Regionally the area is predominantly underlain by basaltic volcanic rocks of the Upper Triassic Karmutsen Formation (Vancouver Group). The basalts range from feldspar porphyritic to augite porphyritic with amygdaloidal and aphanitic varieties also present. Pillow basalt flows are common. Limestone occurs locally as narrow lenses with limited lateral extent.

The Frisky occurrence area is underlain by basalt and andesite of the Karmutsen Formation intruded by at least two diorite stocks. Major shearing and faulting is evident at and near the intrusive contacts. The shear zones commonly host quartz-carbonate (iron carbonate) veining. Quartz veins also occur within both the volcanic and intrusive rocks. Mineralization comprises small amounts of chalcopyrite, pyrite and pyrrhotite within the veins.

Grab samples from several pits assayed up to 0.1 per cent copper, greater than 1.0 per cent lead, 0.43 per cent zinc, 1.09 grams per tonne gold and 26.0 grams per tonne silver (Assessment Report 17301).