find equally. Initially the mine's ore was shipped directly to San Francisco for processing. Shortly thereafter, a smelting operation was set up several miles from the mine along the Arnett Creek. A mining camp, which grew into Pinal City, quickly formed at the processing site. Initially operating the mine together, Copeland sold his interest to Mason in June 1876 with Long selling his interest several months later to Regan. Mason and Regan, who had spent US$80,000 to buy out their partner's interests, later sold their interests to James M. Barney for US$250,000 and US$300,000 respectively. The operations continued until 1888, when a combination of deteriorating ore quality and lower silver prices prompted the mine to close. Sporadic, small-scale mining continued into the 1980s. Recorded production 5,943,157 oz. Ag, valued at $6,526,094 (1875-1889), and 232,764 oz. Ag valued at $252,674 (1918-1928) (period values). Notes References External links Silver King – Ghost Town of the Month at azghosttowns.com Geography of Pinal County, Arizona Arizona Territory Mines in Arizona Silver mines in the United States Buildings and structures in Pinal County, Arizona 1875 establishments in Arizona Territory Ghost towns in Arizona