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The solution mining of salt mineral resources may contaminate\udgroundwater and lead to water inrush out of the ground due to brine leakage.\udThrough the example of a serious groundwater inrush hazard in a large salt-mining area in Tongbai County, China, this study mainly aims to analyse the\udsource and channel of the inrushing water. The mining area has three\uddifferent types of ore beds including trona (trisodium hydrogendicarbonate\uddihydrate, also sodium sesquicarbonate dihydrate, with the formula\udNa2CO3  ×  NaHCO3  ×  2H2O, it is a\udnon-marine evaporite mineral), glauber (sodium sulfate, it is the inorganic\udcompound with the formula Na2SO4 as well as several\udrelated hydrates) and gypsum (a soft sulfate mineral composed of calcium\udsulfate dihydrate, with chemical formula CaSO4  ×  2H2O).\udBased on characterisation of the geological and hydrogeological conditions,\udthe hydrochemical data of the groundwater at different points and depths were\udused to analyse the pollution source and the pollutant component from single\udor mixed brine by using physical–chemical reaction principle analysis and\udhydrogeochemical simulation method. Finally, a possible brine leakage\udconnecting the channel to the ground was discussed from both the geological and\udartificial perspectives. The results reveal that the brine from the trona mine is\udthe major pollution source; there is a NW–SE fissure zone controlled by the\udgeological structure that provides the main channels through which brine can\udflow into the aquifer around the water inrush regions, with a large number\udof waste gypsum exploration boreholes channelling the\udpolluted groundwater inrush out of the ground. This research can be a\udvaluable reference for avoiding and assessing groundwater inrush hazards in\udsimilar rock-salt-mining areas, which is advantageous for both groundwater\udquality protection and public health

Mechanism of groundwater inrush hazard caused by solution mining in a multilayered rock-salt-mining area: a case study in Tongbai, China