The area is underlain by the Hazelton Group which is a northwest trending belt of folded volcanic rocks which contains a thick sedi- mentary sequence infolded along a synclinal axis. This group is bounded on the west by the Coast Crystalline Complex and on the east by the Bowser Basin.

The host rock is the Early Jurassic Texas Creek Batholith which is a coarse-grained hornblende granodiorite. The plutonics are cut by quartz porphyry which are locally sericitized. The rocks are cut by quartz veins and stringers, mineralized with galena, sphalerite, tetrahedrite, and minor pyrite and chalcopyrite. Gangue minerals are quartz, barite and minor calcite. The main vein, which strikes and dips 30 to 50 degrees east, varies in width from 10 to 76 centimetres for a strike length of 6 metres. Assays on about 11 tonnes of sorted ore from the vein returned 6 grams per tonne gold, 1065 grams per tonne silver, 44.1 per cent lead and 12.2 per cent zinc (United States Geological Survey, Bulletin 807).

A probable extension to the vein occurs 100 metres to the south- southwest, where it is up to 1 metre thick. A 5.9 tonne sample of sorted ore assayed 10.3 grams per tonne gold, 473 grams per tonne silver, 37.2 per cent lead and 5.6 per cent zinc (United States Geological Survey, Bulletin 807).