Reagent  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...

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