Kirkland Lake, August 25th, 1949.

REPORT ON idJi G'aQPHibTCAL AfliJ GiDLOGiCAL 6URVEX OF THE TOBURN GLAIrnS, REX LMS ARE;

ONTARIO

INTRODUCTION TI^N " 010

During March and April, 1949, a magnetometer survey was conducted on that part of the claims staked by To burn Gold Mines, Limited, lying beneath Rex Lake. The work started on March 1st and completed on April 18th.

The purpose of the survey was to locate possible occurrences of sulphide bearing peridotite or hornblendite beneath the lake. Small occurrences of similar material outcropping along the shore of the lake were found to be nickel-bearing, but not in economic quantities.

AREA - CLAIMS

The claims owned by Toburn Gold Mines, Limited consist of two groups totalling 27 claims. The smaller or west group, include six claims numbered KRL 30^72, 74, 75, 76, 77, 76. The easterly group consists of claims KRL 20279 to KRL 30299 inclusive. The .total area of the E7 claims is approximately 1,080 acres.

LOCATION AND ACCESSIBILITY

That part of Rex Lake included in the claim groups is approximately 48 miles northwest of Kenora, Ontario. The area may be reached by charter air service either from Kenora or Red Lake, which lies 65 miles to the north east.

LAMP SUHVSZ

West Group

For the magnetic survey a base line was started at the west boundary of claim KRL 30275 and carried eastwards on a bearing of N 65 0E, to the east boundary of claim KRL 30/378, or across the two southerly claims of the west group. Lines were turned off at 200-foot intervals and run at 90 0 to the base line to the north and south shores of the lake. These linis were chained and picketed at 50-foot intervals.

Similarly, on the east group, a base line was run from the west boundary of the group at a bearing of N 700 E for a distance of 6200 feet. Lines were turned off at 200-foot intervals except for the last 1200 feet where, because of the imminent break-up, they were extended to 400-foot intervals.

Throughout the survey, stations were established at 50-foot spacing. The close interval between lines and between stations was established because the peridotite occurrences seen on the shores were generally limited in extent and it was felt that the closer spacing would increase the possibilities of outlining the smaller aones, if present.

- g -A total of 2011 magnetic observations were talc en on the two

2,~'-mps, made up as follows:

Field Observations Control Observations Check Observations

Base stations, consisting of 3 permanent leg points, were established at 3390 feet east of the west boundary and 1100 feet north of the base line on the west group and similarily on the east group at 4000 feet east of the west boundary and 990 feet north of the base line. The instrument used was an Askania Schmidt- type vertical magnetometer, adjusted to a sensitivity of 26 gamma per scale division.

A total of 14.2 miles of line were chained and picketed, of which 9.5 miles were on the east group and 4.7 miles on the west group.

PERSONNEL

The field work for the magnetic survey was carried out by Mr. W. J. McDonagh and Mr. P. Hamilton. The survey was conducted under the direction of Mr. M. W. Hotchkin and the office work was done by A. B. Ferguson and S. P. Ogryzlo.

LABOUR BBEaKJXU'iW JQR VJiQBK PURPOSES

1. Line Cutting

2. Magnetometer operator and assistant

3. Consultants.el a work

office work

V^v^iiOU-L Od.

(a) f i el(b) offi

Total

- (no time charged as the survey was made on the lake and lines were carried with the survey)

98 days

2 days 11 days

111 days

MAPS

Maps accompanying this report include a map of the corrected magnetic readings for each of the groups as well as a contour map of each group showing the iso-intensity lines and our interpretation of the magnetic readings. All are drawn to a scale of l inch to 200 feet.'

As the survey was conducted during the late winter months, little could be seen of the shoreline geology, but such outcrops as could be observed have been noted and plotted on the maps.

TOPOGRAPHY

Whilo most of the acreage of the two Tobum Groups is underlain by the water of Rex Lake, the topography of the adjacent land areas is rugged. High rocks ridges, running parallel to the strike of the formations, are present alon^ the shore. Along these, outcrops are abundant and overburden is light in most places.

l- S -

70 GRAPHS ( Con t ' d)

It was hoped that the survey lines might be extended over some of the land areas, but as the shoreline of the laie was generally precipitous, it was not feasible under the soft snow and ice conditions prevailing at the time to extend the lines far enough to tie in with previous surveys made of the shore .area.

GEM

A narrow elongated belt of precambrian sedimentary gneisses, less than a mile in width and trending in a general east-west direction, lies along the shores of Rex Lake. Granite occurs in the gneisses as lit-par-lit injections and also as small dikes and bodies cutting the metamorphosed sedimentary formations. Small dikes and stocks of peridotite are also found intruding the gneisses nenr the north boundary of the west group of claims. Extensive areas of granitic intrusives occur to the north -and south of the sedimentary belt.

