The area is underlain mainly by Lower Jurassic Hazelton Group epidotized and chloritized andesite which has been intruded by east dipping andesite dikes. Two zones of mineralization are present. The mineralization occurs in narrow, irregular fissures or in shear zones. Often the mineralization is in quartz veins where it occurs as irregular lenses and pockets. The veins mainly trend north-south with an east dip of 40 to 80 degrees. Mineralization consists of chalcopyrite, bornite, chalcocite, specularite, malachite, azurite, and pyrite.