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Study on environmental influence of heavy metals in downstream farmland soil of a gold-copper mine tailings pond that has been out of service
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Published:   2026-07-06
Publication Date:   2026-07-06
Online:   2026-07-06
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Abstract:

Elevated heavy metal concentrations exist in decommissioned gold-copper tailings ponds and may migrate, posing a potential risk to the downstream farmland soil environment. This study focuses on the heavy metal contamination extent and degree in farmland downstream of a decommissioned gold-copper tailings pond. Strata lithological distribution and groundwater flow direction in the study area are determined via drilling exploration. Heavy metal concentrations in surface soil samples, collected from the tailings pond and downstream farmland within a 2 km radius, are analyzed. Results show that several heavy metal concentrations in tailings pond soil significantly exceed the agricultural land soil environmental pollution risk screening values, with a Nemerow composite pollution index of 5.10, and the site is classified as severely polluted. In contrast, both single-factor and comprehensive multi-factor pollution indices of nine targeted heavy metals in surface soils from downstream farmland within 1 km are categorized as "clean." No discernible spatial trends or correlations of heavy metal concentrations are observed along the valley of the study area. Mild pollution caused by Cu is detected in soils 2 km downstream of the tailings pond. Based on the assessment of upstream topography, groundwater conditions and heavy metal distribution patterns, the potential of Cu migration from upstream soil or groundwater to this exceedance site is considered low. Strengthened environmental management and further identification of pollution sources are required in this local contaminated area. This study suggests that with proper closure management after decommissioning—including leachate collection systems and improved drainage systems—the risk of heavy metal contamination to downstream farmland soils from this gold-copper tailings pond is relatively low.

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Basic Information:

China Classification Code:X753;X825

Citation Information:

[1]SUN Fengrui,YU Zhengmao,ZHANG Wenguo ,et al.Study on environmental influence of heavy metals in downstream farmland soil of a gold-copper mine tailings pond that has been out of service[J].Journal of Nantong University (Natural Science Edition)().

Fund Information:

江苏省省级财政(地质找矿)专项资金资助项目(HDYS-DZ002(2021))

Published:  

2026-07-06

Publication Date:  

2026-07-06

Online:  

2026-07-06

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