The Cop occurrence is located near Gold Bottom Creek about 49 kilometres south of the community of Atlin.

The area is underlain by the northeast contact of an upper Mississippian to Permian ultramafic body of the Cache Creek Complex. The Cache Creek Complex is represented by cherts and argillites of the Mississippian to Triassic Kedahda Formation and altered green basalt of the upper Mississippian to Permian Nakina Formation. The ultramafics are spatially related to Nakina Formation rocks and Monger (Geological Survey of Canada Paper 74-47) believes that they may also be genetically related. Small bodies of Lower Tertiary granodiorite and granophyre (Tertiary?) intrude the ultramafics locally.

The best assays reported came from samples of a felsic dike which cut the ultramafics and contains disseminated chalcopyrite and pyrite. One sample yielded 0.721 per cent copper, 0.215 gram per tonne gold, 6.1 grams per tonne silver, 0.0231 per cent lead, and 0.0204 per cent zinc (Assessment Report 14090). Quartz stockwork zones in the ultramafics are associated with bright orange gossan zones. No anomalous values were obtained from samples of these stockworks.

In 1967, O'Keefe Mountain Mines discovered a block of high-grade chalcocite float on the southwest part of Mount O'Keefe near the summit (Assessment Report 1231). Although this mining interest failed to find the source of the chalcocite a previous owner of the property (C.G. McLennan) was reported to have located a vein of massive chalcocite, between 0.4 and 0.6 metre thick, in unspecified hostrock. Small blebs of chalcopyrite were also observed in granodiorite talus near granodiorite outcrop.

Some fibres of chrysotile asbestos were observed in serpentine just north of the Sloko River and southwest of Mount O'Keefe.

In 2007, Saturn Minerals Inc. conducted reconnaissance prospecting and rock sampling (20) on their Sloko property which lies adjacent to the Cop showing area.