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Geochemical fractionation of metals and metalloids in tailings and appraisal of environmental pollution in the abandoned Musina Copper Mine, South Africa

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Abstract

The economic benefits of mining industry have often overshadowed the serious challenges posed to the environments through huge volume of tailings generated and disposed in tailings dumps. Some of these challenges include the surface and groundwater contamination, dust, and inability to utilize the land for developmental purposes. The abandoned copper mine tailings in Musina (Limpopo province, South Africa) was investigated for particle size distribution, mineralogy, physicochemical properties using arrays of granulometric, X-ray diffraction, and X-ray fluorescence analyses. A modified Community Bureau of Reference (BCR) sequential chemical extraction method followed by inductively coupled plasma mass spectrometry/atomic emission spectrometry (ICP-MS/AES) technique was employed to assess bioavailability of metals. Principal component analysis was performed on the sequential extraction data to reveal different loadings and mobilities of metals in samples collected at various depths. The pH ranged between 7.5 and 8.5 (average ≈ 8.0) indicating alkaline medium. Samples composed mostly of poorly grated sands (i.e. 50% fine sand) with an average permeability of about 387.6 m/s. Samples have SiO2/Al2O3 and Na2O/(Al2O3 + SiO2) ratios and low plastic index (i.e. PI ≈ 2.79) suggesting non-plastic and very low dry strength. Major minerals were comprised of quartz, epidote, and chlorite while the order of relative abundance of minerals in minor quantities is plagioclase > muscovite > hornblende > calcite > haematite. The largest percentage of elements such as As, Cd and Cr was strongly bound to less extractable fractions. Results showed high concentration and easily extractable Cu in the Musina Copper Mine tailings, which indicates bioavailability and poses environmental risk and potential health risk of human exposure. Principal component analysis revealed Fe-oxide/hydroxides, carbonate and clay components, and copper ore process are controlling the elements distribution.

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Acknowledgements

The authors would want to acknowledge the support from ESKOM Foundation, NRF, and THRIP for funding this study through student bursaries and consumables.

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Authors and Affiliations

  1. Environmental Remediation and Water Pollution Chemistry Group, Department of Ecology and Resource Management, University of Venda, Private Bag x 5050, Thohoyandou, 0950, South Africa

    M. W. Gitari, S. A. Akinyemi, L. Ramugondo & M. Matidza

  2. Mining and Environmental Geology, School of Environmental Sciences, University of Venda, Thohoyandou, South Africa

    S. E. Mhlongo

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  1. M. W. Gitari
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  2. S. A. Akinyemi
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  3. L. Ramugondo
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Correspondence to M. W. Gitari.

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Gitari, M.W., Akinyemi, S.A., Ramugondo, L. et al. Geochemical fractionation of metals and metalloids in tailings and appraisal of environmental pollution in the abandoned Musina Copper Mine, South Africa. Environ Geochem Health 40, 2421–2439 (2018). https://doi.org/10.1007/s10653-018-0109-9

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