San Manuel Mine was once the world’s largest underground copper mining operation in size of ore body, production capacity and infrastructure.

Principal mines in the area included the Mohawk Mine, Collins Mine and Mammoth Mine, with workings averaging 500 to 700 feet. The Collins vein reached a depth in excess of 1,100 feet.

A retired North Dakota coal mine is set to become the new home of a nickel processing plant. Minnesota-based Talon Metals and Westmoreland Mining Co. signed an agreement Wednesday that gives Talon ...

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