Quantification of oxygen consumption and sulphate release rates for waste rock piles using kinetic cells: Cluff lake uranium mine,northern Saskatchewan,Canada |
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| Institution: | 1. Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N 5E2;2. Department of Earth Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1;1. Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Temixco, Morelos 62580, Mexico;2. Facultad de Ciencias de la Tierra, Universidad Autónoma de Nuevo León, Linares, N.L. 67700, Mexico;3. Geochemistry Division, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500007, India;4. Department of Earth Science, School of Physical, Chemical & Applied Sciences, Pondicherry University, Kalapet, Puducherry 605014, India;1. Centre d’études en ressources minerals (CERM), Université du Québec à Chicoutimi (UQAC), 555 boul. de l’Université, Chicoutimi, Québec, Canada G7H 2B1;2. Department of Geology, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, Canada P7B 5E1;1. Institute of Marine Sciences and Management, Istanbul University, Istanbul, Turkey;2. Moda Hüseyin Bey Sokak, Istanbul, Turkey;3. Dept. of Molecular Biology and Genetics, Haliç University, Istanbul, Turkey;1. Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, SK S7N 5E2, Canada;2. Cameco Corporation, 2121 – 11th Street West, Saskatoon, SK S7M 1J3, Canada;1. Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, SK S7N 5E2, Canada;2. Department of Geological Sciences and Geological Engineering, Queen’s University, 36 Union St, Kingston, ON K7L 3N6, Canada;3. Department of Geology, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada |
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| Abstract: | Oxidation rates of low sulphide (<0.5 wt.%) gneissic waste rock from the Cluff lake U mine, northern Saskatchewan, Canada were determined using 3 independent methods: O2 consumption rates in kinetic cells, SO4 measurements of kinetic cell effluent and humidity cell SO4 release rates. The O2 consumption measurements demonstrated that the oxidation of pyrite was strongly dependent on grain size and moderately dependent on water content, temperature and microbiology. Oxygen consumption rates were highest at water contents of 5–10 wt.% (12–25% saturation). Measured SO4 release rates (3.1–91 mg SO4 kg?1 wk?1) for the kinetic cells were comparable to rates calculated from the O2 consumption values (6.9–70 mg SO4 kg?1 wk?1). Sulphate release rates determined from humidity cells were generally higher than those obtained from the kinetic cells, ranging from 6 to 64 mg SO4 kg?1 wk?1 for the coarsest and finest fraction, respectively. These differences were attributed to sample heterogeneity. |
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