Yrite Oxidation In The Sarcheshmeh Copper Mine Tailings Dam, Kerman, Iran

This paper investigates pyrite oxidation and related environmental problems associated with the sulphide mine tailings dam produced by the copper processing plant at Sarcheshmeh mine in Kerman, Iran. The Sarcheshmeh copper mine tailings are rich in pyrite. Oxidation of pyrite-containing tails causes the well-known problem of acid mine drainage. Depending on the rate of pyrite oxidation, availability of moisture and oxygen within the tailings, the pH of the drainage is often very low. Depth sampling was conducted over the tailings materials with a spacing of 0.5 m. The samples were analysed using an AA-670 Shimadzu atomic adsorption to determine major elements and the fraction of pyrite remained within the tailings particles. The concentrations of heavy metals were determined using ICP-MS. The results show that the pyrite oxidation in tailings materials has lowered the pH of the tailings to a range varied between 2.9 and 3.5. The oxidation process caused elevated concentrations of SO4, Fe and heavy metals. The results of such investigations can be used for designing an effective environmental management program.