partial coverage of claims.

Credits have been reduced because of corrections to work dates and figures ofapplicant.

NO CREDITS have been allower for the following mining claims as they were not sufficiently covered by the survey:

|~]

Pa,

Mining Claims

227638 to 44 inclusive 227670 to 94 " 227953 to 228000 " 243401 to 51 244338 to 4 9 " 244356 to 244400 " 245401 to 45 246763 to 80 247348 to 67

The Mining Recorder miy reduce the tbovt creditt if necetury tn order thit the tottl number of ipprovtd ttteument dtyt recorded on etch clam doet not exceed the minimum tt/owrd ei followt: Ceophytictl - 80. Ceoloficft - 40,- Ceochemicel - 40;

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Legend

6 Channel Anomaly

5 Channel Anomaly

4 Channel Anomaly

3 Channel Anomaly

2 Channel Anomaly

l Channel Anomaly

' 20 Direct Magnetic CorrelationMP50

\ f J G//fSf-06ffi

QUESTOR SURVEYS LIMITEDAirborne Mk V Input Survey

CALMOR-SELCO JOINT VENTURE

l": 1320 feet

Drawn B y

M S

Dates F lown

May 3,1971

Flight Path R ecovery

K K S

Data Reduction

R K.

Completed

Checked

A K.

-ile No.

13006

52G15SE0015 52G155Ea0l5 DUNNE LAKE S00

Documents

AIRBORNE ELECTROMAGNETIC SURVEY CALMOR-SELCO JOINT … · AIRBORNE ELECTROMAGNETIC SURVEY CALMOR-SELCO JOINT VENTURE POST LAKE AREA, ONTARIO FILE NO: 13006 l l Vi ... * Co-Pilot Bob