The article presents the results of a comprehensive environmental impact assessment in the extraction of tin from stale tails accumulated in tailings during the operation of the Khingan deposit. Tailings pose a threat to the environment and at the same time are a source of technogenic raw materials. Operation of a pilot plant of gravity-flotation type will have a negligible impact on the environment, and a low positive effect on the socio-economic sphere. At the same time, the environmental situation will significantly improve in connection with the liquidation of tailings.