The host rock is comprised of Lower Jurassic Hazelton Group volcanics which consist largely of andesite, rhyolite, intercalated tuff and greywacke beds. These are intruded by the Late Cretaceous Bulkley Intrusions described as a fine to medium-grained granite stock. A strong shear, striking 135 to 150 degrees and dipping 60 to 75 degrees southwest, was traced with open cuts from the granite stock to the volcanics. Near the contact, tuffs are impregnated with sphalerite, arsenopyrite, pyrite and chalcopyrite across a width of 0.6 metres. Further southeast, the zone widens and a 76 centimetre channel sample assayed 4.1 grams per tonne gold, 19.2 grams per tonne silver, 1.6 per cent zinc and 0.21 per cent copper (Geological Survey of Canada Memoir 223, revised edition, 1954, page 130).

A quartz vein, located southeast of the open cut mentioned above, hosts abundant arsenopyrite with minor pyrite and sphalerite. The wall rock is altered and bleached to a yellow hue. A represent- ative sample of the vein quartz and arsenopyrite assayed 6.9 grams per tonne gold.

At 1448 metres elevation, another quartz vein is exposed in two open cuts. The vein ranges from 30 to 45 centimetres in width, and the quartz carries abundant arsenopyrite and a little sphal- erite. A typical sample (collected by Kindle 1954) assayed 3.4 grams per tonne gold and 0.6 per cent zinc (Geological Survey of Canada Memoir 223).