The Copper Cliff (Copper Cleft) showing is situated on the west slope of Nickel Plate Mountain, near its summit, 2.8 kilometres northeast of Hedley.

This Crown-granted claim is underlain by siltstone and limestone of the Upper Triassic Hedley Formation. These sediments are intruded by hornblende porphyritic diorite dykes of the Early Jurassic Hedley Intrusions.

This showing consists of a large outcrop of pyrrhotite and copper sulphides ("copper pyrites"), occurring at the base of a 60 metre bluff. Mineralization is bedded, occurring in layers up to 8 centimetres thick that strike northeast and dip 45 degrees west, parallel to the slope. Sulphide layers vary in composition, with those in the upper part of the showing tending to be richer in copper sulphide and those in the lower part being richer in pyrrhotite. A representative sample assayed 4.11 grams per tonne gold, 96 grams per tonne silver and 1.6 per cent copper (Minister of Mines Annual Report 1901, page 1164).