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A! 'H 2 O |970 Se · 2017. 1. 17. · 42m07nw8045 2.62 east of washi lake 010 report of the...
Transcript of A! 'H 2 O |970 Se · 2017. 1. 17. · 42m07nw8045 2.62 east of washi lake 010 report of the...
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,
/: PA47441-42, PA47444-45, PA47412, PA47418-20, PA47422, PA47424, PA47368-71, PA47382,
PA46306-07, PA46314-15, PA46325-27, PA46331, PA46289-93, PA46295-96 (Dwg. No. 5-216-1)
The claims are situated on N.T.S. sheets 42M6 and 7, O.D.M. claim map numbers M-3118,
M-3120 and M-2224, they are held by Mr. A. Roberton of 59 Isabella Street, Apt. 308,
Toronto 5, Ontario whose Miner's Licence number is D14651.
Pour grids of lines were cut, chained and picketed having a line separation of
400 feet and station separation of 100 feet. The line miles of grid totalled
16.95 miles and 1170 stations were established. Electromagnetic reconnaissance using the
Barringer Research Limited LEM2 vertical loop dip angle electromagnetic unit was
carried out using the broadside method. A number of conductor indications were
detailed using fixed transmitter set-ups. All stations were read at 100 foot
intervals. Magnetic readings to - 10 gammas were taken using a Barringer Research
Limited GM102A proton precession total field magnetometer. Readings were taken on
a 50 foot station interval with closures to 25 feet over areas of high magnetic
activity. A few lines of gravity were read on one grid using a Scintrex C62
gravity meter. Gravity stations are on an interval of 100 feet. Leveling of
gravity stations was carried out coincident with this survey.
Linecuttina, geophysical surveying and compilation of data was carried out by
Barringer Research Limited.
- l -
GENERAL
The regional geology of the Washi Lake area (G.S.C. Map 6-1962 - Fort Hope) shows
that the Washi Lake claims lie in a series of Archaean gabbro, volcanics and schists
and gneisses. Pyrrhotite, pyrite and arsenopyrite have been noted on the claims
area while chalcopyrite is seen just to the north and west of the claims. Gold has
been noted in a gabbro just to the north of the east end of Washi Lake. The sul
phides have been recorded both in the schists and the volcanic complex.
Regional airborne magnetics on the scale one inch to the mile (N.T.S. sheets 42M/6-
Makokibatan Lake, geophysics paper 983G and 42M/7 - Kagiami Falls, geophysics paper
993G) show a large arcuate formation through Washi Lake identifiable with the
basic to intermediate Volcanics. Gabbro bodies to the north of the lake have
strong magnetic centres. The northwest trending dykes do not apparently intrude
on any of the ground geophysical grids.
Detailed geologic mapping carried out subsequent to the geophysical survey provides
greater definition to the area 'and will be discussed in relation to each grid.
Generally the ground geophysics has identified the airborne source with conduction
often in association with magnetics. Direct correlations of magnetics and conduction
are apparently suggesting pyrrhotite as part of the conductive source. In other
cases conduction is in flanking association suggestive of contact mineralization.
- 2 -
DETAILED DISCUSSION
Grid 21A
Grid 21A lies in volcanics and may mark the contact between andesite to the north
and basic porphyritic lava to the south. The contact with the gneisses is about
a quarter mile south of the 21A grid base line.
Ground follow-up of the single line H.E.M. anomaly 21A revealed conduction striking
in an east - northeast direction. The conductor which has been traced on the ground
for 2800 feet extends weakly both east and west of the grid. The strongest portion
of the conductor is contained in the grid and extends from lines 12E to 4w. A
single band of strongly conductive material is suggested with dips being very nearly
vertical. Widths while indeterminable in the present data are atleast less than
the station interval of 100 feet.
A broad magnetic formation lies through this grid. Two bodies of slightly different
susceptibility lie together along the base line. A 70 dip to the north is implied
with a suggested depth of 100 feet. The conductor axis lies along the contact
between the two bodies. Graphite and/or sulphides in the basic to intermediate
volcanic contact environment are presumed.
