Eocene Ootsa Lake volcanics comprised of rhyolitic to dacitic flows, tuffs, and breccias with minor andesite are in fault contact with older Hazelton Group rocks. The Lower Jurassic Hazelton rocks (Telkwa Formation) are comprised of variegated red to maroon breccias, tuff, andesite with basaltic to rhyolitic flows.

Native copper was found in the trachytic basalt/andesite vol- canics. Associated mineralization in these tuffs and flow rocks of Telkwa Formation are malachite, chalcocite, minor tetrahedrite, bornite and traces of chalcopyrite.

Mineralization occurs in four modes as follows: 1) associated with quartz-calcite in large fracture fillings 2) found as small fracture infillings 3) minerals occur as small circular concretions with quartz, calcite, and minor epidote in the amygdaloidal cavities within vesicular basalt 4) minor chalcopyrite occurs with hematite and traces of malachite in small fractures within a hematitic andesite tuff.

In 1982, mineralized grab samples assayed 5.49 grams per tonne silver, 0.66 per cent copper and 1.71 grams per tonne silver, 0.3 per cent copper, respectively.