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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Sil- 10
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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
,,*f
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
2 4. . JT,
. X' "' W
VS., .' :^"V;\
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
36C046 i StC'l- ,**0| '*0 SWI4I 3 60180
ssu j 8 5II siu SSM
36OO90 1 16C09* '
SSM i SSM PSSM1 ' l
36OO9I [ 360095
160142 ' 36014ft
SIM ssy*Li -
e l SSM i ssy
SSM l SStf l SSkl l SSM
l 360092 l
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tiKi6SEaaas ea i SAI GAUDETTE
GAUDETTE TWP AREA
SARCO EXPLORATION COMPANY OF CANADA LTD
230
GARDEN RIVER AREA
XI