The area is underlain by Jurassic to Cretaceous Bowser Lake Group sediments comprised of bedded sandstones, greywacke, graphitic shales and breccia. Locally, a fine-grained aplite dyke cuts the sediments.

On the Hunter claim group, a quartz vein cuts brecciated sediments and strikes 310 degrees and dips 55 degrees to the northeast. The vein averages about 76 centimetres in width, and locally contains calcite. Mineralization consists of irregular patches and specks of tetrahedrite, chalcopyrite, galena and sphalerite. In 1930, a 0.6 metre sample of the best mineralized section of the vein assayed trace gold, 78.85 grams per tonne silver, 3.2 per cent lead, 0.5 per cent zinc and 0.8 per cent copper (Minister of Mines Annual Report 1930, page 76).