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Sulfide-bearing mine tailings of the Darasun ore processing plant situated in the permafrost zone in Trans Baikal region (Russia) were examined in 2016. The composition of mine drainages and affected river waters were investigated. The processes of oxidation and chemical weathering of mine tailings leads to removal of a wide spectrum of chemical elements according to geochemical analyses. Two associations of chemical elements were found: i) Tl, Pb, Cd, Zn, Mn, and Be; ii) Cu, Mo, Au, Ag, As, and Sb. Thallium is pr...