Belgian Congo
Union Minière du Haut Katanga
Chile
Braden Copper Company (El Teniente Copper Mine)
Mexico
American Smelting and Refining Company - Angangueo Unit
Compania Minera Asarco, S.A. - Parral Plant
Compania Minera Asaarco, S.A. - Santa Barbara Plant
The Fresnillo Company - Buenos Aires Unit
The Fresnillo Company - Plateros Unit
England
Geevor Tin Mine