42M07NW8045 2.62 EAST OF WASHI LAKE 010 REPORT OF THE HELICOPTER E.M. SURVEY ON THE WASHI LAKE AREA, ONTARIO FOR THE R.D.P. CANADIAN JOINT VENTURE PK'OJi-C'iS Sr.CT "lOfJOXTO A! 'H 2 O |970 f. M PM Se BY: BARRINGER RESEARCH LIMITED 304 CARLINGVIEW DRIVE METROPOLITAN TORONTO REXDALE, ONTARIO APRIL 1970 JOINT VENTURE PRIVATE INFORMATION
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A! 'H 2 O |970 Se · 2017. 1. 17. · 42m07nw8045 2.62 east of washi lake 010 report of the helicopter e.m. survey on the washi lake area, ontario for the r.d.p. canadian joint venture
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42M07NW8045 2.62 EAST OF WASHI LAKE 010
REPORT OF THE
HELICOPTER E.M. SURVEY
ON THE
WASHI LAKE AREA, ONTARIO
FOR
THE R.D.P. CANADIAN JOINT VENTURE
PK'OJi-C'iS Sr.CT "lOfJOXTO
A! 'H 2 O |970f. M PM
SeBY:
BARRINGER RESEARCH LIMITED
304 CARLINGVIEW DRIVE
METROPOLITAN TORONTO
REXDALE, ONTARIO
APRIL 1970
JOINT VENTURE PRIVATE INFORMATION
INTRODUCTION
During the period March 9th to 12th, 1969 a programme of helicopter electromagnetic
flying was carried out at Washi Lake in the Patricia Mining Division of north
western Ontario, a distance of 85 air miles north-northwest of Nakina. This
programme was flown to cover the group of claims, the numbers and location of which
are shown on drawing number 5-216-1. Assessment credit is being requested on the .
following-34-claims:- PA 47439, PA 47441-42, PA 47444-45, PA 47412, PA 47418-20*?^ A. in li I.M^ * f ^ l U
PA 47422, PA 47424, PA 47368-71*7 PA 47382, PA 46306-07, PA 46314-15, PA 46325-27V"
PA 46331, PA 46289-93^ PA 46295-96, PA M0Z^"7
The claims are situated on N.T.S. Sheets 42M/6 and 7, and recorded on the Depart
ment of.Mines Map Numbers M-3118, M-2224, and H- 3120.
The flying area contains approximately 150 miles of lines with 31 line miles
covering the claims area. Flight lines are on a north-northwest bearing with a
nominal line spacing of 1,000 ft.
The programme was flown and data compiled by Barringer Research Limited.
- l -
GENERAL REMARKS
The basic instrument used was a Barringer Research Limited maximum coupled, heli
copter-borne E.M. System. The E.M. values recorded are quadrature and in-phase
responses. The transmitter and receiver coils are mounted in a rigid fibreglass
boom with a coil separation of 28 feet. The boom is towed 115 feet below the
helicopter at a nominal height of 135 feet above ground. The Jet Ranger helicopter
used in this survey was flown on line at a velocity of 60 to 80 m.p.h. Frequency
of operation is 900 Hz.
A DeHavilland Mark 7, 35 millimetre frame camera was flown to recover flight
lines. A Bonser radio altimeter recorded terrain clearance. Data was recorded
on a Brush light sensitive galvanometer type, recorder.
On the diagram of the record following this section, may be seen from top to
bottom: fiducial marks, indicating one frame on the film; the quadrature E.M.
response; the in-phase E.M. response and the altimeter record. The scale of the
quadrature and the in-phase response varies somewhat and is indicated by calibration
pulses along the record. These are 100 parts per million (ppm) of the primary
signal and are generally 2h to 3 inches in height. Full scale on the record is
4 inches. The altimeter scale is 100 feet per inch with ground level of O ft. at
the top of the record.
Conductive sources are indicated by correlating responses on the quadrature and
in-phase records. Definite responses are noted as hatched circles on the plotted
flight lines while conductor indications are seen as open circles. In generally
high noise levels, some of the conductor indications may simply be correlating
noise responses not related to bedrock sources.
- 2 -
BARRINGER HELICOPTER E.M. RECORD
Major Fiducial
Indicates one film frame
200' r
250' -
300' -.
