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GREEN VALLEY’S ASARCO DISCOVERY MINE TOUR SHOWS THE BEST AND WORST OF COPPER MINES AND THE ART OF HARDROCK MINING » 28 PER CENT PURE 9321

Ten pounds of 28per cent pure copper ore comes from a ton of raw rock…

Published March 27, 2012 at 823 × 1436 in GREEN VALLEY’S ASARCO DISCOVERY MINE TOUR SHOWS THE BEST AND WORST OF COPPER MINES AND THE ART OF HARDROCK MINING

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