The BK polymetallic vein showing, 3.6 kilometres south of Mount Warner, is within andesite agglomerate of the informally named Upper Cretaceous Powell Creek Formation approximately one kilometre north of the contact of Upper Cretaceous rocks of the Coast Plutonic Complex.

Galena, sphalerite and pyrite as disseminations are within silica flooded and sericitic shears that transect gouged and brecciated andesite agglomerate and hornblende feldspar porphyry. The shear zones strike north to east and are 10 centimetres to 20 metres wide.

A 0.9-metre sample of intense clay and sericite altered rocks with quartz veinlets assayed 11.2 grams per tonne silver, 0.01 gram per tonne gold, 4.46 per cent zinc, 0.18 per cent lead and 0.14 per cent copper (Assessment Report 17358, page 19).