Sedimentation rates in two pit lakes: Implications for riverine flow-through as a closure strategy
IMWA 2019 Conference – Mine Water: Technological and Ecological Challenges
Perm State University
School of Science / Centre for Ecosystem Management
Lack of organic matter inputs into a pit lake inhibits ecological development. Connecting a river to a pit lake should add organic matter to the lake. Sedimentation traps and sediment sampling was undertaken in two co-occurring pit lakes: one with river flow-through (Lake Kepwari) and one without (WO5H) in Collie, Western Australia.Carbon in the sediment did not vary between lakes or depths. Sedimentation rates did not vary between lakes during low/no river inflow periods. River inflow did increase sedimentation but without increasing allochthonous inputs of C. Even with river inflow C accumulation in the lakes remains very low.