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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  03-Apr-1991 by Dorthe E. Jakobsen (DEJ)

Summary Help Help

NMI
Name BEAR (L.14714), BEAR 1, HALL CREEK Mining Division Nelson
BCGS Map 082F034
Status Past Producer NTS Map 082F06W
Latitude 049º 22' 42'' UTM 11 (NAD 83)
Longitude 117º 17' 32'' Northing 5469556
Easting 478788
Commodities Gold, Silver, Copper Deposit Types L01 : Subvolcanic Cu-Ag-Au (As-Sb)
Tectonic Belt Omineca Terrane Quesnel, Plutonic Rocks
Capsule Geology

The Bear occurrence is located on the south side of Hall Creek, 12 kilometres due south of Nelson. The deposit was worked from 1937 to 1942. The Fern mine (082FSW183) adjoins the claims to the east.

The area is underlain by augite basalt flows and flow breccias of the Lower Jurassic Elise Formation (Unit Je1, Open File 1989-11)), Rossland Group intruded by granodiorite and quartz monzonite of the Middle to Late Jurassic Nelson Intrusions and a dark, fine-grained dyke with light feldspar phenocrysts.

The dyke is host to numerous east trending joints and fractures. Fractures and zones of crushed wallrock are host to quartz with pyrite. Minor malachite and abundant pyrite stringers and blebs occur in quartzose crushed rocks. The wallrock adjacent to quartz stringers is oxidized and argillically altered.

The Bear workings are developed at the contact between augite porphyry and a porphyritic granite dyke (?). The vein in the adit is up to 25 centimetres wide, pinches out to 10 centimetres and contains free gold. At surface the ore is rusty and decomposed but also hosts free gold.

The highest assay from a sampling program in 1987 was from a rusty fracture in an open cut, 10 metres east of the adit entrance. The oxidized, agillically altered and crushed quartzose material assayed 35 grams per tonne gold (Assessment Report 16847).

The deposit produced 114 tonnes of material which yielded 4,167 grams of gold and 1,897 grams of silver.

Bibliography
EMPR AR *1937-A38,E36; 1938-A35; 1939-80; 1940-25,65; 1941-26,64; 1942-27,61
EMPR ASS RPT 12984, 12992, *13534, 14010, 16728, (Pt.5), *16847, 16848
EMPR BC METAL MM00959
EMPR BULL 41; 109
EMPR FIELDWORK 1980, pp. 149-158; 1981, pp. 28-32, pp. 176-186; 1987, pp. 19-30; 1988, pp. 33-43; 1989, pp. 247-249; 1990, pp. 291-300
EMPR MAP 7685G; RGS 1977; 8480G
EMPR OF 1988-1; *1989-11; 1991-16
EMPR PF (In 082FSW183: Myers, W.M., 1935: Report on the Fern Mine)
GSC MAP 1090A
GSC MEM 308, pp. 156,173
GSC OF 1195
Andrew, K.P.E. and Hoy, T. (1990): Structural Models for Precious Metal Deposits in Jurassic Arc Volcanic rocks of the Rossland Group, southeastern B.C.; abstract with program, G.A.C. - M.A.C. Annual Meeting, Vancouver, B.C., p. A3
Hoy, T. and Andrew, K.P.E. (1988): Geology, geochemistry and mineral deposits of the Lower Jurassic Rossland Group, southeastern British Columbia; abstract in Twelfth District 6 Meeting, Canadian Institute of Mining and Metallurgy, Fernie, B.C., pp. 11-12
EMPR PFD 752808

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