On 04 August 2014; the tailings dam at the Mount Polley Mine - Copper/Gold (Imperial Metals) failed.
Attached link shows aerial footage of the extent of the breach.
Tailings Dam Failure
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© Bing Maps
By KRL @ 2014-08-06 08:24:43
KRL
@ 2016-02-11 09:47:43
New imagery shows failure along northeast wall; and debris flow into the lake to the southeast.