This zone would be a prime target for mineralization, however, the graphite identi
fied in a volcanic environment strike west on grid 3 greatly diminishes the pros
pects in this zone.
Grid 3
This grid of lines lies in the narrows in Washi Lake apparently lying across the
basic to intermediate contact suggested on grid 21A. The northwestern extensions
of the lines appareantly cross from andesite into diorite while the western end
of the grid may touch the gneisses south of the basic volcanics.
- 3 -
A series of conductors have been followed for 6400 feet and continue both east and
west of the grid. Three conductive zones of varying strengths are identified
dipping vertically to steeply north. The varying strengths of H.E.M. systems 30A to
35E is reflected in the variable nature of the ground conductors.
To the east a conductive horizon has been identified which is fairly conductive
over its central portion, especially lines O and 4E. This conductor flanks the
south side of a magnetic high reminiscent of the westerly line of grid 21A. A
continuation of the 21A formation into grid 3 is presumed. Although the magnetics
are less uniform. Depths are apparently less at 65 feet, however this determination
is less clear due to the irregularity. Certainly shallowing to the west is evid
ent.
Drilling on line 36W has not necessarily identified the easterly zone as pyritic
graphite as the zone is separate from the one drilled. The magnetic formation on
the east zone shows continuity (although no conduction) to the south of the
conductor axis drilled. The magnetic environment is similar however and a similar
situation might be presumed.
The main conductive zone which flanks the north edge of the narrows shows evidence
of continuing both east and west off the grid. Its strongest portion is seen in
the narrows where a lightweight drill hole has intersected a broad shear zone
containing 14 feet of 25 % pyrite, 20 feet of 5* pyrrhotite and 51 feet of graphitic
material containing up to lO 5^ pyrite and pyrrhotite. The hole dipping at 50 was
stopped in the graphitic shear. It is felt that this combination of minerals well
explains the conductor as well as the high erratic (and therefore shallow) magnetics.
The easterly extension of this anomaly is weak with no particular magnetic associ
ation. Apparently the shear zone with minor pyrite and graphite continues east.
The strong conductor south of the long zone likely represents higher conductivities
in part of the same shear zone. The magnetic response is not relatable to the
- 4 -
conductor so that less pyrrhotite is presumed in a graphitic shear.
Grid 4
While much of grid 4 is under cover,an outcrop of gneissic volcanics on the base
line to the west suggests that all of the grid is in the gneisses.
E.M. work has revealed a number of conductors in a zone trending east-northeast
for over 7200 feet. The strike of the conductors follows the schistosity noted by
the Government mapping. The ground work derives from airborne H.E.M. anomalies 32A
to 39A. Duality of some conductors has been noted in the airborne record. This
has been confirmed in the ground investigation. Mineralization is suggested by
strong conductors along a zone of weaker responses. Magnetics, which are sharp
and erratic, confine themselves to the conductive horizons. Concentrations of
pyrrhotite extending to surface on this horizon would give reasonable explanation
to the conductive response.
To the west a slightly transgressive dykelike feature is seen to trend northeast,
no strong conduction is associated with this feature although very weak conduction
may follow it to the north.
Drill holes on line 20W intersecting the two strong conductors have revealed a
pyrrhotitic garnet gneiss with sufficient pyrrhotite (10*^-203.) to explain both
the high magnetics (to 4,OOQY) and the strong conduction. It is presumed that
the easterly portion of triis zone is of similar nature.
Grid 6
Grid 6 is apparently fully under cover. The assumed contact between the gneisses
and the volcanics to the north lies possibly a quarter mile north of the east end
of the base line, placing all of the grid in the gneisses.
- 5 -
A series of conductors extends across the grid striking northeast with the
gneissosity. Strong fairly shallow conduction has been observed, well identify
ing the strong airborne responses 37A and 39B. The strike of the conductors are
somewhat transgressive to the base line direction. Asymmetries developed in the
readings as a result prevent direct determination of dips. Quite likely the dips
are steep as in other conductive zones in the area. The zone has been traced 3600
feet and shows no signs of diminishing either east or west.
