Identification of the effects of shallow-buried mining on the hydrochemical evolution of phreatic groundwater in arid and semi-arid regions: A case study of the Ten Tributaries Basin
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Abstract: Revealing the evolution of phreatic water hydrochemistry under natural processes and mining activities in shallowly buried mining areas of arid and semi-arid regions is key to identifying the impacts of mining on groundwater. Taking the Ten Tributaries Basin in the upper Yellow River as the study area, this study combined ion ratios, stable isotope tracing, and the Chemical Mass Balance (CMB) model to reveal and quantify the effects of coal mining (recharge area) and mirabilite mining (discharge area) on phreatic water chemistry. Results show that mining activities are the key anthropogenic factor driving the spatial differentiation of phreatic water chemistry, with influence intensity exhibiting significant spatial heterogeneity. In undisturbed areas, natural dissolution processes contribute more than 80% of the hydrochemical composition, dominated by carbonate dissolution. However, in mining-affected areas, groundwater chemistry deviates from natural evolutionary pathways, characterized by enhanced dissolved-ion input and more complex ionic compositions. In recharge areas, coal mining mainly promotes carbonate dissolution and vadose-zone disturbance, increasing TDS by factors of 1.96 and 1.88, respectively, relative to natural conditions. In discharge areas, mirabilite mining is dominated by evaporite dissolution and deep saline-water mixing, leading to TDS increases by the factors of 4.41 and 3.24, respectively. These mining effects are superimposed on the pathway-controlled groundwater flow system, resulting in distinct spatial differentiation of groundwater hydrochemistry. The improved CMB model effectively quantifies the impacts of mining disturbances on groundwater chemistry. The results provide scientific support for groundwater resource management and ecological protection in shallowly buried mining areas of arid and semi-arid regions.
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Key words:
- Mineral deposit mining /
- Hydrogeochemistry /
- Leaching /
- Flow path /
- Chemical Mass Balance /
- Contribution rate
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Figure 2. Hydrogeological setting of the study area
(a) Division of the Ten Tributaries units and phreatic water flow field; (b) Stratigraphic profile of the Hashila River, modified from Wu (2016).
Table 1. Statistical summary of phreatic water chemical component analyses in the Ten Tributaries Basin
Water sample type Statistic pH TDS TH Na+ K+ Ca2+ Mg2+ Cl− HCO3− SO42− Recharge area Max 8.57 791.00 523.97 193.82 10.87 104.81 68.22 214.82 519.89 205.50 Min 6.70 243.54 177.66 12.20 0.41 33.70 9.12 12.40 116.50 9.13 Mean 8.03 529.83 292.19 77.77 2.93 67.68 36.31 66.56 283.84 93.33 SD 0.58 174.88 108.29 46.95 2.67 23.29 16.72 52.15 112.47 59.71 CV 0.07 0.33 0.37 0.60 0.91 0.34 0.46 0.78 0.40 0.64 Runoff area Max 8.58 1,440.00 645.08 310.00 6.21 119.84 84.03 220.50 552.84 281.50 Min 7.94 227.13 172.16 9.96 1.43 30.06 20.43 12.76 62.24 44.67 Mean 8.30 586.41 293.47 85.93 3.72 55.61 36.72 69.20 257.13 118.05 SD 0.17 375.28 154.12 94.86 1.54 26.34 23.26 69.24 153.88 77.28 CV 0.02 0.64 0.53 1.10 0.41 0.47 0.63 1.00 0.60 0.65 Discharge area Max 8.53 1,093.02 624.90 261.64 8.81 127.00 79.53 176.90 856.11 233.43 Min 8.04 366.00 238.20 45.60 3.19 22.44 27.50 38.30 231.50 36.02 Mean 8.30 789.33 422.96 131.29 4.72 70.48 59.88 88.83 486.00 107.37 SD 0.17 206.20 126.74 80.16 1.74 33.63 19.29 44.09 198.92 62.49 CV 0.02 0.26 0.30 0.61 0.37 0.48 0.32 0.50 0.41 0.58 Transition area Max 8.79 3,990.36 1,176.06 983.64 14.50 188.38 171.39 1,090.18 689.60 1,301.67 Min 6.87 323.98 215.19 20.50 1.54 20.64 12.52 27.65 152.60 9.13 Mean 8.13 1,049.56 471.78 200.79 4.40 84.67 63.20 189.20 430.55 187.98 SD 0.45 725.07 217.04 214.16 2.56 42.13 36.10 247.93 137.64 236.26 CV 0.05 0.69 0.46 1.07 0.58 0.50 0.57 1.31 0.32 1.26 Coal mining area Max 8.43 3,656.05 1,776.60 690.12 7.45 438.07 213.93 736.65 568.71 1,781.99 Min 7.70 344.50 229.20 34.30 1.27 47.30 26.70 33.32 161.00 69.50 Mean 8.08 1,634.39 873.47 219.67 3.62 179.33 103.37 258.04 388.61 578.21 SD 0.29 1,165.81 613.51 212.39 2.20 128.55 81.03 234.01 141.20 577.90 CV 0.04 0.71 0.70 0.97 0.61 0.72 0.78 0.91 0.36 1.00 Mirabilite mining area Max 9.54 13,038.79 3,016.21 3,584.87 85.04 441.88 536.26 3,178.09 1,083.72 5,609.90 Min 8.11 764.02 52.55 118.71 0.87 6.76 7.29 72.68 274.58 4.80 Mean 8.69 2,995.37 798.65 790.96 12.87 100.80 132.86 747.26 547.63 869.17 SD 0.59 4,264.77 1,130.73 1,121.12 25.69 138.93 198.15 1,098.93 301.55 1,766.05 CV 0.07 1.42 1.42 1.42 2.00 1.38 1.49 1.47 0.55 2.03 Note: The CV and pH are dimensionless; water temperature is in °C; all other components are in mg/L. Table 2. Results of stable hydrogen and oxygen isotope analyses of groundwater
Water sample type ISO01 ISO02 ISO03 ISO04 ISO05 ISO06 ISO07 ISO08 ISO09 ISO10 ISO11 δD (‰) −72.80 −67.21 −54.30 −61.93 −56.00 −70.91 −70.31 −67.82 −67.52 −63.24 −58.25 δ18O (‰) −10.26 −9.52 −8.24 −7.96 −7.43 −9.34 −10.11 −9.95 −8.96 −8.12 −8.05 Table 3. Contribution rates of different end-members to groundwater components in various regions (%)
Subarea Silicate dissolution Carbonate dissolution Evaporite dissolution Meteoric water Mining activity Recharge area 33.85 36.97 21.31 2.07 5.80 Runoff area 34.97 37.23 21.33 2.73 3.74 Discharge area 24.82 37.48 30.58 1.70 5.42 Transition area 28.35 29.78 24.84 1.96 15.07 Coal mining area 25.02 28.59 17.80 1.26 27.33 Mirabilite mining area 20.73 17.06 34.81 1.08 26.32 Whole basin 28.47 30.95 24.89 1.86 13.83 -
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