Mount Polley isn’t unusual in taking waste from ore 
processing — known in the industry as mine tailings — and storing it in a
 pond or lake. Nor was this week’s accident the first of its kind: The 
failure of a tailings dam at a Boliden AB mine in Spain in 1998 caused 
huge environmental damage.
Tailings management was already a focus for regulators. 
Vancouver-based Taseko Mines Ltd. had its proposed New Prosperity copper
 and gold mine in British Columbia rejected by the federal government in
 February over concerns about its impact on a lake. Taseko said at the 
time it disagreed with the decision.https://bangordailynews.com/2014/08/08/news/nation/dam-burst-threatens-canada-mines-over-environmental-concerns/
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