The magnetics show one main zone striking with one line of conductors across the
grid. Peak values near the centre of the zone exceed 4,000 gammas while anomalous
levels are diminished to less than 1,000 gammas to the east and west. To the north
of the main magnetics a smaller magnetic formation is seen peaking to about 500
gammas over much of its length. Strong conduction is associated with this zone in
the east. This zone is apparently interrupted at about line 4W to reappear at 12W
where E.M. conduction is weak but gaining strength westward. A north-south fault
just west of the western claim boundary would explain this termination as well as
a small offset on the main magnetic zone.
Of the few lines of gravity readings taken on this grid, the largest gravity high
in association with a conductor is 0.3 milligals over the shallow conductor on
line 4E. While some excess mass is apparent suggesting the presence of sulphides,
a large massive sulphide body is precluded. Of the readings on line zero which
are at variance with the rest of the readings it is suggested that faulty base
readings have produced incorrect control of the end points of the line. Otherwise
the readings reflect local gravity effects.
Pyrrhotite with pyrite in a shear zone is quite likely the source of the conduction
and the magnetic highs at this site.
- 6 -
CONCLUSIONS AND RECOMMENDATIONS
Of the four airborne systems indentified and detailed in this work, all have found
reasonable explanation in the ground response. Two systems have been drilled to
reveal uneconomic situations. Of the remainder, system 6 is presumably in the
gneisses and is, like system 4 of little present economic interest. System 21A
and the easterly zone of 3 have not really been tested although a similar source
to the westerly zone of grid 3 has been presumed.
No further work on these anomalous systems is recommended for the present.
BARRINGER RESEARCH LIMITED
LR:lh Laurie Reed, P. Eng.
Senior Geophysicist.
- 7 -
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WASHI LAKE AREA, ONTARIO
rJOiNT VENTURE:PRIVATE INFORMATIONFlying, Mosaic,
D i. i iData Compilation 8 Drafting by
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42M07NW8(i45 3.62 EAST OF WASHI LAKE250
undertaken by "BARRINGER RESEARCH LTD, Toronto, Canada.
R. D. R CANADIAN JOINT VENTURE
SYSTEM 6, WASHI LAKE, ONTARIO
TOTAL INTENSITY MAGNETICS
MAR. 1970 Scale l"* 200' DWG. 5-216-7
LEGEND
•PARALLEL PROFILE. SCALE , l'^20 0
- TRANSMITTER LOCATION
Conductor - Definite
Conductor -Indication
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R.D. P. CANADIAN JOINT VENTURE
SYSTEM 6, WASHI LAKE, ONTARIO
VERTICAL LOOP EM SURVEY
MAR. I9?9 Scale l' 1 * 200' DWG. 5-216-6
LEGEND
— Grovitv Profile Scale: 1=1 Milligal. Base Level^ 3 Milligal.
- — Elevation Profile
E.M. Conductor Definite
EM. Conductor Indication
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Work undertaken by 'BARRINGER RESEARCH LTD, Toronto, Canatfo
R.D. R CANADIAN JOINT VENTURE
SYSTEM 6, WASHI LAKE, ONTARIO
GRAVITY AND ELEVATION
SURVEY
MAR. 1970 Scale 1=200' DWG. 5-216-8
2.62 EAST OF WASHI LAKE
280 EG END
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Datum Level 60,600 tt
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A EM Conductor IndicationV li
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R.D,R CANADIAN JOINT VENTURE
SYSTEM 21 A, WASHI LAKE, ONTARIO
TOTAL INTENSITY MAGNETICS
APRIL 1969 Scale l "s 200* DWG. 5-216-10
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LEGEND
-- Profile Scale l"s 20 0
Transmitter location
Conductor - Definite
3 Conductor - Indication
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R. D-R CANADIAN-JOINT VENTURE
VERTICAL LOOP EM SURVEY
APRIL 1969 Scale t": 200' DWG.5-216-9