Andesite and volcanic tuffs and breccias of the Jurassic Hazelton Group are cut by a 1.2 metre wide quartz porphyry dyke. The altered zone on both sides of the dyke, which strikes 120 degrees and dips 75 degrees southwest, contains quartz veins with minor chal- copyrite, bornite, galena and malachite. The zone extends for about 300 metres along strike and is one metre wide. A typical sample assayed 0.20 per cent copper and 8.9 grams per tonne silver (Geological Survey of Canada Memoir 212).