![]() ![]() The HDPE cover significantly reduced both water recharge to the waste rock (i.e., 512 to 50 mm/year) and AMD seepage to groundwater. Field parameters observed at 46 monitoring wells over a 5-year monitoring period (including hydraulic head, recharge, hydraulic conductivity and water quality) were used as key input and calibration parameters. A 3-D groundwater flow and contaminant transport model of the site was developed in FEFLOW to predict the spatial and temporal evolution of AMD over 100 years. A numerical investigation of a former mining site containing a large WRP reclaimed with an HDPE cover is presented. The objective of this study was to assess the long-term effectiveness of an ‘in-service’ HDPE-lined cover system for reducing AMD contamination at WRP sites. Cover systems containing high-density polyethylene (HDPE) liners have the attributes to be highly effective however, their performance over the long-term is unknown. Remediation at former mining sites containing waste rock piles (WRPs) commonly involves the installation of a cover system over the waste rock to limit water and oxygen ingress and attenuate the impacts of acid mine drainage (AMD) to the environment. ![]()
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