4iKi6SEa0a9 ea ISA i GAUDETTE 010

REPORT ON

RECEIVED

OCT251973PROJECTS SECTION

AIRBORNE ELECTROMAGNETIC AND MAGNETOMETER SURVEY

OF GAUDETTE TOWNSHIP AND THE GARDEN RIVER AREA OF ONTARIO

FOR

ASARCO EXPLORATION COMPANY OF CANADA LIMITED

BY

RENTING EARTH SCIENCES LIMITED

PROJECT NO. 73010

OTTAWA, ONTARIO, May 26, 1973.

E.J. Wilson, B.Se., Geophysicist.

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4iKi6SEeee9 ea i SAI GAUDETTE 010C

TABLE OF CONTENTS

I. INTRODUCTION

II. GEOLOGY

III. DISCUSSION OF RESULTS

IV. RECOMMENDATIONS AND CONCLUSIONS

APPENDIX I

APPENDIX II

Page

1

2

4

6

a)

b)

c)

d)

Anomaly List

Equipment

Description of Records

Survey and MapCompilationProcedures

Data Presentation

Accompanying this Report:-

- Two Plan Maps of Scale l" to 2640'.

SSM-1697

REPORT ONAIRBORNE ELECTROMAGNETIC AND MAGNETOMETER SURVEY

OF GAUDETTE TOWNSHIP AND THE GARDEN RIVER AREA OF ONTARIOFOR:

ASARCO EXPLORATION COMPANY OF CANADA LIMITED

I. INTRODUCTION

This report pertains to a combined electromagnetic

and magnetometer survey conducted over an area of approximately

75 square miles in two townships, Gaudette and T.P. 22, R. 10 in

Ontario. The survey was conducted on behalf of Asarco Exploration

Company of Canada Limited by Kenting Earth Sciences Limited of

Ottawa. Surveying was performed by a geophysically equippedJ^anso.

aircraft, registration CF-JJG based at Sault Ste. Marie, Ontario on

the 18th. of May, 1973.

Geophysical data was acquired from a total of 302.6

line miles.of survey in two areas.

Flight lines were spaced k of a mile apart and oriented

north-south in both areas.

Personnel associated with this project were as follows:

Kenting Aviation Limited

P. Korpatt Pilot - Navigator

J. Armstrong Co-Pilot - Navigator

C.M. Guest Aircraft Engineer.

Kenting Earth Sciences Limited

D. Kupkee Electronic Technician

G. Richardson Data Technician

D. Fitzsimmons Chief Draftsman -Chief Data Technician

l i-

. 9 -*. -

K. Hendry Geophysicis-t

f? E. Rockel Geophysicistji

G.A. Curtis Geophysicist

'- E. J. Wilson Geophysicist.

Data from the survey are plotted on two nap sheets

of scale l inch to 2640 feet prepared from an uncontrolled air

photo laydown. This laydown also served as a reference for navi

gation during the flying of the survey.

A description of the instrumentation with relevant

recorder sett. ings and time delays is given in Appendix II to this

report.

II. GEOLOGY

Reference has been made to the following during

preparation of this report:

Ontario Department of Mines - Preliminary Geological

Map No. P. 302, Batchawana Sheet.

Scale: l inch to 2 miles.

Geological Survey of Canada - Aeromagnetic Series -

Map No. 2201G, Searchmont.

Scale: l inch to l mile.

Geological Survey of Canada - Aeromagnetic Series -

Map No. 2214G, Ranger Lake.

Scale: l inch to l mile.

- 3 -

The survey is over two townships mapped chiefly as

Archean granite and granite gneiss. Aeromagnetic mapping at

1000 feet of Gaudette Township shows a strong trend running north

east. The two roost intense anomalies are due to diabase dykes.

The aeromagnetic data obtained on this survey confirms these

features but shows them to be more discontinuous. The westerly

extension of the anomaly in the northeast of the township is from

a separate source, not considered diabase. A number of less

intensive trends are revealed predominantly running east-west.

These may be due either to weakly magnetised volcanics or to gneiss.

Interestingly, there seems to be a correlation between the mineral

showings and the magnetic profiles. The copper-molybdenum and

molybdenum showings in the southern half of the township appear

to correlate with the less active magnetic profiles, perhaps

suggesting a granitic environment. In the northern half copper-

nickel and sulphide showings are present with more active magnetics,

suggesting a volcanic environment.

