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Sacramento Pit copper mine at Bisbee, Arizona. This is a pit 435 feet deep. In 1911 a shaft was sunk into the slopes of the east wall. In 1917 a dynamite charge blew off the top rock of the crown and dredges were worked to excavate the pit's ore bodies. By 1931 the pit floor was too narrow for dredg
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Credit lineSacramento Pit copper mine at Bisbee, Arizona. This is a pit 435 feet deep. In 1911 a shaft was sunk into the slopes of the east wall. In 1917 a dynamite charge blew off the top rock of the crown and . 1940. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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