The area is dominated by a Cretaceous to Tertiary diorite pluton and quartz diorite to dioritic gabbro sills of the Coast Plutonic Complex. Thin, discontinuous rafts of sedimentary rocks occur within the intrusions. Younger granodiorite sills intrude the sediments and diorites. To the northeast, lie a thick (>300 metres) sequence of pyroxene porphyry tuffs, flows and agglomerates with rhyolite lenses. Strike slip faults, with offsets of up to 100 metres are numerous and strike 060 to 080 degrees.

Quartz veins in diorite contain galena stringers, chalcopyrite, pyrrhotite and sphalerite. A grab sample assayed 1.55 per cent lead, 73.0 grams per tonne silver, 0.12 per cent zinc and 0.13 per cent copper. A quartz vein in granodiorite with pyrite and arsenopyrite, 100 metres to the south, assayed 0.24 grams per tonne gold. Graphitic sediments, 400 metres to the south, assayed 0.07 per cent zinc (Assessment Report 12777).