Acid mine drainage (AMD) from coal mining has caused serious environmental degradation worldwide. The resultant sulphuric acid and low pH of the drained water accelerate rock, soil and sediment solubility, enhancing metal and metalloid leaching into the natural environment. AMD assessment is achieved using static or kinetic methods. The former is based on acid-base accounting whilst the latter incorporates the dynamics of the actual AMD generation process by focusing on weathering rates and, leachate ion abundance. In this study, static and kinetic testing is used to characterise the AMD and the potential acid generation threat of the discard material extracted from the Indumeni Discard Dump site (IDDS) located in the Klip River Coalfields of South Africa. Coal discard material was analysed for mineralogy, metal composition, physicochemical character and acid generation potential using acid-base accounting methods (static testing) and kinetic humidity leach column tests (22-week duration). Results demonstrate that all of the discarded material has positive acid-producing potential (+NAPP) ranging from 19.28 KgH2SO4 in the northern part of the dump to 92.13 KgH2SO4 near the centre and 82.19 KgH2SO4 at the base and, the site is geochemically classified as potentially acid-forming (PAF). Data from the chemical analysis (11 elements) was used to generate analyte production rates and to assess the acid generation and neutralizing characteristics. The low carbonate production coupled with high sulphate confirms the potentially acid forming character of the discard coal. Low organic carbon content points to possible long periods of leaching. XRF analysis identified the highest concentrations measured in Ba (453.17ppm), Sr (360.80ppm) and Zr (127.08ppm); high concentrations of V and Ce (30 – 99 ppm) and moderate amounts (20 – 30 ppm) of Cr, Cu, Y and La. Leaching of these metals are likely to move to subsurface water as only a few were detected in surrounding surface water.