A number of laboratory batch tests were performed using natural apatite. Five different kinds of chemical compounds were selected and mixed with the apatite in order to treat mine tailings contaminated with arsenic and heavy metals. Prior to the batch experiments, basic material property tests were carried out for the mine tailings. From the laboaratory experiments, domestic apatite with 60 ~ 70% of purity would be acceptable for the economical purposes and the mixing ratio to produce the stabilizer was found to be 80% of apatite, 5% of Al₂(SO4)3 · 18H₂O, 5% of FeSO4 · 7H₂O, and 5% of MgO.