Underlying rocks are quartz-sericite schist and chlorite schist with interlayers of phyllite, slate, chert and sericitic quartzite of the Devonian part of the Eagle Bay Formation. The rocks dip shallowly to the north.

Quartz veins and fractures contain minor galena and pyrite. A 35 centimetre sample across a seam assayed 7.4 per cent lead, 1 per cent zinc, 82.3 grams per tonne silver and trace gold (Annual Report 1927).