Numerical modeling and environmental isotope methods in integrated mine-water management: a case study from the Witwatersrand basin, South Africa

摘要: Improved groundwater flow conceptualization was achieved using environmental stable isotope (ESI) and hydrochemical information to complete a numerical model with reasonable certainty. The study aimed assess the source of excess water at pumping shaft located near town Stilfontein, North West Province, South Africa. results indicate that intercepted Margaret Shaft comes largely from seepage nearby mine tailings dam (Dam 5) upper dolomite aquifer. If continues current rate Dam 5 is decommissioned, neighbouring shallow farm boreholes would dry up within approximately 10 years. Stable data 50 % pumped recirculated, mainly 5. are supplemented by tritium data, demonstrating recent recharge taking place through open fractures as well man-made underground workings, whereas fissure samples roughly 950 m below ground level exhibit mine-water signatures. Pumping shaft, which captures surface dams, highly recommended option for preventing flooding downstream mines. this research highlight importance additional methods (ESI analyses) improve modelling.