The Copper Group Crown-granted claims are located on the northeast side of Treat Creek on the southern slopes of Treasure Mountain. This is on the east side of Jervis Inlet, at Prince of Whales Reach. The deposit is a skarn in a roof pendant of strata trapped within the Cretaceous to Tertiary Coast Plutonic Complex.

Host strata are a series of fine-grained andesitic volcanic tuffs and agglomerates with included layers of argillite, chert, limestone, and basalt flows. The whole package has been extensively altered by a quartz diorite phase of the Coast Plutonic Complex. Skarn mineralization occurs along a parallel series of east-west trending structures. Garnet and epidote are the major skarn miner- als. Contained within the skarn are lenticular, massive bodies of magnetite and pyrrhotite with minor chalcopyrite, pyrite and sphaler- ite. Pyrite, magnetite, pyrrhotite, chalcopyrite, sphalerite and galena are also sporadically disseminated in the skarn zones and silicified volcanics. Disseminations of chalocpyrite and molybdenite occur in quartz veins and stockworks in the vicinity of the skarn zones.

A series of five adits over a vertical elevation of 64 metres have been driven to explore the mineralization. A sample taken across 1.2 metres, from the face of an adit, assayed trace gold, 27.43 grams per tonne silver, 1.0 per cent copper and 19.3 per cent iron (Minister of Mines Annual Report 1917, page 283).

The Copper Group of claims were staked in the late 1890's. During the period of 1917 to 1922, a large amount of work was done to develop the showings. The property then remained idle until 1972 and 1973 when some surface mapping and diamond drilling was done. The results of that work are not published and there are no further reports of activity on the claims.