Seasonal turnover of sediment from Quesnel Lake is sent down the river every year
Every winter since the tailings pond breach at the Mount Polley mine in 2014, copper-laden sediment from the bottom of Quesnel Lake has been re-suspended in the water column and has flowed into the Quesnel River affecting aquatic life in the watershed, according to a new paper by UNBC researchers Phil Owens and Ellen Petticrew.
This process lifts the copper-rich mine tailings and other sedimentary material from the bottom of the lake and the current takes it downstream to the Quesnel River, a tributary of the Fraser River. After the Mount Polley mine tailings pond breach, Most of the material went down a small creek and into Quesnel Lake, the third deepest lake in North America and an important lake for Pacific salmon.
The research team tested the water and sediment at four sites using three different techniques over seven years, beginning shortly after the incident in 2014.
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