The claims are underlain by Lower to Middle Jurassic Hazelton Group volcanics comprised mainly of andesitic to rhyolitic flows, tuff and breccia. In the southwest section of the claims a small syenite intrusion outcrops and hosts 1 to 1.5 per cent disseminated magnetite.

Source 2 (Joe 1-3 claims) consists of an epidotized, volcanic flow which hosts pyrite, chalcopyrite and pyrrhotite as fracture fillings. The volcanics host less than 0.5 per cent magnetite. Malachite occurs as blebs and as staining along fractures. In 1970 a sample assayed 0.16 per cent copper.