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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 » OreBurdenxx9276

Removing the Overburden
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Published March 27, 2012 at 1737 × 1048 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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