^ALTIMETER-
Top of Record
; QUADRATURE
: INPHASEApprox. Scole 100 RPM.
Bottom of Record
Direction of Flight-
DISCUSSION OF RESULTS
a) General
The Washi Lake claims lie across a series of greenstones and schists striking in
an east-northeast direction. Washi Lake locally marks the contact between volcanics
to the north and schists and gneisses to the south. The area may be cross cut by
a northwest trending diabase dyke. Granodiorite and gabbro extend into the north
of the flying but do not encroach on the claims area (G.S.C. Map 6-1962, Fort Hope).
The regional magnetics (G.S.C. Geophysics Paper 7008G, Fort Hope, Sheet 42M) exhibit
a large narrow arcuate formation open to the south locally trending east-northeast
through Washi Lake. This formation correlates to the long narrow belt of volcanics
through the area. North of the formation at Washi Lake local magnetic centres
indicate the gabbro occurance. South of the arcuate feature northeast trending
linear features demonstrate the presence of diabase dykes. This dyke swarm is for
the most part terminated at the volcanics.
On the present airborne survey conductive zones arc restricted to the schists and
gneisses to the southern portion of the flying. The anomalies in Washi Lake may
mark the contact with the volcanics to the north. North of this line only a few
scattered indications are seen. These are possibly due to noise although their
setting gives them particular interest.
b) Detail
Five systems of moderate to strong amplitudes have been detected with several
individual responses'also noted.
The system 3a to 3b (Dwg.No. 6-159-2) may be on or near the volcanic gneiss
contact. This set of anomalies from 30A to 35E lying in Washi Lake exhibits
variations in amplitude and character suggestive of a variable source which at
- 3 -
line 35 shows multiplicity. Some of the variations are due to the differing
quality of the record between the two flights covering this system. Lines 30,
32 and 34 show somewhat greater noise than lines 31, 33 and 35 flown on a differ
ent day. Differences in air turbulence may be the source of the different noise
characteristics.
Anomaly 30A has an in-phase response of 9 ppm in a noise level of 6 ppm while the
quadrature response is 6 ppm in a noise level of 4 ppm. The adjacent anomaly 31A
has good correlation of in-phase and quadrature response with in-phase signal
being 10 ppm in noise of 3 ppm and the quadrature being 6 ppm in noise of less
than 2 ppm. The in-phase response suggests a second small conductor just south
of the main zone.*
The conductor indications on lines 32 and 33 are weaker and near the noise level.
Although 33 shows clear quadrature and in-phase correlation, the in-phase noise at
6 ppm is nearly as large as the response. On a noisy record, a weak response
may exist on line 34 at fiducial 067.0, however this would be noted only as an
association with adjacent conductors. Some discontinuity of the conductor is
expected.
The series of conductors relating to 37E have strong quadrature response with
lower amplitude near noise, in-phase response. This effect apparently has been
simulated by a drop in altitude of the helicopter, across the system, from 250
feet to 170 feet.
System 5, anomalies 37A and 39B shows strong distinct in-phase response at 15 ppm
with weak quadrature indications. This anomaly is suggestably a fairly good con
ductivity, if narrow source. Lack of conductivity through line 38 suggests an
interrupted system.
System 4 from line 30 to line 40 represents the longest continuous zone of con
duction on the flying. This is a series of generally moderate conductors which
- 4 -
are broad, often suggesting multiplicity of conductive beds. Dual sources are
clearly indicated to the west where anomaly 37B shows two peaks in a broad quad
rature high of 6 ppm in noise of about l ppm. The in-phase here is about 12 ppm
in noise of about 6 ppm. This flat topped response correlates well with the
double peaked quadrature.
A conductive horizon of two and a half miles strike length is indicated to lie
in the schists and gneisses.
System 5 is a series of good discrete, if moderate responses. For example the
anomaly indication on lines 33 has a clear quadrature peak of 7 ppm and in-phase
of 12 ppm. While somewhat transgressive to the local strike, this zone is sugg-
estably a narrow conductive feature in the gneisses.
The system 2 from 23B to the indication on line 28 is a strong zone lying in the
local east north east strike the anomaly 24A shows strong quadrature response of
over 20 ppm in noise of 4 ppm. The in-phase response which is reversed on the
record is over 30 ppm in similar low noise. It is thought that this reversal is
due to an instrumental error. A similar strong response with in-pha " reversed
is seen just to the south of the zone. A ground check would confirm the
reality of these responses. If real they have the strongest conductivity para
meters in this flying.
