Narrow zones of Paleozoic to Mesozoic metasedimentary rocks, consisting of limestone, laminated quartzite and argillite occur in a wide belt of weakly metamorphosed volcanic rocks consisting of tuffs and greenstones. The rocks are intruded by Cretaceous to Tertiary diorite stocks and dykes of the Coast Plutonic Complex.

Sphalerite, chalcopyrite, pyrite and pyrrhotite occur in skarn zones, quartz veins and shear and fracture zones in the metavolcanic rocks. A surface sample assayed 8.0 per cent zinc, 0.11 per cent copper and 1.37 grams per tonne silver (Assessment Report 5027).