History of the Magma Mine, Superior, Arizona – Arizona Daily Independent
"Over the 86-year life of Magma Copper’s Superior project (1911-1996) approximately 27.6 million short tons of ore averaging about 4.9% copper were mined, recovering 1,299,718 short tons of copper, 36,550 short tons of zinc, approximately 686,000 ounces of gold and 34.3 million ounces of silver."
History of the Magma Mine, Superior, Arizona – Arizona Daily...
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