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• W2022216942 abstract "Numerical simulations of layered, sulphide-bearing unsaturated waste rock piles are presented to illustrate the effect of coupled processes on the generation of acid mine drainage (AMD). The conceptual 2D systems were simulated using the HYDRUS model for flow and the POLYMIN model for reactive transport. The simulations generated low-pH AMD which was buffered by sequential mineral dissolution and precipitation. Sulphide oxidation rates throughout the pile varied by about two orders of magnitude (0.004-0.4 kg m-3 year-1) due to small changes in moisture content and grain size. In the fine-grained layers, the high reactive surface area induced high oxidation rates, even though capillary forces kept the local moisture content relatively high. In waste rock piles with horizontal layers, most of the acidity discharged through vertical preferential flow channels while with inclined fine grained layers, capillary diversion channeled the AMD to the outer slope boundary, keeping the pile interior relatively dry. The simulation approach will be useful for helping evaluate design strategies for controlling AMD from waste rock." @default.
• W2022216942 created "2016-06-24" @default.
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• W2022216942 date "2005-08-01" @default.
• W2022216942 modified "2023-09-25" @default.
• W2022216942 title "Numerical simulations of pyrite oxidation and acid mine drainage in unsaturated waste rock piles" @default.
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• W2022216942 doi "https://doi.org/10.1016/j.jconhyd.2005.06.005" @default.
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