The area covering most of T.P. 22, R. 10 yielded

magnetic profiles typical of basic volcanics. The northern portion

of the area in R. 11 appears granitic from the magnetic profiles.

- 4 -

0III. DISCUSSION OF RESULTS

J|., The E.M. anomalies detected during this survey are•'i-

|i divisible into tuo groups.,fv .~" (a") Those arising from coil coupling changes, bursts of

i- noise etc. which can be correlated to events affecting the aircraftli-B

such as manoeuvering and turbulence. These are marked on the charts

during interpretation.

(b) E.M. anomalies arising from conductive zones within

bedrock. These anomalies can usually be grouped into systems.

Grouping is based primarily on position, E.M. characteristics and

magnetic associations and trends.

The following discussion is confined to anomalies

comprising the second group.

Gaudette Township Area

Conductor l is comprised of three very weak responses

running parallel to the magnetic trend, immediately south of a

diabase dyke. Conductivities are poor and the conductor is not

considered a very favourable target.

Conductor 2 appears in a similar position to conductor

l, although not quite parallel to the dyke. This suggests the

host is basic volcanics. E.M. responses are weak but definite,

with conductivity ratios about one. It is questionable if anomaly

21A arises from the same body.

- 5 -

Garden River Area

Conductor 3 appears from the magnetic results to lie

just in or north of a contact of basic volcanic with granitic

rocks. This zone is possibly compounded from as many as three

bands in the vicinity of traverse 34. Anomalies 33A and 34A,

and B are strong with conductivity ratios a little greater than

one. Coincident magnetic anomalies occur with 33A and 34B.

Several sulphide showings are shown on geological Map. P.302 in

the area of this conductor so it may be known. It is considered

a good massive sulphide prospect.

Conductor 4 may also be known, responses are fair and

conductivity ratios greater than one.

Anomaly 37A is coincident with a 150 gamma magnetic

anomaly. The eastern end of this conductor is considered a good

massive sulphide target.

Conductor 5 is a little doubtful as the best response,

52A, may be due to turbulence. If 52A does arise from bedrock the

conductivity ratio is good.

Anomaly 37B coincides with a 80 gamma magnetic feature,

it is considered a fair sulphide prospect.

mIV. RECOMMENDATIONS AND CONCLUSIONS

The survey has detected several bedrock conductors.

Rough topography in both areas has compromised the effectiveness

*?l of the coverage.

' Conductive bedrock zones should be secured andi

investigated in the following order:- conductor 3, conductor 4,

conductor 2, anomaly 37B and finally conductor 1.

Respectfully submitted,

OTTAWA, ONTARIO, E. J. Wilson, B. Se., May 28, 1973. Geophysicist.

||il ; 0 PROJECT

BnB^jlH Anomaly Fiducials

jlffe- 5A 0334/6

fi 6A 0759/61

If' .-.-j. ,if-' 7A 1194/6T"'

ISA 3154/6

16A 3620/2

18A 4432/5

^ 19A 3313/6

20A 3728/31

21A 4149/52

NO. 73010 - GAUDETTE TOWNSHIP AREA

In-Phase Quad Altitude Magnetics Rate

10/10 150 S. Flank 600g X

-/10 180 S. Side 420g X

5/10 260 S. Flank 300g X

10/5 280 Direct 20g X

25/5 200 NIL X

10/5 145 S. Side 3450g X

15/10 160 Direct? 120g 3 S. P.

10/10 210 S. Flank lOOg 3

10/15 180 N. Flank 80g 3

Comments

Narrow

Narrow - Possibly noise

Narrow - High alti tude - Possibly noise

Weak

Narrow - Probable noise

Weak

Weak

Weak

Weak - Modified by turbulence

^'W; ". . - . -' i'-- ,\ -

t.' - ff^j . ^^^^, j U ft .

f-i^ft AnomalyIn fcg: ' - 30A

f; 32A

j" 33Ai f - 1 .j

' , 34A, i

B

35A

B

36A

B

37A

B

40A

43A

B

51A

0 52A

PROJECT NO. 73010 - GARDEN RIVER AREA

Fiducial s

4833/6

5669/72

5930/4

5124/8

5120/4

5514/9

5504/6

5886/90

5879/82

6261/4

6252/4

(7235/8)

7130/3

(7238/41)

8718/21

8955/8

In-PhaseQuad

20/10

20/10

80/70

95/70

105/80

30/30

157-

15/25

25/20

40/35

15/10

30/10

20/10

25/20

157-

25/10

Altitude

200

225

200

200

175

180

210

170

175

160

200

210

200

215

280

200

Magnetics Rate

S. Side 750g X

N. Flank 270g X

Direct lOOg 2A

N. Flank 200g 2B

Direct to S. 2A I60g

Assoc. lOOg 3

S. Edge 130g X

Assoc. 20g 3

S. Flank 130g 3

Direct 150g 3

Direct 80g 3 S. P.

