A mineralogical approach to evaluating laboratory scale acid rock drainage characterisation tests |
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| Affiliation: | 1. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada;2. Department of Earth Sciences, Carleton University, Ottawa, ON, Canada;3. Department of Geological Sciences, University of Idaho, Moscow, ID, United States;4. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada;5. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada;1. Laboratory of Mineral Processing and Resources Recycling, Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan;2. Laboratory of Mineral Processing and Resources Recycling, Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan;1. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada;2. Department of Earth Sciences, Carleton University, Ottawa, ON, Canada;3. Department of Geological Sciences, University of Idaho, Moscow, ID, United States;4. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada;5. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada;1. Buka Environmental, 941 8th Street, Boulder, CO 80302, USA;2. U.S. Geological Survey, 3215 Marine St., Boulder, CO 80303, USA |
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| Abstract: | Effective management of the risks associated with acid rock drainage (ARD) requires the ability to identify material with a potential to generate ARD reliably. With the increasing prevalence of quantitative mineralogy (Quantitative XRD, auto-SEM), opportunity exists to use mineralogy at all stages in ARD characterisation and prediction. This study uses a mineralogical approach across the head grade samples and the residues obtained under leach conditions of several common ARD characterisation tests (Acid Neutralising Capacity, Net Acid Generation), as well as the University of Cape Town (UCT) biokinetic test to evaluate the extent to which acid-neutralising minerals react. The results show the contribution of the carbonates to the acid neutralising capacity, as well as the partial dissolution of intermediate weathering silicate minerals such as chlorite and mica. |
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| Keywords: | Acid rock drainage Mineralogy |
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