The area is underlain by an overturned sequence of mafic and felsic volcaniclastics and volcanic rock with thin graphitic shale beds (Unit 3) that may include Early Paleozoic to Early Mesozoic strata. The shale contains disseminated pyrite, pyrrhotite, chalco- pyrite and likely sphalerite. A sample assayed 0.52 per cent zinc (Assessment Report 16036).