The area is underlain by granodiorite of the Cretaceous-Tertiary Coast Plutonic Complex with roof pendants of limestone and greenstone to the east and south.

Small massive pyrite nodules and unidentified massive sulphides occur within the intrusive rocks. A sample assayed 8.6 grams per tonne silver, 0.03 per cent copper, 0.03 per cent lead, and 0.03 per cent zinc (Assessment Report 8110).