MINERAL
INVENTORY FILE NO.
572
______________________________________________________________________________________________________
PRODUCT
NICKEL
NTS AREA
63P12NW
REF.
NI 1
______________________________________________________________________________________________________
NAME OF PROPERTY
BIRCHTREE MINE
OWNER OF
OPERATOR ADDRESS
__________________________
OBJECT LOCATED
Shaft
MINING
DIVISION
The Pas
Latitude
55° 42.14'
Longitude
97° 55.49'
Uncertainty
(m)
400 m
UTM Zone
_____
Easting
_______
Northing
_______
L.S./Quarter
Section
___
Section
___
Township
77
Range
3 WPM
DESCRIPTION OF
DEPOSIT
Sulphides occur in massive to stringer form, and as flow breccia, in
Precambrian perioditite and biotite schist. The ore is fine-to coarse-grained
pentlandite, with minor chalcopyrite, nickel arsenides and other nickel-bearing
minerals.
The tabular deposit is 4 800 ft. long, 4 000 ft. wide, and 10 ft.
thick (true dimensions). It strikes north to northeast, dips steeply west, and
plunges north at 80°. It is stratigraphically controlled near the contacts with
metasediments and schists (INCO Exploration Staff, Thompson, Sept. 23,
1975).
ASSOCIATED
MINERALS OR PRODUCTS OF VALUE
Copper, Cobalt, Gold, Silver, Platinum, Palladium
HISTORY OF
EXPLORATION AND DEVELOPMENT
The mine is 4 km east of Birchtree Lake and about 5 km
southwest of the city of Thompson.
Pip 411 was the sight of the original
discovery. The Gay and Ink groups also overlie the deposit. The following
history is that of Pip 301 and Ink 6, the claims on which shafts were
sunk.
Pip 301 (P 27900) was staked by A. Crait on behalf of Canadian Nickel
Company Limited in 1953 and assigned to the company that same year. A
geophysical survey was completed by April, 1954. Results are not known. The
claim was assigned to The International Nickel Company of Canada, Limited
(hereinafter INCO) in 1956 and leased as M-4842 in 1959.
Ink 6 (P 1383A) was
a partial restaking of Jip 144 (P 54963). Jip 144 was staked by O. Perepeluk and
assigned to Quinn-Labine Mines Limited in 1957. A magnetometer survey found a
conductor on the southern part of the claim. Jip 144 was assigned to Conwest
Exploration Company Limited and then to Birchtree Mines Limited in 1958.
It was cancelled one year later. The dimensions of Jip 144 and Pip 301 were
drastically changed when the latter claim was surveyed in 1958.
Ink 6 was
staked in 1962 by J.F. Church on behalf of Canadian Nickel Company Limited and
was immediately assigned to that company. It was transferred to INCO in 1962 and
leased as M-7909 one year later.
The discovery of the Birchtree
deposit was announced by H.S. Wingate, Chairman of the Board of INCO in his
Address to Shareholders in 1964. He stated, "...the grade of the ore is good and
the indicated quantity is sufficient to warrant immediate mining". Apart from
this statement no other grade or tonnage estimates have been released.
The
sinking of the development shaft began on Ink 6 in 1964. This three-compartment
shaft was completed to 1373 ft. one year later. Between 1965 and 1967 the
production shaft on Pip 301 was sunk to 2800 ft., with levels between 300 and
2300 ft. at 200 ft. intervals (INCO Thompson Exploration Staff, July 24, 1975).
The two shafts were to be connected on all levels above 1300 ft. The bottom
production level was 2300 ft. in 1965 (INCO Thompson Exploration Staff, Sept.
23, 1975).
Lateral development took place in the production shaft in 1966.
Production commenced in 1969 at the rate of 4000 short wet tons per day (Company
Report, 1969). MacKenzie (1968, p. 75) reported that the maximum grade was 2.58%
Ni. The development shaft became an intake for fresh air in 1970. Production was
reduced to 2800 tons per day in 1971, "...to counteract weak nickel markets and
avoid inventory build-up", (Northern Miner, Aug. 2, 1973).
Amax Exploration,
Inc. flew an airborne geophysical survey over the area in 1967 under Airborne
Permit 66. A small coincident magnetic and electromagnetic anomaly was found in
this vicinity.
As of December 31, 1969 proven ore reserves of Thompson,
Birchtree and possibly Pipe and Soab were 71 472 000 tons with a nickel
content of 1 336 000 tons and a copper content of 104 000 tons (INCO Prospectus
for 1970).
As of December 31, 1970 proven ore reserves of Thompson,
Birchtree and possibly Soab and Pipe were 71 550 000 tons with a nickel
content of 1 400 000 tons and a copper content of 100 000 tons (INCO Prospectus
for 1971). According to Canavest House Limited (December, 1971) this is
equivalent to 1.95% Ni and 0.14% Cu. The reserves for Thompson (36 million tons)
and Birchtree (14 million tons) were estimated to grade 2.30% Ni and
0.15% Cu.
Production in 1976 from Birchtree comprised 5900 tons per
day operating at two shifts per day, five days a week. Grade was estimated at 2%
Ni. Shaft deepening, another 2000 feet, was underway (Financial Post, June 19,
1976).
Due to market conditions, Birchtree production was suspended in
December, 1977 (INCO Ann. Rept. 1977), but the mine was to be maintained on a
standby basis (Northern Miner, October 27, 1977). Re-opening of Birchtree
was considered in 1981, but was deferred in favour of development of the
Thompson open pit mine (see: 63P/12 NI 2).
