The Jan showing is adjacent to Chuchuwayha Indian Reserve 2, 4 to 4.5 kilometres northwest of Hedley.

This area on the northeast bank of the Similkameen River is underlain by a north-northwest-trending, steeply west-dipping sequence of Upper Triassic volcanics and sediments of the Stemwinder Mountain and Whistle Creek formations (Nicola Group). The two formations are both intruded from the northwest by medium-grained hornblende biotite quartz diorite of the Early Jurassic Bromley batholith. A few conformable to subconformable sills and dykes of porphyritic diorite of the Early Jurassic Hedley Intrusions are present in both formations.

An area of moderate alteration, including silicification, occurs over an east-west distance of 550 metres and a north-south distance of 800 metres, along the west side of the Indian reserve. The alteration occurs in the upper Stemwinder Mountain Formation (interbedded impure limestone and argillite, thin-bedded siliceous tuff and limestone) and the overlying basal Whistle Creek Formation (massive andesite crystal lithic tuff, thin-bedded andesite ash tuff, limestone boulder conglomerate).

Old trenches, shafts and adits in the area of alteration expose numerous quartz veins and breccias variably mineralized with pyrite, galena, sphalerite and chalcopyrite. A sample of quartz with galena, sphalerite and pyrite from a shaft analysed 16.5 grams per tonne silver, 1.0 per cent lead and 3.1 per cent zinc, and a second sample from an adit containing quartz with pyrite, assayed 3.3 grams per tonne silver, 0.23 per cent lead and 1.6 per cent zinc (Assessment Report 15864, Appendix A, samples R83587, R83581).