Abstract:This paper predicts the degree and the range of groundwater leakage pollution in the tailings backfill zone of a manganese mine in karst area. It simulates the temporal and spatial distribution of the pollutant in karst aquifer using the numerical simulation method. The results show that the maximum migration distance of the pollutant will be 300 metres in downstream of the backfill zone during the 30-year simulation period, and nine groundwater protection targets, including decentralized drinking water wells and springs, will be affected by the leakage pollution, but the centralized drinking water source protection area to the north of the backfill zone will not be affected. This paper can provide some references for groundwater pollution prediction in karst area.