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Abstract <p>The presence of mine tailings in northern Mexico represents an environmental problem due to the high concentrations of potentially toxic elements, their mobilization, and their effects on public health. Bioleaching, driven by metabolic activities expressed in certain microorganisms, provides a viable alternative for recovering elements of economic interest present at low-grade. In this study, zinc bioleaching was evaluated in two mining wastes from Zacatecas, Mexico, considering the effects of temperature, and the addition of active microbial endogenous inoculum with Fe-oxidizing activity. A bioleaching efficiency of up to 86% was achieved at 30&#xa0;°C with microbial inoculation in R1 mining waste, which corresponds to a concentration of 3049&#xa0;mg/kg of Zn; and 89% with a concentration of 5028&#xa0;mg/kg of Zn in R2 mining waste at room temperature. The results highlight bioleaching as a potential strategy for revalorizing mine tailings, contributing to the reduction of its environmental impact.</p> Graphical abstract <p></p>

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Bioleaching of zinc present in abandoned mine tailings in the State of Zacatecas, Mexico

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Salomón Alvarado-Cardona,
  • Verónica Segovia Tagle,
  • Juan Armando Flores de la Torre,
  • Roberto Briones-Gallardo,
  • Victor Manuel Escot-Espinoza

摘要

Abstract

The presence of mine tailings in northern Mexico represents an environmental problem due to the high concentrations of potentially toxic elements, their mobilization, and their effects on public health. Bioleaching, driven by metabolic activities expressed in certain microorganisms, provides a viable alternative for recovering elements of economic interest present at low-grade. In this study, zinc bioleaching was evaluated in two mining wastes from Zacatecas, Mexico, considering the effects of temperature, and the addition of active microbial endogenous inoculum with Fe-oxidizing activity. A bioleaching efficiency of up to 86% was achieved at 30 °C with microbial inoculation in R1 mining waste, which corresponds to a concentration of 3049 mg/kg of Zn; and 89% with a concentration of 5028 mg/kg of Zn in R2 mining waste at room temperature. The results highlight bioleaching as a potential strategy for revalorizing mine tailings, contributing to the reduction of its environmental impact.

Graphical abstract