Modern mining is nothing like it was a century ago. Today’s massive mines are highly mechanized and use chemicals toxic to aquatic life to extract copper, gold, uranium, and other metals from ore. A recent comprehensive study of modern U.S. mines challenges the perception that today’s practices are adequate to protect water quality
http://thecordovatimes.com/article/1150mining_law_of_1872_is_inadequate_to_regulate
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