Chloritic basalt of the Vancouver Group Upper Triassic Karmutsen Formation is intruded by a monzodiorite to granodiorite stock. These intrusives are part of the Middle to Late Jurassic Burnaby Island Plutonic Suite. A magnetite skarn occurs in the basalt near the intrusive contact and along the trace of the Carnation Creek fault. The skarn measures 5 by 2 metres and contains pyrite veinlets. A grab sample of the massive magnetite, plus minor chalcopyrite, assayed 0.25 gram per tonne gold, 12.8 grams per tonne silver and 1.25 per cent copper (Assessment Report 14818).