The Copper King showing is 700 metres west of the Similkameen River and 12 kilometres south-southwest of Princeton. The Ingerbelle mine (092HSE004) is located 1.5 kilometres to the south.
The showing is hosted in intrusive rocks of the Early Jurassic Lost Horse Intrusions, which are comprised of microdiorite, micromonzonite and microsyenite.
A zone of disseminated chalcopyrite and bornite trends west- northwest for 340 metres, generally following a zone of faulting of similar trend. The faults themselves are not mineralized. A 9- metre chip sample, taken along a roadcut on the old Hope-Princeton highway, in the centre of the zone, assayed less than 0.2 per cent copper (Assessment Report 941, page 14). Anomalous gold and copper assays are reported from a 4.5-metre deep shaft and one drill hole, completed in the southeastern portion of the zone in 1899 (Minister of Mines Annual Report 1899, page 741).
Magnetite breccia occurs in a circular area 90 metres in diameter, about 300 metres north of the west end of the disseminated sulphide zone. The breccia is healed with seams of coarse magnetite up to 1.3 centimetres wide. The magnetite is accompanied by traces of copper mineralization. Magnetite disseminations and streaks occur in the vicinity of the breccia zone.