Contaminant leaching from gold mining tailings dams in the Witwatersrand Basin, South Africa: A new geochemical modelling approach
作者： Robert N. Hansen
DOI: 10.1016/J.APGEOCHEM.2015.06.001
关键词:
摘要: Abstract In this study a new geochemical reaction modelling methodology is used to shed light on the processes within Witwatersrand tailings impoundments and evaluation of impacts for future mining projects evaluated. Information from international local studies sulphidic develop conceptual understanding typical gold impoundment. The consist 3 distinct zones: Oxidation Zone (OZ), Transition (TZ) Reduction (RZ). Individual models are developed each zones. output one model as an input next in spatial order. results final represent basal seepage characteristics, which indicate most likely groundwater resources. agree with existing information AMD Witwatersrand. that be acidic (pH ∼3.5), containing elevated concentrations SO4 trace metals (Al, Co, Cr, Cu, Mn, Ni, Zn U). Predicted Fe low, due low f O 2 TZ RZ buffering effect precipitation K-jarosite OZ TZ. This therefore indicates employed produces can correlated thus assessments material projects.
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