On the line flown after line 24 (line 22) the anomaly 22A has similar appearance
to 24A and B. While not supported by conduction on adjacent lines this response
could be real representing possible sulphides in the gneisses.
The response 21A in Washi Lake compares favourably with anomalous system 3 and
suggestably represents a mineralized zone along the contact with volcanics to the
north.
Several other indications in the noise may or may not be real. Those on line 33
- 5 -
at fiducial 033.3 and on line 43 at fiducial 081.0 may represent extensions
of conduction already noted in the gneisses. The possible conductors on line 41
at fiducials 074.0 and 074.4 may represent westward extension of anomalous system
A number of scattered possibilities are seen toward the central and northern
end of the flying. These apparently lie in the volcanics and might be followed
up on this account however their noisy origin would make them secondary targets.
- 6 -
CONCLUSIONS AND RECOMMENDATIONS
Shortly after the conclusion of the airborne programme four of the airborne
systems were detailed on the ground using ground E.M. and magnetics. These were
21A, 3, 4, and 6. Subsequently two systems 3 and 4 were drilled to reveal pyritic
graphite in a volcanic setting on Grid 3 and pyrrhotite in gneisses on Grid 4.
Ground work on system 4 confirmed the duality of conduction seen from the air.
The apparent association of systems 2 and 5 to system 4 would provide a conclusion
that these airborne systems 2 and 5 find explanation in the results from system 4.
The remainder are isolated responses, and where they may relate to the volcanicsf
are of such dubious nature that they could not command a ground exploration
programme in themselves.
BARRINGER RESEARCH LIMITED
LR:lh Laurie Reed P. Eng.,
Senior Geophysicist.
- 7 -
H.E.M. DISCUSSION LISTING
ANOMALOUS LINESYSTEMS REFERENCE FIDUCIAL
21A 011.65
2 23B 035.75
24A 050.8
25A 040.4
27A 066.0
Indication line 28 027.25
3 a&b 30A 009.4
31A ' 013.6
Indication line 32 083.5
Indication line 33 031.95
35E, and Indications 041.0, 041.2, 041.45
4 Indication line 30 006.65
Indication line 31 010.05
32A 085.5
33A 034.4
34A 064.55
35D 038.6
37B 062.1
38A 042.35
39A 063.9
Indication line 40 041.25
5 Indication line 31 009.55
Indication line 32 085.9
Indication line 33 035.45
35C 038.6
- 8 -
ANOMALOUS LINESYSTEMS REFERENCE , FIDUCIALl l l l HIM l-. ————M J ———J 'II .~-..l-l.. 1. f II l l. * . a————————^- II Mi l l III
6 37A 060.7
39B 065.8
Indication line 20 070.3
22A 055.5
24A 051.5
Indication line 28 024.3
Indication line 31 016.7
Indication line 33 029.9
Indication line 33 033.2
Indication line 39 069.35
Indication line 39 069.95
Indication line 41 074.05
Indication line 41 074.45
Indication line 43 080.95
Indication line 43 081.05
Indication line 43 086.45
- 9 -
42M07NW8045 2.62 EAST OF WASHI LAKE 020
REPORT OF
GROUND GEOPHYSICAL FOLLOW-UP
OF A HELICOPTER EM SURVEY
ON THE
WASHI LAKE AREA, ONTARIO
FOR
THE R.D.P. CANADIAN JOINT VENTURE
I'f.'OJF.CTS pr.CIION"i ,.:.-)\1O
Af'ii 201970
BY:
BARRINGER RESEARCH LIMITED
304 CARLINGVIEW DRIVE
METROPOLITAN TORONTO
REXDALE, ONTARIO
APRIL 1970
INTRODUCTION
During the period March 23rd to April 16th, 1969 a programme of electromagnetic,
magnetic and gravimetric surveying was carried out over a series of helicopter
electromagnetic responses at Washi Lake, Ontario. Washi Lake is on the Albany
River in the Patricia Mining Division of northwestern Ontario a distance of 85 air
miles NNW of Nakina. Ground exploration was carried out over claim numbers PA47439,