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A laboratory study of covers made of low-sulphide tailings to prevent acid mine drainage

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Environmental Geology

Abstract

Covers with capillary barrier effects (CCBE) are considered to be one of the most effective ways to control acid mine drainage (AMD) production from mine wastes. The use of low-sulphide tailings in CCBE has been proposed recently for cases where other types of material may be unavailable near the mining site. This paper presents leaching column test results showing that CCBEs with a moisture-retaining layer made of slightly reactive tailings, with three different sulphide contents, can effectively limit the production of AMD from the acid-generating tailings placed underneath. With these layered covers, the leachate pH was maintained near neutrality throughout the testing period. When compared to uncovered tailings, the efficiency of the cover systems for reducing the amount of contaminants in the percolated water was determined to be greater than 99% for zinc, copper and iron. This study shows that the use of low-sulphide tailings can improve the ability of a CCBE to limit gas diffusion by consuming a fraction of the migrating oxygen.

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Acknowledgements

This work was financed through the MEND/NEDEM program, and included a contribution from the Canadian Federal Government (CANMET) and from the Quebec Provincial Government (MRNQ). The CRDAT (Conseil Régional de Développement en Abitibi-Témiscamingue) also contributed to this research project. The authors would like to thank Stéphane Servant, Nil Gaudet, Darcy Jolette and Serge Poirier for their help with the laboratory program, Phil Tibble for technical assistance to initiate the oxygen-consumption measurements, and Mathieu Villeneuve for his assistance with Visual MINTEQ. Finally, the authors thankfully acknowledge the financial support of the participants to the industrial NSERC Polytechnique-UQAT Chair on Environment and Mine Waste Management (http://www.enviro-geremi.polymtl.ca).

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Bussière, B., Benzaazoua, M., Aubertin, M. et al. A laboratory study of covers made of low-sulphide tailings to prevent acid mine drainage. Env Geol 45, 609–622 (2004). https://doi.org/10.1007/s00254-003-0919-6

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  • DOI: https://doi.org/10.1007/s00254-003-0919-6

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