@article{Rabindra Neupane_Bithin Datta_2020, title={GROUNDWATER FLOW AND MULTI-COMPONENT REACTIVE TRANSPORT SIMULATION OF ACID MINE DRAINAGE AT A FORMER MINE SITE}, volume={19}, url={https://geomatejournal.com/geomate/article/view/1105}, abstractNote={<p>Contamination of groundwater resources due to Acid Mine Drainage (AMD) is one of the <br>severest environmental problems. Understanding complex geochemical processes responsible for the<br>generation of AMD within the mine waste deposits is imperative for effective management and remediation of <br>contaminated mine sites. A multi-component reactive transport simulation is developed based on PHT3D to <br>simulate the geochemical evolution of AMD at the Rum Jungle Mine site that has undergone a long history of <br>groundwater contamination. The reactive transport simulation utilized hydraulic head distribution obtained <br>from MODFLOW based calibrated flow model. Geochemical processes considered for the reactive simulation <br>were conceptualized based on previous geochemical characterization and the contaminant of concerns were<br>limited to copper, iron, manganese, aluminum, zinc, and pyrite minerals considering their environmental <br>significance. The simulation results showed that the simulated plume followed mobility pattern dominated by <br>oxidation of sulfide minerals resulting in AMD and subsequent escalation in the concentration of dissolved <br>metals. Simulated and observed concentration for different reactive species appeared to be in a similar range <br>implying reasonable approximation of the physical system. The detailed calibration of reactive transport <br>simulation is restrained by uncertainties associated with aquifer heterogeneity, sparsity in available <br>information, and inaccurate understanding of the geochemical processes.</p>}, number={76}, journal={GEOMATE Journal}, author={Rabindra Neupane and Bithin Datta}, year={2020}, month={Dec.}, pages={188–196} }