Nearly a decade later, scientists monitor effects of 18 million cubic metres of copper mine sediment
Since before the Mount Polley Mine tailings breach in 2014, Quesnel River Research Centre has been studying the Quesnel River watershed and its aquatic environment.
Interestingly, for several weeks after the spill, sediment was actually flowing up lake, before then flowing down the lake towards the Quesnel River. However, some of what has been observed so far includes a resuspension of the tailings sediment, leading to higher levels of these elements, during times of lake turnover. Turnover occurs when the stratified levels of the lake caused by temperature differences between the surface and the deeper levels breaks down as the surface and deep water reach similar temperatures.
Higher levels of phosphorus have also been found after the spill, which has implications for the aquatic ecosystem, as phosphorus is associated with higher algae growth and can impact the quality of habitat for some species of fish, including salmonid species. The QRRC researchers are utilizing a number of different study methods, and have had a number of projects ongoing and have drawn on previous research done in the area to compile their current findings.
France Dernières Nouvelles, France Actualités
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