S. Side 330g X

N. Flank 30g X S. P.

Direct? 80g X

S. Flank 80g X

N. Side 750g 3

Comments

Possible turbulence

Weak

Mag. side peak

sl

Dual

Double

Possible turbulence i

Double - Part turbulence '

Off area, - Probably turbulence

Poor

Off area - Possibleturbulence

Probable turbulence

Possible turbulence

APPENDIX II

A. EQUIPMENT

The electromagnetic unit and magnetometer are key instruments in the Spartan Aero Limited Canso survey system. The remainder of the equipment consists of a radar altimeter, an accelerometer, a continuous-strip camera, two recorders, a fiducial numbering system and a 60 cycle noise detector.

The EM unit is the Canadian Aero Service LimitedMARK III low frequepcv (390 c.p.s.^ in-phase/out-of-phase systemj The transmitting coil is mounted forward of the nose of the aircraft and the receiving coil is housed inside the distal end of a tail stinger. The coil orientation is vertical coaxial (i.e. both coils have a common horizontal axis).

An electronic null device is adjusted so that in the absence of a conductor within the range of the system no signal is recorded. The anomalous signal is divided into two components, an in-phas^ component having the same phase as the transmitted field, and an out-of-phase or "quadrature" component, which is at right angles to the transmitted field. Because of the time constant used in the electromagnetic unit theJM in-phase and quadrature signals are delayed by about one second. This is taken inco account: when plotting anomaly positions. The two signal components are continu ously recorded on two channels of the six channel rectilinear recorder.

The magnetometer used in the survey x^as the totalintensity MARK III Fluxgate^ saturable core instrument, developed by Gulf Research and Development Company and installed in a fiberglass housing below the tail stinger of the aircraft.

Output of the magnetometer is presented as one channelon the six channel rectilinear recorder to facilitate correlation with EM traces. It is also presented ac a larger scale on a Gulf Research and Development rectilinear recorder with 10 inch chart width.

Five ser.-^-i t-iv-i ry se^tinys are available: 300, 6CQ. 1200.. 2400, and 4800 earrmaa for full 10 inch deflection on the Gulf chare. Corresponding step values are respectively 250, 500, 1000, 2000 and 4000 gammas. The usable short term sensitivity is approximately 5 gammas and the total dyr.anic ranges ara 250,000 gammas for the 4600, 2400, and 1200 ganma settings, 149,800 gammas for the SCO ga~r.a setting and 74,900 gammas on the 300 gamma setting, genera"11 v a sensitivity of 600 or 1200 earmr.as is used for this tvae of survey.

APPENDIX II - cont'd. 2

A Honeywell radar-altimeter provides a continuous terrain clearance profile on the six channel rectilinear recorder.

if- Because EM response decays rapidly with increasing altitude, this ^. terrain clearance information is important in the analysis of the ;r EM data.

A vertical accelerometer mounted in the aircraftprovides a record of the air turbulence and of any drastic manoeuvres of the aircraft. The accelerometer trace, recorded on the six channel rectilinear recorder, is often helpful in recognizing spurious signals on the EM traces caused by air turbulence or drastic manoeuvres.

A vertically mounted Aeropath AS-5 continuous strip 35 mm. camera, using a 14.5 mm. focal length lens, records the entire flight path of the aircraft.

Synchronization of the film strip with the two recorders employed is accomplished by means of an automatic fiducial numbering system, which prints simultaneous time markers on all records at regular time intervals, usually 10 seconds.

^fc A 60 cycle detector indicates the presence of power lines which usually provide spurious anomalies on the EM records.

B. DESCRIPTION OF RECORDS

Rectilinear Magnetic Record

With the chart oriented so that fiducial numbers increase from right to left, upward deflections on the chart indicate increases in the total magnetic field of the earth. On the 1200 scale the smallest division on the chart is approximately equivalent to 10 gammas. When the record "steps" a change of approximately 1000 gammas is indicated.

