The Jupiter occurrence is located near the mouth of Berry Creek, on the north side of Lay Creek, 4 kilometres north of the west end of Aiken Lake and approximately 105 kilometres northwest of the community of Germansen Landing.

The Jupiter showings are hosted by altered mafic volcanic rocks of the Upper Triassic Takla Group (Plughat Mountain Formation) which overlie a 1 kilometre section of black pyritic argillite. The andesitic hostrocks have been altered to chlorite and serpentine, and the argillite to soft, brecciated, graphitic material. A body of altered diorite porphyry is located near the entrance to the main adit.

Two distinctive types of mineralization are present. The main structure (the No. 2 zone) is a north striking, steeply west dipping brecciated fault zone cemented by white quartz and cream-coloured calcite containing considerable amounts of graphite and sparingly mineralized with pyrite. The best mineralized section is 30 metres long and a maximum of 60 centimetres in width. In 1954, a grab sample assayed 4.6 grams per tonne gold, 163 grams per tonne silver, 0.08 per cent copper, and 0.8 per cent zinc (Geological Survey of Canada Memoir 274). The second type of mineralization consists of well defined fissure veins which strike northeast and northwest, containing quartz and calcite and heavily mineralized with sphalerite, tetrahedrite, galena and minor chalcopyrite, covellite and pyrrhotite. The two largest of the fissure veins, called the No. 1 and No. 3 veins, range up to 30 centimetres in width. The No. 1 vein has been traced for a length of 32 metres.

The main showings on the west side of Berry Creek have been explored by a 242-metre long adit with several crosscuts. On the east side of Berry Creek, a 49-metre adit has explored a quartz-calcite vein weakly mineralized with sphalerite, pyrite, galena and tetrahedrite. The vein is lenticular and discontinuous and reaches a maximum width of 60 centimetres.