HISTORY OF
PRODUCTION
Production rate: 1969 4000 wet short tons per day
1973 2800 wet
short tons per day
Production capacity: 4000 tons per day
Ore trucked
to Thompson Mine for processing.
Total Production from Thompson and
Birchtree
Year Tonnage % NI % CU
1969 3,198,000 2.25
0.15
1970 3,867,000 2.18 0.14
(INCO Prospectus for 1970, 1971)
REFERENCES
Airborne Permit 66, NW 12, 63P; Non-confidential Assessment Files;
Geoscience Data Section, Manitoba Mineral Resources Division.
Bell, C.K.,
1965: Reconnaissance Mapping in Upper Nelson River Area in Report of Activities;
Field, 1964; Geological Survey of Canada Paper 65-1, p. 94.
Bell, C.K., 1971:
Boundary Geology, Upper Nelson River Area, Manitoba and Northwestern Ontario in
Geoscience Studies in Manitoba; Geological Association of Canada, Special Paper
9, p. 11-40.
Brooks, R.H., and Myers, R.E., 1979: Blasthole Stoping at INCO's
Birchtree Mine; C.I.M. Bull., v. 72 no. 806 (June, 1979), p.
68-71.
Coats, C.J.A., Quirke, T.T., Bell, C.K., Cranstone, D.A., and
Campbell, F.H.A., 1972: Geology and Mineral Deposits of the Flin Flon, Lynn Lake
and Thompson Areas, Manitoba, and the Churchill-Superior Front of the Western
Precambrian Shield; International Geological Congress, 24th Session, p.
63-71.
Davies, J.F., 1960: Geology of the Thompson-Moak Lake District,
Manitoba; C.I.M.M. Bull., v. 81, no. 4, p. 101-4.
Dawson, A.S., 1952: Geology
of the Partridge Crop Lake Area; Manitoba Mines Branch, Publication
41-1.
Douglas, R.J.W. (Ed.), 1970: Geology and Economic Minerals of Canada;
Geological Survey of Canada , Economic Report 1, p. 180, 1.
INCO Limited: NW
12, 63P, Corporate File, Manitoba Mineral Resources Division.
INCO Limited:
Corporation File, Mineral Policy Sector, Ottawa.
International Nickel Company
of Canada, Limited, The, 1965: Birchtree Mine in Manitoba; Western Miner,
v. 38, no. 10, Oct., p. 106, 7.
Jip, Moe, Zip, NW 12, 63P; Non-confidential
Assessment File; Geoscience Data Section, Manitoba Mineral Resources
Division.
Kilburn, L.C., Wilson, H.D.B., Graham, A.R., Ogura, Y., Coats,
C.J.A., and Scoates, R.F.J., 1969: Nickel Sulphide Ores Related to Ultrabasic
Intrusions in Canada; Economic Geological Monograph 4, p. 276, 7.
Len, 8, 9,
14-16, NW 12, 63P; Non-confidential Assessment File; Geoscience Data Section,
Manitoba Mineral Resources Division.
MacKenzie, B.W., 1968: Nickel-Canada and
the World; Mineral Resources Division, Ottawa, Mineral Report 16, p. 69,
75.
Patterson, J.M., 1963: Geology of the Thompson-Moak Lake Area; Manitoba
Mines Branch, Publication 60-4.
Paula, May, NW 12, 63P; Non-confidential
Assessment File; Geoscience Data Section, Manitoba Mineral Resources
Division.
Udo 3-11, NW 12, 63P; Non-confidential Assessment File; Geoscience
Data Section, Manitoba Mineral Resources Division.
Wilson, H.D.B., and
Brisbin, W.D., 1961: Regional Structure of the Thompson-Moak Lake Nickel Belt;
C.M. & M. Trans., v. LXIV, 1961, p. XXX and Bull., v. 54, no. 595 (November,
1961), p. 815-23.
MAP REFERENCES
Map 63P/12W, Thompson (Topographic), Scale 1:50 000; Surveys &
Mapping Branch, Ottawa.
Map 2601 G, Thompson (Aeromagnetic), Scale 1:63 360;
Manitoba Mines Branch and Geological Survey of Canada.
Map 41-1, Partridge
Crop Lake Area (Geology), Scale 1:126 720; accompanied Publication by Dawson
(1952); Manitoba Mines Branch.
Map 51-3, Sipiwesk (Geology), Scale 1:253 440;
accompanied Marginal Notes by Harrison (1951), Geological Survey of
Canada.
Map of Moak-Setting Lake Area (Geology), Scale 1:96 000; accompanied
Coats et. al. (1972), International Geological Congress.
Maps, SW 6, 63P
(Claim), Scale 1:31 680; "Circa 1975", Claim Map Series, Mining Recording,
Manitoba Mineral Resources Division.
URL
N/A
REMARKS
Minor pyrrhotite and more rarely, chalcopyrite were found on several
claims in NW 12, 63P:
Claim Name Assessment
U No. File
Mineralization
Jip 129 Jip, Moe, Zip Very minor Pyrrhotite; highest assay
.08% Ni.
(P 52458)
Len 10, Len Len 8, 9, 14- Minor Pyrrhotite,
chalcopyrite; visual estimate 15% pyrrhotite
24. Frac. 16 1%
chalcopyrite.
(P 9328C, 40C)
Paula Paula, May Minor pyrrhotite and
chalcopyrite.
(P 56089)
Udo Udo 3-11 Pyrrhotite.
(P 24044)
NOTES
N/A
Compiled/Revised
by:
SMH JDB
Date
11-65 2-73 11-75 05-82