Heavy metal-contg. mine water was preliminarily purified by sedimentation and filtration and then treated with Ca(OH)(2) (200-230 mg/dm(3)) under addn. of small amts. of KOH and NaOH (7.25-32 g/m(3) each) for 120 min. The process was studied according to the factorial experiment conditions. The sediments were analyzed for Mg, Zn, Pb, Cd, and Fe as well as Ca , K, and Na ions by at emission spectroscopy with inductively coupled plasma and for grain size distribution. The optimum amts. of Ca(OH),, KOH and NaOH were 200, 15 and 15 g/m(3), resp. The treatment resulted in a de crease in the Zn content from 28 down to 1.0 mg/dm(3) , Pb content from 0.041 down to 0.012 mg/dm(3) Cd content from 0.019 down to below 0.005 mg/dm(3) and Fe content from 1.6 down to 0.23 mg/dm(3).