Host rocks contain veins and large accumulations of pure magnetite in structural or breccia zones, or are impregnated with clots of magnetite in all size ranges. Magnetite is readily liberated from the host material by crushing and the iron removed by magnetic or gravity separation. Veins of pure magnetite in excess of 10 feet thick are common in the open pits and drill intercepts. Oxidation has produced some hematite. The district contains over 500 million tons of measured and indicated iron ore, with more suggested by magnetic and drill hole data.