From 1922 to 1933 the Hirst-Chichagof produced 133,000 ounces of gold and 33,000 ounces of silver from polymetallic quartz veins assaying nearly 1 ounce of gold per ton. There are over a mile of underground workings, reaching 2,000 feet (610 m) below the surface. Significant reserves remain, which have attracted exploration efforts in the 1980s and 1990s.