The claims are underlain by Lower Jurassic Hazelton Group volcanics of the Telkwa Formation, comprised mainly of andesitic to rhyolitic flows, tuff and breccia. South of the property the Hazel- ton rocks are underlain by Upper Triassic Takla Group volcanics comprised of dark green tuffs, flows and shales. North of the property, Tertiary Endako Group volcanics of the China Nose Breccias (Geological Survey of Canada Open File 351) overlie the Hazelton rocks. They are comprised of very magnetic, uniformly black, basaltic flows and sediments.
The Hazelton rocks are comprised of variegated red, maroon to green breccia and tuff. Anhydrite infills fractures with calcite infilling in cavities and veinlets. Epidote is abundant. The volcanics are crosscut by a beige to buff coloured porphyry dike. The dike is 20 metres wide and hosts angular laths of bleached feldspar and rounded quartz eyes. Alteration consists of sericite and kaolinite minerals with 1.0 to 2.0 per cent disseminated pyrite and malachite. Malachite occurs in fractures or as rims on pyrite and chalcopyrite grains.
Near the quartz-feldspar porphyry dike of quartz monzonite composition, is a mineralized shear zone striking 160 degrees and dipping 70 degrees west. The gouge zone hosts fault breccia cemented with quartz and clay. It is bleached to pale green and hosts minor specular hematite. The shear cuts grey rhyolite and an andesitic fragmental rock with siderite, epidote, calcite, and malachite in the fractures.
In 1927, the Jack Rabbit mineralized shear was sampled. A 40 centimetre vein sample assayed 42.5 grams per tonne gold, 171.4 grams per tonne silver, and 9.4 per cent copper. Another 120 centi- metre sample assayed 10.3 grams per tonne gold, 89.1 grams per tonne silver, and 2.5 per cent copper (Minister of Mines Annual Report 1928, page 117).
In 1986, a grab sample of highly oxidized dump material assayed 0.28 grams per tonne gold, 4.1 grams per tonne silver, and 1.82 per cent copper. Also, a chip sample across 1.5 metres above a collapsed adit assayed 4.9 grams per tonne gold, 6.5 grams per tonne silver, and 0.22 per cent copper (Assessment Report 16071).
Widespread weak copper mineralization ranging from 0.02 to 0.07 per cent, is reported to occur in intrusive and volcanic rocks away from the vein and within an area about 60.0 metres in length along a creek east of the Jack Rabbit showing. In 1966, two samples taken above an old tunnel assayed 0.27 and 0.17 per cent copper.