New Alberta government research has found windblown dust from mountaintop removal coal mines has polluted a pristine alpine lake to the point where its waters are as contaminated as lakes downwind from the oilsands.
The paper, published last week in the journal Environmental Science and Technology, concludes that it’s crucial to consider more than just downstream effects from such mines.We deliver the local news you need in these turbulent times on weekdays at 3 p.m.By clicking on the sign up button you consent to receive the above newsletter from Postmedia Network Inc. You may unsubscribe any time by clicking on the unsubscribe link at the bottom of our emails. Postmedia Network Inc.
The paper examines Window Mountain Lake, a small, remote alpine lake in southern Alberta accessible only on foot just across the continental divide from coal mines in British Columbia’s Elk Valley. The lake is unconnected to the coal-mining area by any water body, nor does it have coal deposits.They analyzed the layers for chemicals associated with coal, such as polycyclic aromatic compounds and selenium. The former are known carcinogens and the latter is toxic to fish.
During the past decade, those compounds reached 30 times pre-industrial levels. Some now exceed Canadian guidelines for the protection of aquatic life. A similar pattern was found for selenium. Levels of the compound roughly doubled from pre-industrial levels by the mid-1980s, as did the rate of deposition.But Bill Donahue, a former chief of environmental monitoring for the department who has seen the study, said it shows mountaintop mining affects more than the rivers and streams that flow from it and has impacts that cross watersheds.
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