The Copper Cliff showing lies 0.8 kilometre west of the Kitsault River, 26 kilometres north of the town of Alice Arm. This showing was extensively prospected for copper in the early 1900s.

The area is underlain by a sequence of volcanics and sediments of the Upper Triassic Stuhini Group and the Lower-Upper Jurassic Hazelton Group. The sequence is folded into the doubly plunging, north-northwest trending Kitsault River syncline and has been regionally metamorphosed to greenschist facies.

The Copper Cliff showing is situated in the gossanous feldspar-hornblende porphyritic "Copper Belt" andesite of the Hazelton Group adjacent to the eastern contact with overlying greywackes and argillite.

This showing is comprised of a silicified zone in pyritic andesite displaying quartz lenses and veinlets and disseminations of pyrite with minor chalcopyrite. A 9.1 metre chip sample assayed 0.34 gram per tonne gold, trace silver, 0.03 per cent copper and trace lead (Geology, Exploration and Mining in British Columbia 1970, page 86).

Several opencuts are evident on the south side of Gash Creek. An adit occurs 15 metres vertically below the opencuts. In 1970, Dolly Varden Mines Ltd. completed geological mapping of surface workings and collected 500 soil samples covering 34 claims.

During 2010 through 2019, Dolly Silver Corporation explored the area as apart of the Dolly Varden property. A complete property exploration history can be found at the Dolly Varden (MINFILE 103P 188) occurrence. In 2014, a grab sample of altered vein material from the Gash Creek area is reported to have assayed 1270 grams per tonne silver, 4.3 per cent lead, 5.2 per cent zinc and 0.18 per cent copper (Higgs, A.A. (2015-05-01): Amended 2015 Technical Report for the Dolly Varden Property).