AbstractReagent grade of calcium and magnesium hydroxides were used in this study to treat acid mine drainage (AMD)sample. AMD sample was collected from a tin tailing pond that located in Pengkalan Hulu, Perakwhich as pHaround 2.87± 0.01. pH values had increased after treated with calcium hydroxide (Ca(OH)2) and magnesium hydroxide (Mg(OH)2), respectively. The maximum pHvalues obtained was 11.35± 0.01by using 1.0 g of Ca(OH)2at interval time 5 min. ForMg(OH)2, the highest pHvalue can be obtainedwas 7.22 ± 0.01 by using 1.0 g at interval time 30 min. The concentration of heavy metals such as aluminum, copper, iron, manganese, nickel and zinc were reduced after reaction withboth materials.For examplesaluminum concentration was reduced from 110.33 mg/L to 2.80 mg/L and 0.01 mg/L by using 1.0 g of Ca(OH)2and Mg(OH)2, respectively...