Argonaut Gold is proposing to create an open pit gold mine. If the project goes through, the company will dig out 200 million tons of rock during the next decade; several hills in the mountain range will be all-but-destroyed. Roughly a quarter of this mass will be processed with a cyanide solution to extract the gold and the leftover material will then be stored in a large hole in the ground lined with plastic. The remaining 150 million tons will be piled up as new hills, unconfined and open to the elements.
http://www.earthisland.org/journal/index.php/elist/eListRead/proposed_gold_mine_in_baja_splits_miners_and_farmers
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