The claims are underlain by Lower Jurassic Hazelton Group rocks (Telkwa Formation), comprised of andesitic flows, tuff, and breccia with intercalated argillite and greywacke. Eocene dikes and sills crosscut the volcanics and are related to the Babine intrusions. They are comprised of granitic to feldspar porphyritic textured diorite with an economically mineralized biotite-hornblende feldspar porphyry member.

Zonal alteration is associated with the mineralized porphyry. Alteration associated with ore grade material is potassic with secondary biotite. A concentric intermediate zone surrounds the secondary biotite and is defined by the presence of fracture con- trolled pyrite with or without quartz carbonate gangue. The outermost zone is defined by the presence of carbonate fracture fillings with or without minor pyrite.

Chalcopyrite is associated with secondary biotite in a small feldspar porphyry dike trending northwest on R-186 and 188 west of Hawthorne Bay. In 1972, the grade was estimated at 0.1 per cent copper over 3.0 metres (Assessment Report 4250). East and west of this occurrence are weakly altered volcanic host rocks which contain carbonate veinlets.

A narrow northwest trending shear on Bab-131 is mineralized with pyrite, chalcopyrite, sericite, and secondary biotite.