Geochemical processes in mill tailings deposits: modelling of groundwater composition |
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| Institution: | 1. Ceramics and Biomaterials Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam;2. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam;3. Hanoi National University of Education, 136 Xuan Thuy, Cau Giay District, Hanoi, Vietnam;1. 2;2. GeoBioTec, Univ. Aveiro, 3810-193 Aveiro, Portugal;3. Dep. de Geociências, Univ. de Aveiro, 3810-193 Aveiro, Portugal;4. Instituto Dom Luiz and Dep. de Geologia, Faculdade de Ciências, Univ. Lisboa, 1749-016 Lisboa, Portugal;1. Tomsk Polytechnic University, Russia;2. James Hutton Institute, Scotland, UK;3. University of Aberdeen, Scotland, UK;4. Mayskoe Gold Mining Company LLC, Russia;5. JSC TomskNIPIneft, Tomsk, Russia;6. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia |
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| Abstract: | A general model is presented for geochemical processes occurring in the unsaturated zone of a carbonate-depleted, pyritic tailings deposit. Quantification of slow geochemical reactions, using published, empirical rate laws from small-scale experiments on monomineralic samples, and geochemical equilibrium reactions successfully reproduced the relative rates of field processes in the case study, Impoundment 1 in Kristineberg. Reproduction of absolute rates was achieved by scaling down all laboratory-derived mineral weathering rates by two orders of magnitude. The sensitivity of the modelled groundwater composition and pH to rates of pH-buffering processes and redox reactions indicated that inclusion and accurate quantification of all dominant geochemical processes on the field scale is necessary for reliable prediction of groundwater composition and pH. |
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