SSr'-jT.--

?PENDIX II - cont'd. Page 3

Brush Six Channel Record

With the record oriented so that fiducial numbers^ncrease from right to left, thr tracings from bottom to top of the chart are:

Channel 1)

Channel 2)

Channel 3)

Channel 4)

Channel 5)

Channel 6)

Fiducial marks.

Magnetometer, positive upward, on the 1200 gamma setting full scale deflection is 25 minor divisions and one step approximately 1000 gammas.

EH In-phase, positive upward. Two minor divisions represents approximately 25 parts per million referred to the primary field ac the receiving coil. A calibration signal of 550 parts per million is displayed on the trace to provide an accurate measure of the sensitivity.

EM Quadrature, positive upward. Two minor divisions represents approximately 25 parts per million referred to the primary field at the receiving coil. A calibration signal of 550 parts per million is displayed on the trace to provide an accurate measure of the sensitivity.

Padar altimeter, altitude increases upward, 150' centre line and 300" top line of channel.

Vertical accelerometer

60 cycle detector positive upwards, provides a record of power line 60 c.p.s. noise. There is no calibration but the signal is stronger for the larger power lines.

j|fe -''APPENDIX -II - cont'd. W :̂:'-. '- ifee 4

C. SURVEY AND MAP COMPIIATION PROCEDURES———————————————————————————————

Uncontrolled airphoto mosaics usually serve as basemaps for flying the survey and for compilation of geophysical data. The most common scale is 1/4 mile per inch." The flight lines are oriented perpendicular to the assumed longest dimension of massive sulphide occurrences anticipated in the survey area. Occasionally two or more line directions have to be used to accommodate changes of geological strike within the area. Line spacings normally range between 1/8 and 1/4 mile.

The navigator is provided with "flight strips" of the area to be surveyed. These flight strips are a copy of the airphoto mosaics, with intended flight lines inked and numbered. Navigation along the parallel flight lines is accomplished by visual means based on physical detail observed on the photos. The aircraft is flown at a terrain clearance of 150 feet or, in rough terrain, at the lowest safe altitude.

Flight path is recovered in the field by comparisonof the 35 mm. strip film with airphoto mosaics. Identifiable points are marked on the mosaics and designated by numbers determined from the fiducial numbering system on the film. These recovered flight lines provide a positional basis for plotting the geophysical data. The EM anomalies are listed and graded in the field and are often plotted on the field mosaics to permit immediate acquisition of ground.

In our Ottawa office screened positives of the mosaics are prepared,upon which are drafted the recovered fiducial points, the interpolated flight line positions and significant geophysical data. The geophysical data are subjected to a careful analysis by a geophysicist who prepares an interpretation report including recommendations for further work.

LPENDIX II - cont'd. 5

D. DATA PRESENTATION

The data presentation procedure employed for the Canso geophysical system is a combination of an anomaly listing and a plan map plot of graded EM anomalies. The anomaly listing provides the significant details concerning each anomaly and the map gives a "bird 1 s eye view" of the conductors detected.

For purposes of listing and to facilitate reference in the report each EM anomaly is assigned a "name", which is made up of the number of the line upon which the anomaly occurs plus a letter. For example, on line 257 anomalies would be named 257A, 257B, 257C, etc., from south to north or from west to east. The letter which appears beside each EM anomaly on the map is therefore part of its name. These names also appear on the Brush records and in the anomaly list.

The anomaly list contains: fiducial numbers at the edges of the EM anomaly, in-phase and quadrature amplitudes ^.n parts per million, altitude at which the anomaly was detected, positional relationship of the EM anomaly to magnetic anomalies (if any) , (aCratingJ and comments concerning any other pertinent characteristics of the anomaly.

The nomenclature used in the "magnetics" column of the anomaly list requires some explanation. The main terms used are side, flank, edge and direct. These refec to the position of the EM peak relative to the axis of the magnetic feature. "Direct" depicts coincident peaks and similar widths; "edge" is slightly offset; "flank" is somewhere along the flank of the magnetic anomaly; "side" is down near the base. "M Flank SGOg" means that the EM anomaly occurs along the northern flank of a magnetic feature of 800 gammas total amplitude. When one peak of a multiple EM anomaly coincides with a magnetic high the specific peak may be designated. For example, if the southern peak of a double EM anomaly coincided with a 250 gamma magnetic anomaly the nomenclature would be "Dir. S. 250g".

