In this study, the stabilization treatment efficiency of coal mine drainage sludge (CMDS), waste cow bone (WCB) and waste oyster shell (WOS), which mainly contain α-FeOOH and CaCO 3 , C 10 (PO 4 ) 6 (OH) 2 and CaO, respectively, was estimated for ordinary and paddy fields contaminated with arsenic, lead and other heavy metals. After mixing the contaminated soils completely with stabilization materials, the samples were preserved with moisture for 28 days. The extraction of As, Pb, Cu, Zn and Cd

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... for ordinary soils stabilized by CMDS(wt. 15%) and WOS(wt. 5%) were 5.1, 0.12, 0.33, 2.28 and 0.25 mg/kg, respectively, satisfying the concerned limit for 'Ga' region established by the Ministry of Environment at 2009. The extracted arsenic concentrations of paddy soils stabilized by CMDS(wt. 20%), CMDS(wt. 10%)/WOS(wt. 5%), CMDS(wt. 15%)/WOS(wt. 5%), and CMDS(wt. 10%)/WOS(wt. 10%) were 1.6, 3.52, 2.2 and 2.42 mg/kg, respectively. These results also satisfied the concerned limit for 'Ga' region.