Lower Jurassic(?) Hazelton Group andesite volcanic flows and tuff host narrow (less than one centimetre), discontinuous, malachite stained quartz veins with disseminated pyrite plus or minus chalco- pyrite. The volcanic rocks are moderately east-dipping and uncon- formably overlain by flat-lying Upper Cretaceous-Paleocene(?) Sustut Group polymictic conglomerate. Host rocks display weak propylitic alteration with patches of epidote in a dark green chlorite-altered groundmass. A rusty weathering zone (over 50 metres by 50 metres) of highly fractured andesite with 1-290 disseminated pyrite contains rare, two to three centimetre wide quartz veins with lenses of coarse pyrite and patches of finer, dark grey pyrite.