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Gold-copper ore, concentrated and leached 16 (2018) [6] 16 Lisbon Valley San Juan County, Utah: Lisbon Valley Mining Company Copper ore, open pit, heap leached 10–15 (2018) [9] 17 Miami: Gila County, Arizona: Freeport-McMoRan: Copper ore, leached 5 (2021) [2] 18 Carlota Gila County, Arizona: KGHM Polska Miedź: Porphyry copper open pit ...
The sheet copper statue was cast by W. H. Mullins Company and depicts Columbus holding a globe. Next to Columbus is a granite pedestal with a dove on top of a globe. [ 2 ] The statue is approximately 9 feet (2.7 m) tall and weighs 150 lbs. [ 2 ]
Many copper mines have existed in the Copper Country of the U.S. state of Michigan. These include both large-scale commercial ventures and small operations. There are hundreds of ancient mining pits in and around the Copper Country area, especially on Isle Royale (several of these were developed).
As the statue was undergoing repair work in 1979, a time capsule in the form of a copper box was discovered. It contained, among other items, a railroad bill of lading for shipment of the statue. [3] The statue was surveyed by the Smithsonian Institution's "Save Outdoor Sculpture!" program in 1992. [3]
The copper is present as sulfides (most commonly chalcocite) and malachite associated with organic material; some native silver is also present. [47] New Mexico is currently the nation's number-three copper-producing state. Copper is produced from two large open-pit porphyry copper operations in Grant County: the Chino Mine and the
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