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Numerical modeling of the groundwater contaminant transport and hydraulic control in a decommissioned acid in-situ leaching uranium mine
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Wen-jie QIU1, Gen-mao ZHOU2, Jian-min CHU1, Yin-quan DING2, Yun YANG3, Ting ZHU2, Jian-feng WU1, *, Ji-chun WU1
China Environmental Science | 2025, 45(5) : 2558 - 2568
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China Environmental Science | 2025, 45(5): 2558-2568
• Water Pollution Control •
Numerical modeling of the groundwater contaminant transport and hydraulic control in a decommissioned acid in-situ leaching uranium mine
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Wen-jie QIU1, Gen-mao ZHOU2, Jian-min CHU1, Yin-quan DING2, Yun YANG3, Ting ZHU2, Jian-feng WU1, *, Ji-chun WU1
Affiliations
  • 1.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
  • 2.CNNC Xinjiang Mining Co., Ltd, Urumqi 830101, China
  • 3.School of Earth Science and Engineering, Hohai University, Nanjing 211100, China
Published: 2025-05-20
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This study focuses on a decommissioned mining area of acid in-situ leaching in Xinjiang. By analyzing long-term groundwater monitoring data, a three-dimensional transient groundwater flow and contaminant solute transport model was developed to simulate the migration of contaminant species（U（Ⅵ）and ）in the ore-bearing aquifer. The study aims to provide a reasonable hydraulic control strategy to ensure the groundwater environmental safety in the decommissioned mining area. The results indicate that the post-decommissioning groundwater flow field is generally consistent with the direction of the natural flow field. High concentrations of U（Ⅵ）and remains extensively in the mining area and gradually migrate and diffuse downstream under the influence of groundwater dynamics. The constructed model successfully reproduces the observed groundwater level trends in the decommissioned mining area and accurately simulates the downstream migration and diffusion of U（Ⅵ）and from within the mining area. This demonstrates that hydraulic control is a crucial measure for ensuring the ecological safety of the downstream groundwater environment in future conditions. Analysis of three hydraulic control pumping schemes revealed that a combined internal and external pumping strategy yielded the best control results. Using a comprehensive evaluation method to quantitatively assess each scenario, the optimal solution was determined to involve installing six pumping wells downstream and three pumping wells within the mining area, each operating at a pumping rate of 60m3/day. This approach achieves effective source reduction within the site and hydraulic containment downstream, keeping contaminant migration within a 50m range at relatively low cost. By employing the developed numerical model to compare and select hydraulic control strategies under future planning conditions, this study provides a scientific basis for decision-making on groundwater environmental safety in the mining area and offers valuable insights for the remediation of similar decommissioned in-situ leaching uranium mines.

decommissioned mining area  /  numerical simulation  /  solute transport  /  hydraulic control
Wen-jie QIU, Gen-mao ZHOU, Jian-min CHU, Yin-quan DING, Yun YANG, Ting ZHU, Jian-feng WU, Ji-chun WU. Numerical modeling of the groundwater contaminant transport and hydraulic control in a decommissioned acid in-situ leaching uranium mine[J]. China Environmental Science, 2025 , 45 (5) : 2558 -2568 .
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Year 2025 volume 45 Issue 5
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Article Info
  • Receive Date：2024-09-05
  • Online Date：2026-03-18
  • Published：2025-05-20
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  • Received：2024-09-05
Funding
Affiliations
    1.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
    2.CNNC Xinjiang Mining Co., Ltd, Urumqi 830101, China
    3.School of Earth Science and Engineering, Hohai University, Nanjing 211100, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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