The area is underlain by Upper Triassic Karmutsen Formation volcanic rocks of the Vancouver Group. These are interbedded with, and overlain to the northeast by a northwest trending belt of Quatsino Formation limestone (Vancouver Group) known historically as the "lime-belt". The Vancouver Group rocks are in fault and/or intrusive contact to the northeast with intrusive rocks of the Juro-Cretaceous Coast Plutonic Complex.

Bunches, lenses up to 1 metre thick, or vein-like masses of quartz and calcite occur irregularly distributed in limestone bordering granitic intrusive rocks. These quartz-calcite masses carry disseminated pyrite, pyrrhotite and chalcopyrite and are reported to strike northeast and dip 75 degrees northwest. A 1.2 metre sample of ore material taken in the bottom of a 2.4 metre shaft assayed trace gold, nil silver and 0.13 per cent copper (Geological Survey of Canada Summary Report 1913).

On the surface within a few metres of the shaft a mass of material about 1 metre wide is composed chiefly of pyrrhotite.