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File Created: 16-Jan-1996 by Gilles J. Arseneau (GJA)
Last Edit:  16-Jan-1996 by Gilles J. Arseneau (GJA)

Summary Help Help

NMI
Name OMEGA (L.618), TEXAS (L.589), TWILIGHT (L.1854) Mining Division Slocan
BCGS Map 082F095
Status Past Producer NTS Map 082F14E
Latitude 049º 59' 20'' UTM 11 (NAD 83)
Longitude 117º 11' 43'' Northing 5537414
Easting 486002
Commodities Silver, Lead, Zinc Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Omineca Terrane Quesnel
Capsule Geology

The Omega occurrence is situated on Crown grant Lot 618 at 1738 metres above sea level, in the Slocan Mining Division. The property is on the north side of Carpenter Creek about 1.5 kilometres north of the community of Cody.

Regionally, the area lies on the western margin of the Kootenay Arc, in allochthonous rocks of the Quesnel Terrane. In the vicinity of the occurrence, the Quesnel Terrane is dominated by the Upper Triassic Slocan Group, a thick sequence of deformed and metamorphosed shale, argillite, siltstone, quartzite and minor limestone. Rocks of the Slocan Group are tightly and disharmonically folded. Early minor folds are tight to isoclinal with moderate east plunging, southeast inclined axial planes and younger folds are open, southwest plunging with subhorizontal axial planes. The sedimentary sequence has been regionally metamorphosed to lower greenschist facies.

South of the occurrence, the Slocan Group has been intruded by the Middle Jurassic Nelson intrusions which comprise at least six texturally and compositionally distinct phases ranging from diorite to lamprophyre. The most dominant phase is a medium to coarse grained potassium feldspar porphyritic granite. Several feldspar porphyritic granodiorite dikes, apparently related to the Nelson intrusions, also cut the sedimentary sequence near the occurrence (Paper 1989-5).

The Crown grant is underlain by argillite of the Slocan Group that are folded in an anticlinal structure. The beds generally strike southeast and dip 45 degrees southeast and southwest.

The occurrence is developed on a vein within a fissure zone that varies from a few centimetres up to one metre in width. The vein is the extension of the vein found on the Slocan Sovereign property (082FNW036) to the southwest and may correlate with the Reco No. 2 vein on the Reco property (082FNW035) to the northeast. The vein has been explored with one adit on the Omega Crown grant and three short adits on the Texas Crown grant (Lot 589). On the Omega property the vein consists of galena, sphalerite and pyrite usually concentrated in narrow bands, less than 10 centimetres wide, along the vein walls. The bands of massive sulphides are separated by crushed wallrock cemented by quartz, siderite and calcite. Crossfractures cutting the vein at high angles seem to have played a role in localizing the ore and a number of post-mineral faults have caused small displacement of the vein.

Production from the Omega property between 1900 and 1983 yielded 246,809 grams of silver, 41,560 kilograms of lead and 14,496 kilograms of zinc from 132 tonnes mined. Production from the Twilight has been attached to this occurrence.

Bibliography
EMPR AR 1893-1057; 1894-740; 1896-58,60,561; 1900-987,988; 1904-191; 1911-285; 1912-322
EMPR BC METAL MM01345; MM01443
EMPR BULL 29
EMPR INDEX 3-208,216
EMPR IR 1984-5, p. 115
EMPR P 1989-5
GSC MAP 273A; 1090A
GSC MEM 173, p. 14; *184, pp. 107,109; 309, p. 129

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