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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  17-Apr-1991 by Garry J. Payie (GJP)

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Name CROWN POINT (L.981), HIDDEN TREASURE (L.930), SDR Mining Division Trail Creek
BCGS Map 082F002
Status Past Producer NTS Map 082F04W
Latitude 049º 03' 53'' UTM 11 (NAD 83)
Longitude 117º 45' 39'' Northing 5434929
Easting 444423
Commodities Gold, Copper, Silver Deposit Types L01 : Subvolcanic Cu-Ag-Au (As-Sb)
Tectonic Belt Omineca Terrane Quesnel, Plutonic Rocks
Capsule Geology

The old workings on the Crown Point and Hidden Treasure claims are located in an area recently mapped as basaltic tuffs of the Rossland Group, Elise Formation (Open File 1991-2). The Lower Jurassic Rossland Group rocks are intruded by the Early Jurassic Rossland monzonite comprised of a biotite-hornblende-augite monzonite stock. The old workings lie within the zone of thermal metamorphism associated with the monzonite intrusion.

The Crown Point ore shoot is reported to occur along the border of a "diorite porphyrite" tongue intrusive into "augite porphyrite" (Geological Survey of Canada Memoir 77, page 163). The diorite porphyrite, later called diorite porphyry, is considered to be an early dyke facies of the Rossland monzonite. The augite porphyrite is probably an augite phyric phase of the basaltic tuffs recently mapped in the area. The ore deposit was later crosscut by a north-trending Tertiary pulaskite (syenite) dyke which ranges from 9 to 12 metres in width and hosts disseminated pyrite.

Mineralization consists of massive pyrrhotite and chalcopyrite with pyrite which replaces altered wallrock along a well-defined fracture or fault system. The sulphides occur in a gangue of altered rock with quartz and calcite lenses. The deposit strikes 030 degrees and dips to the north. Mineralization is classed as Rossland-type which is heavy sulphide ore, predominantly pyrite and pyrrhotite with minor chalcopyrite and yields gold and copper.

Between 1905 to 1906, 714 tonnes of ore were mined from which were recovered 9456 grams gold, 6065 grams silver and 3600 kilograms copper.

EMPR AR 1896-29,557; 1897-537,543; 1905-172; 1906-153,249; 1949-158
EMPR ASS RPT 24, 9827, 10784
EMPR BULL 74; 109
EMPR EXPL 1981-129; 1982-51
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
EMPR PF (Sulphidic Zoned Gold Skarn Mineralization at Rossland, B.C., Sept. 1989)
GSC MEM *77, pp. 161-163
GSC OF 1195
GSC P 79-26
ECON GEOL Vol.68, 1973, pp. 1337-1346
GCNL #118,#156, 1988
Thorpe, R.I. (1967): Controls of Hypogene Sulphide Zoning, Rossland, British Columbia, Ph.D. Thesis, University of Wisconsin