In 1880, miners and emigrants came from across the country and around the world to work deep underground in the Old Dominion Mine of Globe, Arizona, one of 35 mines in the rich ore deposits of the Pinal Mountains. Within the first decade, the Old Dominion extracted over 22 million tons of copper ore, and while the mine has been closed for decades, copper mining is still a major industry in the Globe-Miami area.– Courtesy Gila Co
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