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Mine Waste Rock: Insights for Sustainable Hydrogeochemical Management

Abstract : Mismanagement of mine waste rock can mobilize acidity, metal (loid)s, and other contaminants, and thereby negatively affect downstream environments. Hence, strategic long-term planning is required to prevent and mitigate deleterious environmental impacts. Technical frameworks to support waste-rock management have existed for decades and typically combine static and kinetic testing, field-scale experiments, and sometimes reactive-transport models. Yet, the design and implementation of robust long-term solutions remains challenging to date, due to site-specificity in the generated waste rock and local weathering conditions, physicochemical heterogeneity in large-scale systems, and the intricate coupling between chemical kinetics and mass- and heat-transfer processes. This work reviews recent advances in our understanding of the hydrogeochemical behavior of mine waste rock, including improved laboratory testing procedures, innovative analytical techniques, multi-scale field investigations, and reactive-transport modeling. Remaining knowledge-gaps pertaining to the processes involved in mine waste weathering and their parameterization are identified. Practical and sustainable waste-rock management decisions can to a large extent be informed by evidence-based simplification of complex waste-rock systems and through targeted quantification of a limited number of physicochemical parameters. Future research on the key (bio)geochemical processes and transport dynamics in waste-rock piles is essential to further optimize management and minimize potential negative environmental impacts.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-02917748
Contributeur : Nicolas Seigneur <>
Soumis le : mercredi 19 août 2020 - 18:00:04
Dernière modification le : jeudi 24 septembre 2020 - 16:34:27

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Bas Vriens, Benoît Plante, Nicolas Seigneur, Heather Jamieson. Mine Waste Rock: Insights for Sustainable Hydrogeochemical Management. Minerals, MDPI, 2020, 10 (9), pp.728. ⟨10.3390/min10090728⟩. ⟨hal-02917748⟩

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