The host rock is Lower Cretaceous Skeena Group argillite which is intruded by dikes and sills of aplitic to granodioritic composi- tion and related quartz veins associated with a Cretaceous quartz monzonite stock.

Quartz infilling in fractures exhibits a cockscomb texture with intergrown crystals projecting toward the centre of the vein. In two of these veins crystalline galena and chalcopyrite were interstitial to the quartz. The sulphides are confined to a narrow band of less than 30 centimetres in width.

Disseminated pyrite is found as shear mineralization along the bedding planes in the argillite.