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Acid mine drainage (AMD) resulting from open-pit and underground mining activities poses a severe environmental challenge due to its high acidity and elevated concentrations of heavy metals such as copper, lead, and zinc. Traditional containment measures often struggle to adapt to geological heterogeneity and complex hydrological conditions, reducing their long-term effectiveness. This study proposes and implements an integrated seepage control and monitoring system combining physical barriers with multi-source geophysical and tracer techniques. A 205 m-long reinforced concrete cutoff wall and dual-row grout curtains were installed to strengthen the existing clay-core dam. High-density electrical resistivity tomography (ERT) profiles and a 400 m transient electromagnetic (TEM) survey line were deployed to map subsurface resistivity distributions and identify potential seepage pathways. Rhodamine B tracer tests were conducted to verify hydraulic connectivity in critical zones. Results demonstrate that the combined barrier-and-monitoring approach reduces seepage rates by over 90% under varied hydrological conditions, significantly mitigating AMD leakage risks, while geophysical methods accurately delineate seepage channels, guiding effective remedial actions. The proposed framework offers practical guidance for AMD management and enhances the safety of tailings storage facilities.

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Research on Acidic Seepage Control and Integrated Monitoring Assessment Methods for Tailings Reservoirs in Open-Pit Copper Mines

  • 会议论文

  • 发表日期：

    2026年

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  • Aifang Du,
  • Qiong Wang,
  • Fang Wang,
  • Xiaohui Chen,
  • Lei Meng,
  • Xinyu Wu

摘要

Acid mine drainage (AMD) resulting from open-pit and underground mining activities poses a severe environmental challenge due to its high acidity and elevated concentrations of heavy metals such as copper, lead, and zinc. Traditional containment measures often struggle to adapt to geological heterogeneity and complex hydrological conditions, reducing their long-term effectiveness. This study proposes and implements an integrated seepage control and monitoring system combining physical barriers with multi-source geophysical and tracer techniques. A 205 m-long reinforced concrete cutoff wall and dual-row grout curtains were installed to strengthen the existing clay-core dam. High-density electrical resistivity tomography (ERT) profiles and a 400 m transient electromagnetic (TEM) survey line were deployed to map subsurface resistivity distributions and identify potential seepage pathways. Rhodamine B tracer tests were conducted to verify hydraulic connectivity in critical zones. Results demonstrate that the combined barrier-and-monitoring approach reduces seepage rates by over 90% under varied hydrological conditions, significantly mitigating AMD leakage risks, while geophysical methods accurately delineate seepage channels, guiding effective remedial actions. The proposed framework offers practical guidance for AMD management and enhances the safety of tailings storage facilities.