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NUMERICAL PREDICTION OF THE LONG-TERM EVOLUTION OF ACID MINE DRAINAGE AT A WASTE ROCK PILE SITE REMEDIATED WITH AN HDPE-LINED COVER SYSTEM
Ramasamy, M., C. Power, and M. Mkandawire.
Journal of Contaminant Hydrology 216:10-26(2018)

This study assessed the long-term effectiveness of an HDPE-lined cover system for reducing acid mine drainage (AMD) contamination at WRP sites via numerical investigation. 3D groundwater flow and contaminant transport model of the site was developed to predict the spatial and temporal evolution of AMD over 100 yrs. Field parameters observed at 46 monitoring wells over a 5-yr monitoring period were used as key input and calibration parameters. The HDPE cover significantly reduced both water recharge to the waste rock and AMD seepage to groundwater. Both the groundwater flow and contaminant transport components of the model were calibrated and verified to the observed field data, with strong correlations evident between observed and simulated hydraulic heads and sulfate concentrations, respectively. Long-term model predictions of AMD evolution indicated significant and continual reductions in sulfate concentrations over time at all well locations. Background concentration levels are expected to be reached within 40 years.



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