What can be done to prevent these spills from happening? Globally, more than 3,500 dams have been created to store toxic mine waste. These dams aren’t temporary solutions; they’re intended to store the waste permanently, for all time. Given the number of dams and the fact that they never go away, spills of this sort will always be hard to stop completely. Indeed, in the month since the Mount Polley disaster, there’s been another spill at a copper mine in Mexico
http://www.brilliantearth.com/news/gold-mine-in-british-columbia-spills-toxic-sludge/
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