Microbial diversity at the moderate acidic stage in three different sulfidic mine tailings dumps generating acid mine drainage |
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| Affiliation: | 1. Department of Mining Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Mineral Bioprocessing Research Group (MBRG), Biotechnology and Bioengineering Research Institute, Isfahan University of Technology, Isfahan 84156-83111, Iran;1. Department of Geology and Geography, West Virginia University, Morgantown, WV 26506-6300, USA;2. Department of Geology and Geophysics, Global Change and Sustainability Center, University of Utah, Salt Lake City, UT 84112, USA;1. School of Biomedical Sciences, Curtin University, Perth 6845, Australia;2. Centre for Bioprocess Engineering Research (CeBER), Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa;3. Commonwealth Scientific and Industrial Research Organisation (CSIRO), Land and Water Flagship, Floreat, WA 6014, Australia |
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| Abstract: | ![]()
In freshly deposited sulfidic mine tailings the pH is alkaline or circumneutral. Due to pyrite or pyrrhotite oxidation the pH is dropping over time to pH values <3 at which acidophilic iron- and sulfur-oxidizing prokaryotes prevail and accelerate the oxidation processes, well described for several mine waste sites. The microbial communities at the moderate acidic stage in mine tailings are only scarcely studied. Here we investigated the microbial diversity via 16S rRNA gene sequence analysis in eight samples (pH range 3.2–6.5) from three different sulfidic mine tailings dumps in Botswana, Germany and Sweden. In total 701 partial 16S rRNA gene sequences revealed a divergent microbial community between the three sites and at different tailings depths. Proteobacteria and Firmicutes were overall the most abundant phyla in the clone libraries. Acidobacteria, Actinobacteria, Bacteroidetes, and Nitrospira occurred less frequently. The found microbial communities were completely different to microbial communities in tailings at
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| Keywords: | Mine tailings Pyrite oxidation Acidophiles Microbial diversity |
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