Tailings ponds: What’s in them and what risks do they pose?

What are tailing ponds and what’s in them? What risks do they pose to the environment? Here are the answers to some of the questions you might have.

Source: http://www.cbc.ca/news/technology/tailings-ponds-for-mining-and-oilsands-waste-faqs-1.2727889?cmp=rss