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File Created: 22-Apr-2008 by Garry J. Payie (GJP)
Last Edit:  04-Apr-2022 by Karl A. Flower (KAF)

Summary Help Help

Name OKSARAH Mining Division Atlin
BCGS Map 104K055
Status Showing NTS Map 104K11E
Latitude 058º 33' 28'' UTM 08 (NAD 83)
Longitude 133º 01' 03'' Northing 6492500
Easting 615350
Commodities Copper, Silver Deposit Types * : Unknown
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Oksarah occurrence is located approximately 17.8 kilometres south-southwest from the King Salmon Lake.

A set of subparallel veins are foliated to varying degrees within greenstone that displays rare relict pillows. Most continuous of these is a chalcopyrite vein, 15 to 70 centimetres wide, that can be traced for about 75 metres. A set of magnetite-chalcopyrite veins up to 20 centimetres wide is oriented roughly orthogonal to the main chalcopyrite vein set. Assays from the widest veins of these two sets are, respectively: 6.4 and 0.6 per cent copper, 279 and 10 grams per tonne silver (Fieldwork 1994, Table 3, samples MM1 94-23.021 and 022). Vuggy, quartz-flooded breccia zones up to 10 metres wide and traceable for several hundreds of metres are spatially associated with the copper-silver mineralization, but do not have elevated metal contents.

Widespread deformation and metamorphism have obscured primary textures, and the source of mineralization is uncertain. A hydrothermal origin is possible, but quartz carbonate or other gangue minerals are scarce. A volcanogenic origin is supported by the submarine setting of the hostrocks (as indicated by relict pillows), but sulphides occur as veins both within and cutting fabrics that are interpreted to be much younger than the hostrocks.

The showing was discovered in 1994 by members of the British Columbia Geological Survey during a regional mapping program.

EMPR FIELDWORK *1994, pp. 321-341
EMPR OF *1995-5
EMPR PFD 842515
GSC MAP 6-1960; 931A; 1262A
GSC MEM 248; 362
GSC P 45-30
Burrell, H., Deiss, A.M. (2021-06-23): Thorn Property NI 43-101 Technical Report Sutlahine River Area, British Columbia, Atlin Mining Division