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<p>Soil potentially toxic element/metal contamination risks from abandoned mines and tailings require careful monitoring. This study analyzed the distribution and characteristics of potentially toxic element/metals in soil surrounding a historic copper mine and its tailings in the Tongshankou mining area, Daye, China. Results revealed that Pb, Cu, Zn, Cd, and As exhibited co-migration behavior. Most potentially toxic element/metals shared a similar distribution pattern, with higher concentrations found in the&#xa0;riverside area&#xa0;of the Oujiagang River, located&#xa0;farther&#xa0;from the mining and tailing sites. This indicates that surface runoff was likely the primary driver of potentially toxic element/metal migration. Furthermore, the study demonstrated that&#xa0;even after 20&#xa0;years and despite the implementation of comprehensive protective measures, soil potentially toxic element/metal migration still poses potential health risks, as evidenced by the Hakanson index showing at least moderate ecological risk levels at 78.16% of sampling points. Therefore, long-term monitoring of soil potentially toxic element/metal status is recommended for old or abandoned mines&#xa0;to safeguard the surrounding environment.</p>

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Investigation of Soil Potentially Toxic Element/Metal Pollution in an Abandoned Mining Area of Daye, China: Implications for the Migration and Potential Risk

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Zhi Chen,
  • Mengying Ye,
  • Yi Lian

摘要

Soil potentially toxic element/metal contamination risks from abandoned mines and tailings require careful monitoring. This study analyzed the distribution and characteristics of potentially toxic element/metals in soil surrounding a historic copper mine and its tailings in the Tongshankou mining area, Daye, China. Results revealed that Pb, Cu, Zn, Cd, and As exhibited co-migration behavior. Most potentially toxic element/metals shared a similar distribution pattern, with higher concentrations found in the riverside area of the Oujiagang River, located farther from the mining and tailing sites. This indicates that surface runoff was likely the primary driver of potentially toxic element/metal migration. Furthermore, the study demonstrated that even after 20 years and despite the implementation of comprehensive protective measures, soil potentially toxic element/metal migration still poses potential health risks, as evidenced by the Hakanson index showing at least moderate ecological risk levels at 78.16% of sampling points. Therefore, long-term monitoring of soil potentially toxic element/metal status is recommended for old or abandoned mines to safeguard the surrounding environment.