History and heritage: American mining in the 1920s
In addition, the works comprise a rod and wire mill, which uses from 50,000 to 60,000 tons per annum of the refined copper. Utah mines. The Utah copper mine at Bingham is one of the most remarkable open-cut mines of the world, being situated on a mountain side, with working faces extending over 1000 feet in vertical height, and a mile in length ...
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