The Harshaw district in the Patagonia Mountains covers 40 square miles, but it produced 1.3 million tons of ore between the 1850s and early 1960s — including an abundance of zinc, lead, silver and ...
Ajo, in western Pima County 125 miles west of Tucson, has one of Arizona’s best-known porphyry copper deposits. It enticed small mining operations by the San Francisco syndicate known as the American ...
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