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The Morenci copper mine, operated continuously since the 1880s, . It transitioned from an underground mine to one of the world's largest open pit mines.
Morenci porphyry copper property has been producing copper for over 100 years. It is now owned by Freeport McMoRan Inc.
Feb 9, 2010 . This astronaut photograph illustrates three open pit copper mines located west northwest of the town of Green Valley, Arizona.
Sep 26, 2013 . The majority of the deepest open pit operations in the world are copper producing mines. Mining technology profiles the world's top ten deepest.
Information on Kennecott Copper Mine, the world's largest excavation and open pit copper mine, located west of Salt Lake City, Utah.
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