The largest of the mines are the Sierrita Mine owned by Freeport-McMoRan and the Mission Mine of ASARCO. Compared to other mines in Arizona the two mines are large; Sierrita is low-grade.
The largest of the mines are the Sierrita Mine owned by Freeport-McMoRan and the Mission Mine of ASARCO Compared to other mines in Arizona the two mines are large; Sierrita is low-grade