Shear zones within argillites of the Jurassic to Cretaceous Bowser Lake Group contain brecciated argillite, which are veined and replaced by quartz and calcite gangue. The shear zones are mineral- ized with pyrite, sphalerite, galena and chalcopyrite. The zones are 1 to 2.5 metres wide and strike north to northwest with 60 to 70 degrees southeast dips. A 60 centimetre sample of a north striking shear assayed 38.7 grams per tonne silver, 3.8 per cent zinc and trace gold (Geological Survey of Canada Memoir 212). A 46 centimetre sample of a northwest striking shear assayed 137 grams per tonne silver, 8 per cent copper, 4.6 per cent lead, 5 per cent zinc and trace gold (Minister of Mines Annual Report 1929).