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ENVIRONMENTAL MINERALOGY OF SOILS AROUND SELEBI PHIKWE NICKEL-COPPER PLANT, BOTSWANA

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This study determined mineralogical changes in soils as a result of mining and smelting of nickel-copper (Ni-Cu). Soil samples obtained around the Selebi Phikwe Ni-Cu plant, Botswana were studied using petrographic microscopy and X-ray Powder Diffraction (XRPD) technique. Bulk soil samples contained actinolite, albite, quartz, microcline, pyrrhotite, silicon sulfide and cobalt oxide, whereas the <2 m fraction was made of kaolinite, illite, smectite, anorthite and quartz. Heavy minerals fraction of soil samples ranged between 5 wt% and 43 wt% with higher values occurring at sites close to either the mines or the smelter plant. Cobalt oxide and silicon sulfide identified in surface soils are indicative of mineralogical alteration of mining waste deposited on soils. Consequently, aspects of pollution management such as phytoremediation and phytomining, and environmental desulfurization could be introduced as pollution control measures at Selebi Phikwe.
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Keywords: Botswana; Environment; Mineralogy; Selebi Phikwe; Soils; X-ray powder diffraction

Document Type: Research Article

Affiliations: 1: Department of Geology, University of Botswana, P/Bag 0022 Gaborone Botswana 2: VDH Industrial Hygiene CC.PO. Box 26792 Langenhoven Park, 9330, Free State, South Africa 3: Department of Environmental Health, Technikon Free State, P/Bag X20539 Bloemfontein, Free State, South Africa 4: Department of Environmental Science, University of Botswana, P/Bag 0022 Gaborone, Botswana

Publication date: 01 June 2003

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