Belgian Congo    

Union Minière du Haut Katanga 


Braden Copper Company (El Teniente Copper Mine)


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


Geevor Tin Mine

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