The claims are underlain by Lower Jurassic Hazelton Group vol- canics of the Nilkitkwa Formation. They are comprised of maroon to green to grey basalt with andesitic to dacitic pyroclastics including dense, fine-grained tuff, vitric tuff, lapilli tuff, phyllite, shale, siltstone and conglomerate.

The mineralization occurs in a number of near parallel fissures with quartz and quartz-carbonate infilling in the andesite. The fracture/fissures strike approximately northwest and dip northeast and appear to conform with the bedding planes of the enclosing tuffs. Ten fissures occur over 460 metres and mineralization is reported to vary from 1.2 to 12 metres in width along the flow top shears. Sulphide mineralization is restricted to quartz-sulphide lenses and veins in the shear zones and includes chalcopyrite, tetrahedrite, and minor galena, bornite, chalcocite, and pyrite.

In 1970, samples collected from seven of the Harvey quartz vein showings assayed: 0.90 per cent copper, 735.76 grams per tonne silver and 0.21 grams per tonne gold (Assessment Report 3277).

Between 1917 to 1927, 14 tonnes of ore was mined and produced 70,573 grams silver, and 1989 kilograms copper.