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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  20-Apr-1991 by Laura L. Coughlan (LLC)

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Name CITY OF SPOKANE (L.804) Mining Division Trail Creek
BCGS Map 082F001
Status Showing NTS Map 082F04W
Latitude 049º 05' 06'' UTM 11 (NAD 83)
Longitude 117º 48' 08'' Northing 5437215
Easting 441424
Commodities Gold, Copper Deposit Types L01 : Subvolcanic Cu-Ag-Au (As-Sb)
Tectonic Belt Omineca Terrane Quesnel, Plutonic Rocks
Capsule Geology

The City of Spokane vein is part of the "North belt" zone of discontinuous veins of the Rossland mining camp. On a regional scale the veins appear continuous but in detail they are lenticular and offset by northerly trending faults. The Spokane vein strikes east-west and dips 80 degrees north.

The vein is hosted by the Rossland monzonite, an east-trending biotite-hornblende-augite monzonite stock. The intrusive is medium- grained, grey to green in color and hosts magnetite, apatite, some sphene with chlorite, epidote, pyrite and pyrrhotite. The stock intrudes siltstone, volcanics and augite porphyry (Rossland sill) of the Lower Jurassic Elise Formation, Rossland Group. A Tertiary lamprophyre dyke crosscuts the monzonite and appears to control the gold-copper mineralization. In 1983, the dyke was dated at 6.30 plus or minus 0.04 million years using biotite in potassium-argon dating. The dyke contains 20 per cent serpentine.

Mineralization in the City of Spokane vein consists of massive pyrrhotite and pyrite carrying low gold and copper values. The heavy sulphide deposit follows the footwall side of the lamprophyre dyke. Other mineralized veins, such as the Mabel (082FSW129), were exposed in open pits in the monzonite host rock further to the north.

Refer to the Le Roi deposit (082FSW093) for a summary of the Rossland mining camp.

EMPR AR 1896-25,557; 1897-537; 1911-172; 1912-161; 1913-134; 1914-332; 1933-241
EMPR BULL 74; 109
EMPR FIELDWORK 1987, pp. 19-30; 1988, pp. 33-43; 1989, pp. 11-27; 1990, pp. 9-31
EMPR OF 1988-1; 1989-11; 1990-8; 1990-9; 1991-2; 1991-16
GSC MAP 1002; 1004; 1518; 1504A
GSC MEM *77, pp. 96,106
GSC P 79-26
CIM Jubilee Vol., 1948, pp. 189-196
ECON GEOL Vol. 68, 1973, pp. 1337-1340
Hodges, L.K. (editor), (1897): Mining in the Pacific Northwest, page 122
Thorpe, R.I. (1967): Controls of Hypogene Sulphide Zoning, Rossland, British Columbia, Ph.D. Thesis, University of Wisconsin