As of April 2013, the final permit before mining operations can begin is the Clean Water Act Section 404 permit, issued by the Army Corps of Engineers, which is expected as part of the Forest Service's Record of Decision.
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The United States Fish and Wildlife Service, State Historic Preservation Office, Army Corps of Engineers, and the Forest Service Southwestern Regional Office are still completing their analysis.
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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.