The area is underlain by andesite of the Upper Triassic Karmutsen Formation, Vancouver Group. The area to the west of the volcanics is intruded by a stock of the Early to Middle Jurassic Island Intrusions. These plutonic rocks on Vancouver Island vary in composition from gabbro to quartz monzonite but are mainly granodiorite and quartz diorite.

Three veins occur in a shear zone striking 130 degrees and dipping 27 degrees southwest. The veins are mineralized with pyrite, arsenopyrite, sphalerite, and a little galena.