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.


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



35E, and Indications 041.0, 041.2, 041.45

4 Indication line 30 006.65


32A 085.5

33A 034.4

34A 064.55

35D 038.6

37B 062.1

38A 042.35

39A 063.9


5 Indication line 31 009.55



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


22A 055.5

24A 051.5












- 9 -

42M07NW8045 2.62 EAST OF WASHI LAKE 020

REPORT OF

GROUND GEOPHYSICAL FOLLOW-UP

OF A HELICOPTER EM SURVEY

ON THE


FOR

THE R.D.P. CANADIAN JOINT VENTURE

I'f.'OJF.CTS pr.CIION"i ,.:.-)\1O

Af'ii 201970

BY:


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.


LR:lh Laurie Reed, P. Eng.

Senior Geophysicist.

- 7 -

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EM. Conductor Definite

E,M, Conductor indication

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

\

by 'BARRINGER RESEARCH LTD, Toronto, Canada.

R.D. P. CANADIAN JOINT VENTURE


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

42M07N'ff8045 2.62 EAST OF WASHI LAKE270

Work undertaken by 'BARRINGER RESEARCH LTD, Toronto, Canatfo

R.D. R CANADIAN JOINT VENTURE


GRAVITY AND ELEVATION

SURVEY

MAR. 1970 Scale 1=200' DWG. 5-216-8

2.62 EAST OF WASHI LAKE

280 EG END

-A- tProfile Scale l =200b

Datum Level 60,600 tt

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A! 'H 2 O |970 Se · 2017. 1. 17. · 42m07nw8045 2.62 east of washi lake 010 report of the...

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