The CI and JE claims cover an area underlain by granodiorite of the Jurassic to Tertiary Coast Plutonic Complex, in part covered by basalt and rhyodacite of the Plio-Pleistocene Garibaldi Group. The claims were staked over an area of poor bedrock exposure in the Cheakamus River valley, about five kilometres west of Alta Lake near the village of Whistler.

Only on the east side of the property, where logging road construction has uncovered bedrock, is copper mineralization exposed. Chalcopyrite and malachite occur as minor disseminations and in quartz veins. Several pits along the road on the eastern side of the JE claims expose the mineralization.