The host rocks are Lower Jurassic Hazelton Group volcanics of the Nilkitkwa Formation, which are altered and deformed by a Late Cretaceous to Eocene granodiorite intrusion.

The showing is within a shear zone in the porphyritic andesite to basalt which strikes 350 degrees and dips 63 degrees southwest. Mineralization includes chalcopyrite, pyrite, galena, sphalerite with malachite staining and quartz gangue. The host rock is highly altered and bleached. In 1929, a sample from this shear zone assayed 13.7 grams per tonne silver, trace gold and 4.5 per cent zinc (Minister of Mines Annual Report 1929, page 168).

On the north side of the shear, up to 1530 metres in elevation, quartz veins crosscut the volcanics and host minor galena, sphalerite and chalcopyrite.