The mining industry uses large volumes of water. A large part of the water used in the mining process becomes wastewater. Mine wastewater contains high amount of pollutants. Major pollution occurs in the receiving environment as a result of the mining wastewater being discharged to the receiving environment without being treated. It is very important to treat mine wastewater in order to prevent environmental pollution and to make mining processing facilities sustainable. In the study, the treatment of heavy metal as Al, Mn, Fe, Zn, Ba and Sb, Ca+2 and Mg+2 cations and SO4 from the wastewater of a mining processing plant in the Black Sea region by chemical precipitation (CP) method used Ca(OH)2 was investigated. The effects of mixing speed and precipitant amount on removal efficiency were investigated. It was seen that 100 rpm as fast mixing speed and 15 rpm as slow mixing speed were suitable. At these values, it was determined that the heavy metal concentration was removed from the environment with high removal efficiencies, and the removal of Ca and Mg ions remained at a low level. Although the increase in the amount of Ca(OH)2 did not affect the heavy metals with high removal efficiency, it caused a slight increase in the heavy metals with lower removal efficiency. While the increase in Ca(OH)2 amount increased the removal efficiency of Mg and sulfate ions, it decreased the removal efficiency of Ca ion. The results showed that while the CP method was suitable for heavy metal removal from mine wastewater with a success rate of approximately 99.9%, an appropriate advanced treatment process should be used after CP, since the hardness removal was approximately 40% and the sulfate removal was approximately 32%.