IPf^;' * |-|?4;#tf. -,- - 4iKi6seaee9 ae i SAI GAUDETTE 900

.1. IROWNtOIATlbn MNf-t

ASARCO EXPLORATION COMPANY OF CANADA LIMITEDSUITE 3300

AA K INO ST t tET WEST

TORONTO l, ONTARIO

M5H 1E2

OCT251973PROJ-CTS SECTION

TillJHONI l JI6l-36*-7t*S

October 22, 1973

Mr. Fred W. Matthews Supervisor-Projects Section Room 1617Whitney Block, Queen's Park Toronto, Ontario

Airborne Geophysical Certificate Gaudette and 2.2R10 Townships Ontario

Dear Sir :

We hereby apply for an Airborne Geophysical Certificate for claims staked in the Townships of Gaudette and 22R10 after completion of an airborne survey. We submit duplicate copies of the report and maps covering the airborne F-M a n^ magnpt-ntnpj-pr cm-way-ac; per regu lations.

The location of the claims for which the certificate is required is shown on the maps accompanying the report. However they are further identified as follows:In Gaudette Township

360105 to 111 inclusive 360151 to 156 inclusive

In Township 22R10 S .b \\ .^ to 92 inclusive \ -, \ v 360094 to 101 inclusive 360131 to 134 inclusive 360137 to 144 inclusive 360147 to 15L inclusive

We trust that the information supplied is sufficient for granting the certificate. However should you require any clarification please do not hesitate to call us.

Yours very truly,

E. B. Nicholls

EBN:lp Encl.

l. L. *tOWH

ASARCO EXPLORATION COMPANY OF CANADA LIMITEDSUITE 3300

44 KINO ST*(IT WEST

TORONTO l, ONTARIOM5H lE2

'4141-1*1-7*93

October 26, 1973

Mr. Fred W. Matthews Supervisor - Projects Section Room 1617Whitney Block, Queen's Park Toronto, Ontario

Dear Mr. Matthews:

We would like to airanend our application of October 22, 1973for an Airborne Geophysical rertificate for claims in GaudetteTownship and Township 22. Range 10. "

The new list would cover the following claims: In Gaudette TownshipS 31^. 360103 - 360111 inclusive

360151—- 360156 inclusive

In Township 22, Range 10CM~*~' '-360086 - 360102 inclusive

360131 - 360150 inclusive

The additional clar.ms have been added to the location map, a copy of which is enclosed.

Thank you.

Yours very truly,

Driffield M. Cameron

DMC:Ip Encl.

3ku\0-Z

Twp. 24 Range II M. 1479

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THE TOWNSHIP OF

GAUDETTE

DISTRICT O ALGOMA-

-SAULT STE. MARIE x MINING DIVISION

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SCALE: 1-INCH ~4O CHAINS

LEGEND

O

MTCNTCD LAND CROWN LAND SALE LEASESLOCATED LANDLICENSE OF OCCUPATIONWININO KttHTS ONLYSURMCE RI6HT9 ONLY .ROADSMPROVED ROADSKING^S HIGHWAYS

RAILWAYSPOWER LINESMARSH OR MUSKEG -

MINES

NOTES ' - " v400' Surface Right* reservation around oil LaKes S Rivers

Lots 2 6, 60,66, a* s r own on r 99. plan M I2i

d ^lon M- lil

not open for stoking

l s .-7? o* m RtQ-^

PLAN NO M. l 2 6 l

B015A1 GAUDETTE 200

MINISTRY OF NATURAL RESOURCESHodgins Twp. M. 1275SURVtYS ANt* MA!' : 'ir-*o HRANCH

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MINISTRY OF NATURAL RESOURCESSURVEYS AND MAPPING BkANCH OF

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SAULT S T Z. M/ A//A/C D /V/S/OA/.. MINWOUHOT *

DAT! OF ISSUE

OCT 25 673MINISTRY

Of ffUTUMl RESOURCES

O J S TR/CT OFt 4 O eh ct z n s f o an M.I459T,Vfi 2 2. R. /l.

SSM ) SSM ' SSM I SSM , S SU I SSM l SSM TsSM

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36OO9I [ 360095

160142 ' 36014ft

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tiKi6SEaaas ea i SAI GAUDETTE

GAUDETTE TWP AREA

SARCO EXPLORATION COMPANY OF CANADA LTD

230

GARDEN RIVER AREA

XI