Post-mining land has unfavorable soil properties for plant growth, such as low available nitrogen (N),  which inhibits plant growth. The study aimed to examine the effect of application of coal fly ash (CFA), dolomite, and empty fruit bunches of oil palm (EFBOP) on the available N contents in post-mining soil. The study employed a nested design, in which the amounts of EFBOP was nested in coal fly ash or dolomite. The amount of coal fly ash applied was 100 tons ha^-1 and the amount of dolomite was 15 tons ha^-1, while the rates of EFBOP application were 0, 15, 30, and 45 tons ha^-1. The mixtures of CFA and EFBOP or dolomite and EFBOP were added homogenously to post-mining soils in the laboratory, and then the mixtures were incubated at 70% of field capacity of water content for 30 days.  Observations of several soil chemical properties after the incubation period were completed showed that the application of EFBOP and CFA or EFBOP and dolomite increased the contents of N-NH₄⁺ and N-NO₃^- in soils.  Soil pH and exchangeable Al decreased with the application of EFBOP and CFA or EFBOP and dolomite, in which increasing the amount of applied EFBOP resulted in decreases in soil pH. The results obtained in this study highlight the potential of EFBOP and CFA as soil amendment materials in post-mining lands.