Effect of placer mining on suspended sediment in reaches of sensitive fish habitat |
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| Authors: | S B Pentz R A Kostaschuk |
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| Institution: | (1) Department of Geography, University of Guelph, Guelph, Ontario N1G 2W1, Canada, CA |
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| Abstract: | The McQuesten River system in central Yukon Territory, Canada, contains placer mines and reaches of sensitive fish habitat.
Suspended sediment is supplied to the system by erosion of previously mined disturbed areas, bank erosion, resuspension of
placer sediment deposited on bars, and active placer-mine discharges. Direct discharge from active placer mines did not have
a large impact on suspended sediment in reaches of sensitive fish habitat in 1994–1995, although only two mines were active
and concentrations did periodically exceed water quality objectives. Erosion of previously mined disturbed areas had a pronounced
effect on suspended sediment during spring snowmelt and summer rainstorms in 1994–1995. Deposits in previously mined areas
should be stabilized to reduce erosion and its downstream impact on fish habitat.
Received: 10 November 1997 · Accepted: 30 March 1998 |
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| Keywords: | Placer mining Suspended sediment Fish habitat |
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