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South Africa has numerous voluminous tailings dumps that will certainly require rehabilitation. The aim of this work was to develop a methodological approach for prioritization of rehabilitation of abandoned tailings dumps. To test the applicability of the developed method in different conditions, it was applied on six abandoned tailings dumps denoted as FGMT, LMMT, KLMT, MCMT, NMMT-A and NMMT-B found in the Giyani and Musina areas of South Africa. The method involved integration of quantitative and qualitative techniques in making sound decision on the order of rehabilitation of the tailings dumps in the area. It considered the contamination potential of the dumps, the ease of their dispersion to the surroundings and the impact they have on the appearance of the natural landscape. The use of the tool on abandoned tailings dumps in the study area revealed that gold tailings dumps are to be rehabilitated first than magnesite and copper tailings dumps. The study indicated that the dump with the highest pollution potential was the FGMT and that physical stabilization was considered the most suitable rehabilitation option for abating its high toxic metals from polluting the environment. The combination of methods that improve physical stability of the dump while enhancing nutrient availability for plant growth were found appropriate for rehabilitation of MCMT. The rehabilitation of the rest of the dumps required the use of chemical methods that promote growth of vegetation. According to the study, the developed tool can be used to guide rehabilitation of abandoned tailings dumps in different settings. [ABSTRACT FROM AUTHOR]

Treatment of old mine shafts can be a tedious and costly process if not carefully planned and managed. This paper presents the work conducted with the aim of evaluating the risk of abandoned mine shafts in the Giyani and Musina areas to guide the work of their treatment. The method that allowed the ranking of physical and environmental hazards of the shafts together with their corresponding socio-economic concerns was developed and applied in this work. The results showed that the risks of falling into the shafts and the problems of ground movement were the major physical hazards and environmental stresses of the shafts. Based on the results of the study, it was concluded that in addressing the problems of abandoned mine shafts, priority should be given to mitigation strategies for the major hazards followed by those that prevent release of toxic gases and discharge of contaminated mine water by the shafts. The method used in this work is recommended for preliminary evaluation of the hazards of abandoned mines in developing countries which have many abandoned mine sites and limited resources to conduct their rehabilitation. [ABSTRACT FROM AUTHOR]