MINERAL INVENTORY FILE NO.
845
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PRODUCT
Nickel
NTS AREA
52L6NW
REF.
NI2
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NAME OF PROPERTY
Maskwa West (Maskwa Open Pit)
OWNER OF OPERATOR ADDRESS
1983
Maskwa Nickel Chrome Mines Limited
P.O. Box 40, Commerce Court West
Toronto, Ontario
M5L 1B4
OBJECT LOCATED
Open Pit
MINING DIVISION
Winnipeg
Latitude
50° 27.90'
Longitude
95° 27.35'
Uncertainty (m)
500 m
UTM Zone
_____
Easting
_______
Northing
_______
L.S./Quarter Section
___
Section
27
Township
17
Range
15 EPM
DESCRIPTION OF DEPOSIT
The deposit is situated within the "metaperidotite basal unit of the Bird River sill, a layered ultramafic to gabbroic body intrusive into the volcanic and sedimentary rocks of the Bird River greenstone belt". The belt, comprising Archean supracrustal volcanic and sedimentary rocks of the Rice Lake Group, trends east-west, has a width of 5-10 km and straddles the Bird River for a strike length of 55 km.
The ultramafic unit of the Bird River sill; covered by thick overburden in an area of low swampy ground, is about 160 m thick and dips 60-80°SE.
The low-grade disseminated sulphide zone within the ultramafic unit consists of marcasite-pyrite, violarite, pentlandite, pyrrhotite and chalcopyrite in a matrix of tale, carbonate, chlorite and serpentine minerals (Coats et al, 1979).
ASSOCIATED MINERALS OR PRODUCTS OF VALUE
Copper
HISTORY OF EXPLORATION AND DEVELOPMENT
The deposit is located 5 km west of Bird (Oiseau) Lake, 4 km north of Bernie Lake, and a few hundred metres south of Provincial Road No. 314.
In 1920 Annie (30030) and Elizabeth Fr. (30109) were staked over the west and east portions on the deposit by J.G. Devlin and F. Waters, respectively. The Elizabeth Fr. was assigned to The Devlin Mining and Development Company, Limited in 1921; Great Falls Mining & Smelting Limited in 1935; and Stanmore Mining & Smelting Limited in 1936. Leases Nos. 723 and 255 were issued for 21 years on the Annie and Elizabeth Dr. in 1926 and 1922, respectively.
The central wedged-shaped portion of the deposit was restaked many times:

Year..............Claim Name..................Claim No...............Staker
1936..............Copper Queen 5............W6895..................H.A. Argue
1942..............Queen Fr......................W10585................R.W. Sweezey
1947..............King Fr.........................W15878................R.W. Sweezey
1948..............Prince Fr.......................W16697...............J. Alksne
1950..............Fair 1 Fr........................W18181...............J. Donner

In 1951 all three claims were assigned to Maskwa Nickel Chrome Mines Limited. Lease M3881 was issued for 21 years on Fair 1 Fr. in 1956.
The Maskwa West zone was discovered by diamond drilling in May 1974. Previous work had been centered on the adjacent Dumbarton Mine property (52L/6; NI1) located 1.2 km to the northeast, because of the thick overburden above the deposit (Coats et al, 1979).
A decision was made to develop an open pit on the orebody and Dumbarton Mines Limited, jointly owned by Maskwa Nickel Chrome Mines Limited and Consolidated Canadian Faraday Limited, was the operator. Production Lease No. 3 was issued in 1975, and production began in the summer of the same year. Ore was shipped to the latter's mill at Werner Lake after being crushed at Dumbarton (Northern Miner, 76 05 13). "Open-pit mining of the upper portion of the Maskwa deposit produced 365 730 tonnes with average grade of 1.16% Ni and 0.20% Cu". (Coats et al, 1979). "A further 900,000 tons (816 000 tonnes) indicated by drilling lies under the open pit and grades around 1.34% Ni and 0.23% Cu", but was not considered to be economic (Northern Miner, 76 06 15). In June, 1976 the operations were closed down, and in 1978 Production Lease No. 3 was converted into Explored Area Lease No. 39. A new lease is pending on the property.
HISTORY OF PRODUCTION
N/A
REFERENCES
Cerny, P., Trueman, D.L., Ziehlke, D.V., Goad, B.E. and Paul, B.J.
1981: The Cat Lake-Winnipeg River and the Wekusko Lake Pegmatite Fields, Manitoba; Manitoba Mineral Resources Division, Economic Geology Report ER80-1.
Coats, C.J.A. and Buchan, R.
1979: Petrology of Serpentinized Metamorphic Olivine, Bird River Sill, Manitoba; Canadian Mineralogist, Vol. 17, p. 847-855.
Coats, C.J.A., Stockford, H.R. and Buchan, R.
1979: Geology of the Maskwa West Nickel Deposit, Manitoba; Canadian Mineralogist, Vol. 17, p. 309-318.
Davies, J.F.
1955: Geology and Mineral Deposits of the Bird Lake Area; Manitoba Mines Branch, Publ. 54-1.
Karup-Moller, S. and Brummer, J.J.
1971: Geology and Sulphide Deposits of the Bird River Claim Group, Southeastern Manitoba in Geoscience Studies in Manitoba; G.A.C., Special Paper No. 9, p. 143-154.
Manitoba Mineral Resources Division; Corporation Files: Dumbarton Mines Limited; Maskwa Nickel Chrome Mines Limited.
Trueman, D.L. and Turnock, A.C.
1982: Bird River Greenstone Belt, Southeast Manitoba: Bird River Greenstone Belt, Southeast Manitoba: Geology and Mineral Deposits; GAC-MAC, Field Trip Guidebook, Trip 9.
Wright, J.F.
1926: Geology and Mineral Deposits of Oiseau River Map-Area, Manitoba; Geological Survey of Canada, Summ. Rept for 1924, Pt. B, p. 88-90.
Wright, J.F.
1932: Geology and Mineral Deposits of a Part of Southeastern Manitoba; Geological Survey of Canada, Mem. 169, p. 95-96.
MAP REFERENCES
*Map 52L/6W, Ryerson Lake (Topo.), 1:50 000; Surveys and Mapping Branch, Ottawa.
Map 1194G, Ryerson Lake (Aeromag.), 1:63 360; Manitoba Mines Branch and Geological Survey of Canada.
Map 54-1, Bird Lake Area (Geol.), 1:12 000 - Accomp. Report by Davies (1955).
Map ER80-1-1, Cat Lake-Winnipeg River Pegmatite Field (Geol.), 1:100 000 - Accomp. Rept. by Cerny et al, (1981).
#Fig. 1, Maskwa Portion of Bird River Sill (Geol.), ~ 1:64 000 - Accomp. Publ. by Coats et al, (1979).
Maps NW6, 52L (Claim), 1:31 680 "Circa 1983", Claim Map Series, Mining Recording, Manitoba Mineral Resources Division.
URL
N/A
REMARKS
Exact location of open pit was confirmed with Mining Engineering Section, Mines Branch, Manitoba Department of Energy and Mines.
NOTES
N/A
Compiled/Revised by:
JDB JDB
Date
08-79 09-83