In 1915, gold was discovered in the area and the Olympic Mineestablished. A post office was established at Omco in 1917, and remained in operation until 1921. In 1917, the Olympic Mines Company was incorporated, a cyanide plant with capacity of 70 tons was built. The mill burned in 1919 and was rebuilt in 1920. The mill shut down in 1921 after the ore was depleted. Total production was. On December 20, 1932, the shaft collapsed during an earthquake. In 1936, the property was in the process of being rehabilitated.