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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  29-Jul-2013 by Nicole Barlow (NB)

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Name GOLD HILL, GOLD HILL 1-4, GEM, MCDONALD Mining Division Nelson
BCGS Map 082F044
Status Past Producer NTS Map 082F06W
Latitude 049º 25' 33'' UTM 11 (NAD 83)
Longitude 117º 22' 04'' Northing 5474860
Easting 473330
Commodities Gold, Silver, Copper Deposit Types L01 : Subvolcanic Cu-Ag-Au (As-Sb)
Tectonic Belt Omineca Terrane Quesnel, Plutonic Rocks
Capsule Geology

The Gold Hill occurrence is located on Fortynine Creek, 16 kilometres southwest of Nelson. The area was initially explored in the 1890's. The old workings were re-opened in 1974.

The area is underlain by andesite, lapilli tuff (Unit Je8l), basalt flows, flow breccias and subvolcanic intrusions (Unit Je1) of the Lower Jurassic Elise Formation, Rossland Group intruded by lamprophyre dykes. The two units are separated by the Red Mountain normal fault. Foliation and shearing follow a general northwest trend. The sheared volcanic rocks are chloritic with lesser biotite and sericite.

Mineralization occurs in shears and quartz zones, associated with the margins of lamprophyre dykes, hosted in massive to schistose dark green augite porphyritic andesite. The veins generally parallel the strike and dip of the foliation in the schists. The three mineralized veins identified are strongly fault/shear controlled and contain erratic quartz-plagioclase pegmatitic lenses which host chalcopyrite, bornite, and arsenopyrite. Oxidized portions of the veins host malachite, azurite, and free gold. Historical sampling and mining activities indicate erratic gold values which are locally up to 65 grams per tonne, but appear to average about 10 grams. The gold is associated with about 60 grams per tonne silver and about 1.35 per cent copper.

The highest assay from exploration in 1984 was 207.4 grams per tonne gold, 168.315 grams per tonne silver and 4.24 per cent copper (Assessment Report 13878). A channel sample from trenching on the mineralized structure in 1988 assayed 25.1 grams per tonne gold (George Cross News Letter No.205, 1988).

In 1990, Formosa Resources Corp. completed an exploration program of reconnaissance geological prospecting, fill-in line cutting and magnetic and EM geophysical surveys.

EMPR AR 1902-157; 1903-144; 1904-139; 1910-105; 1911-158; 1919-158;
1920-133,148; 1921-143; 1922-209; 1923-214; 1924-192; 1925-248,
251; 1927-316; 1932-25,159; 1934-A27
EMPR ASS RPT 11425, *12486, 12649, 12653, *13878, 15353, 21206
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
GSC MAP 52-13A; 62A; 1090A; 1091A
GSC MEM 34; 308, p. 179
GSC OF 1195
GSC P 49-22; 52-13
GCNL #199, 1984; #205, 1988
IPDM May-Jun. 1984
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
Placer Dome File