## 4 Conclusions  
In cold climates, mine reclamation is a major challenge for mining companies. Traditional methods of mine reclamation are challenging due to their remoteness, severe climatic conditions, and the effects of climate change. Tailing dumps from mining and mineral processing enterprises have a number of environmental consequences. In cases when tailings contain sulfides these include the formation of a highly mineralized acidic drainage solution, which can migrate outside the tailing dumps, leading to the pollution of surface and ground waters of the surrounding area. Interactions of water with tailings in cold climates often lead to the thawing of permafrost soils, formation of man-made taliks, and leakage of man-made waters. In the case of the development of fault zones in these areas, acidic solutions are often filtered outside the tailing dump, promoting further development of filtration channels and more intense leakage of acidic solutions. In order to prevent leakage of acidic solution from tailing dumps in time, it is necessary to determine the thawing zones and prevent the formation of filtration channels. In the case of the formation of a filtration channel, it is necessary to know the rate of rock thawing near the formed filtration channel. In this study, for the tailing dump of the concentration plant No. 14 a complete analysis of the silicate group oxides in the composition of rocks and water in the settling pond and storage pond indicates the possibility of limestone dissolution processes with Ca leaching, destruction of the carbonate matrix, and the transition of hydrocarbonate anions into solution. The water in the settling pond and storage pond is brackish, with a sulfate-chloride composition; the reaction of the medium is neutral. The rocks of the dam foundation have the potential to dissolve under chemical action from aggressive sulfate-chloride solutions (simulating the effects of process waters). In limestones, the proportion of water-soluble forms of calcium varies from 0.003 to 0.01%, in marks the range is 0.008-0.14%, and in tailings, the range is 0.013-0.017%. Mobility in aqueous solutions of magnesium is similar to calcium. The heating effect of industrial water filtering through a channel in the thawed and frozen rock of the dam base of a hydraulic structure for a 10-year period was calculated. According to the results of physical modeling, the permafrost thawing zone is located radially from the axis of the crack, along which the water is filtered. The radius of the thawing zone in frozen rocks was determined to be 1.5 m in the first year and the average amount of energy expended on thawing is 20.78 GJ per year. For thawed rock, the average amount of energy expended on heating is 0.84 GJ per year. The amount of energy transferred by the water to the frozen and thawed rock over 10 years was calculated using thermophysical modeling and was 207.8 GJ and 8.39 GJ respectively. According to the known volume of thawed rock, density and volumetric heat capaci-ty of the rock, mass fraction of the reacted rock (0.01%), and temperature rise during reac-tions calculated using thermodynamic modeling, the amount of energy received by the rock during a 10-year period as a result of rock dissolution and equilibration solutions was calculated (0.37 GJ). This is equivalent to 4.4% of the energy received by the thawed rocks due to heating from circulating water. Conceptualization, N.Y., I.F. and E.S. ; methodology, N.Y., I.F., E.S. ; software, I.F., E.S. ; validation, A.Y., S.B. ; formal analysis, N.Y.; investigation, N.Y., I.F., E.S., A.Y., S.B. ; resources, N.Y., A.Y. ; data curation, N.Y., I.F. ; writing--original draft preparation, N.Y., I.F., E.S., A.Y. ; writing--review and editing, N.Y., I.F. ; visualization, A.Y., I.F., E.S. ; supervision, N.Y., S.B. ; project administration, N.Y.; funding acquisition, N.Y. All authors have read and agreed to the published version of the manuscript.