Other potential new copper mines are the Carlota project (owned by Quadra FNX Mining) in Pinal County and expected to start in 2008, and Rosemont Copper (owned by Augusta Resources) in Pima County.
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After the Gadsden Purchase brought the southern Arizona into the United States in 1853, the mine was reopened in 1855, and shipped high-grade ore to Swansea in Wales.
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