Andesite of the Jurassic Hazelton Group is intruded by the Legate Creek apophysis of the Cretaceous to Tertiary Coast Plutonic Complex. The central phase of the apophysis consists of adamellite and granophyre.

A shear zone, trending northwest and dipping steeply east, occurs in andesite and contains quartz veins up to 3 metres wide. Mineralization consists of chalcopyrite, tetrahedrite, pyrite, arsenopyrite, sphalerite, bornite and galena. A 1.2 metre sample assayed trace gold, 0.5 per cent copper and 702.9 grams per tonne silver (Minister of Mines Annual Report 1919).

About 300 metres downslope, a quartz vein containing galena assayed 1989 grams per tonne silver, 4.8 grams per tonne gold and 0.2 per cent copper (Minister of Mines Annual Report 1919). A downslope float sample assayed 4613.5 grams per tonne silver, 17.3 grams per tonne gold, 5.93 per cent lead, 8.21 per cent zinc and 0.74 per cent copper (Assessment Report 8777).