Veins average 3 to 5 feet in thickness, including one as much as 12 feet at the Gowan Mine. Mineralization consists of principally gold with quartz as gangue (worthless material) along with some ...

The gaping mouth of Resolution Copper Mining’s No. 10 shaft is 28 feet across and opens into a sheer drop of nearly 7,000 feet, making it the deepest continuous mine shaft in the United States.

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