Comparative study of two biggest mineral wastes in South Africa for mine reclamation: A geotechnical study

摘要

Laboratory investigations were conducted on two mineral wastes to assess their geotechnical properties for mine backfilling. Coal Fly Ash (CFA) sludge recovered from CFA and acid mine drainage (AMD) reaction (ratios 1:2 and 1:3) and gold mine tailings (GMT) with 3 % cement were evaluated at varying curing ages. Both samples showed favourable characteristics for use in mine reclamation. However, solid/liquid ratios should be maintained to ensure maximum strength. The results show that CFA is recommended for mine reclamation due to its geotechnical properties. The use of GMT is possible, however blending with higher percentages of cement should be considered.