In general, the rocks observed were quite massive, although some weak shearing was noted along the shores of Rex -^ake on both of the groups. Sulphide mineralization, in small amounts, was noted on the west group near the north boundary, in the biotite gneiss and also along the contact of peridotite and gneiss.

GEOPHYSICAL

West Group

An examination of the maps of this group, showing the interpretation of the magnetic results, indicates that tnere are three small areas of magnetic intensity. Two of these anomalies, one located at 00 E and 600 N and tne other at 2800 E and 550 N, are over rock outcrops and are probably due to small local concentrations of magnetite. The third magnetic anomaly, located under the -vater of the lake at 2800 E and 500 S, may possibly be caused by a small stock of basic rock such as peridotite or by local concentrations of magnetic minerals in the gneiss. As these anomalies are of small extent, no further work on them is recommended.

Jjroup

The maps of this ^roup, with the interpretation of the magnetic results, indicate the presence of a number of small magnetic anomalies.

The largest of these, which extends from 5000 E en d 700 S to 5400 E and 700 S, is probably caused by pyrrhotite taut it is doubtful that the mineralization is heavy. The shape of this anomaly suggests a rather narrow zone, with a rake to the east, ana since the length is not more than 400 feet no further work on this anomaly is vv'arranted.

A second narrow zone of weak pyrrhotite mineralization is suggested by the small anomaly encountered on 3800 E and LOO K. The length of this ZO^.Q p robably does not exceed 250 feet ana no further work on it is recommended.

. 4 .

E-' st. urOUp

Two small anomalies at the south end of lines 1400 E and 200 E are probably caused by small local concentrations of magnetic minerals.

The abnormally low magnetic intensity at the south end of line 200 E may indicate sulphides to the south but a?sin the anomalous area is small an Q the^e is no reason for aiiy further work.

RECOMMENDATIONS .

The interpretation of the magnetic results of tne survey shows the presence of a number of small magnetic anomalies. These anomalies are caused either by small bodies of basic rocks such as peridotite or by small concentrations of magnetite or pyrrhotite. All of the anomalies which may be one to the presence of sulphides are of small extent and no further work on either of the groups is recommended.

' -

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52L07NEDCM4 63.170 REX LAKE

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TOBURN GOLD MINES. LIMITEDKIRKLAND LAKE, O NTARIO

PROPERTY

LOCATION

SUBJECT

— REX LAKE CLAIMS (EAST GROUP)

— KENORA-RED LAKE MINING DIVISION

- MAGNETIC CONTOURS

SCALE — l" : 200' 170 DATE - APRIL 1949

QRANITIZED 6NEISS

l GRANITIZED l

52L07NE0044 S3 170 REX LAKE 220

TOBURN GOLD MINES. LIMITEDKIRKLAND LAKE. ONTARIO

PROPERTY —

LOCATION —

SUBJECT —

REX LAKE CLAIMS

KENORA-RED LAKE MINING DIVISIONMAGNETIC READINGS

SCALE - l" ' 2 00' DATE - APRIL 1949

KRL 30274 KRL 30277

KRL 30275

HORNBLENDITE, PYROXENITE

GRANITE GNEISS WITH HORNBLENDE a BIOTITE GNEISS

GRANITE

BEARING OF BASE LINE — N 6S* E

52L07NEOM4 63.170 RPC LAKE 230

TOBURN GOLD MINES LIMITED

PROPERTY- REX LAKE CLAIMS LOCATION - RED LAKE MINING DIV.SUBJECT - MAGNETOMETER

READINGSSCALE DATE

- l" 200'

— MAR. 16/49

KRL 30277KRL 30274

302715

BEARING N 650 E

KRL 30278

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KENORA 48 M.

KEY MAP

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HORNBLENDITE, PYROXENITE.

GRANITE GNEISS WITH HORNBLENDE B BIOTITE GNEISS

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ISO-DYNAMIC LINES OF VERTICAL MAGNETIC INTENSITY

INTENSITIES ABOVE NORMAL

i INTENSITIES BELOW NORMAL '

NOTE'AVERAGE READING IN MASSIVE GRANITE ZOOO FT. SOUTH OF THIS POINT *2336 GAMMA

52L07NE0044 S3 170 REX LAKE 240

TOBURN GOLD MINES. LIMITEDKIRKLAND LAKE . ONTARIO

PROPERTY

LOCATION

SUBJECT

- REX LAKE CLAIMS (WEST GROUP)

— KENORA-RED LAKE MINING DIVISION- MAGNETIC CONTOURS

SCALE — 200' DATE - APRIL 1 949