A vein of copper ore is reported to occur near the summit of a bluff on the west side of Henderson Lake, about 800 metres up the lake from the narrows at its mouth. In an adit 6 metres long, copper ore about 60 centimetres wide is exposed, striking 025 degrees and dipping 26 degrees to the southeast. The vein of copper (described as a ledge of ore) can be traced on surface for at least 12 metres. A sample of sorted ore assayed 9 per cent copper and 13.7 grams per tonne silver (Minister of Mines Annual Report 1916).

The area is mapped as mafic volcanics of the Upper Triassic Karmutsen Formation, Vancouver Group.