The "Porphyry" porphyry copper showing, 4.3 kilometres south of Mount Warner, is within feldspar-hornblende porphyry and adjacent andesite agglomerates of the Upper Cretaceous Powell Creek Formation. These rocks are approximately one kilometre north of the contact with Upper Cretaceous plutonic rocks of the Coast Plutonic Complex.

Mineralization consists of disseminated chalcopyrite, massive chalcopyrite veins, up to 2 centimetres thick and quartz-epidiote- magnetite-chalcopyrite veins. Mineralized porphyry is slightly sericitic and silicic, and adjacent andesite agglomerate is silicic and chloritic. A grab sample of malachite stained quartz veins and slickensided rocks assayed 13.2 grams per tonne silver, 0.057 gram per tonne gold, 0.76 per cent copper and 0.02 per cent zinc (Assessment Report 17358, page 24).