Huge mine tailings dams - like the one that burst at the Mount Polley Mine in 2014 - pose a serious risk to the health of British Columbia's most important salmon watershed: the Fraser River. These massive dams are holding back increasing amounts of mine waste mixed with water, and some mines are even permitted to release effluent directly into waterways.  The health of the region's indigenous people and world famous salmon runs are at stake. It's time to ban risky tailings ponds and clean up BC's mining industry.