In August, 2014, the Mount Polley tailings facility failed, releasing some 10 billion litres of water and 4.5 billion litres of slurry into Polley Lake, triggering a state of emergency as water levels rose 1.5m and drinking water for more than 300 residents was compromised.
It was the first, major tailings storage facility (TSF) breach in years and, while not a ...