The paper analyzes the results of metal extraction from tailings of ore processing based on traditional approaches. The history of methods of secondary processing of mineral raw materials is described. The technique and features of mechanochemical activation of the leaching process of metal ores and coals are described. The results of laboratory studies of a new mechanochemical technology for metal extraction are presented. A description of the compromise optimal criterion formulated in the model of extraction of metals from tailings with substandard mineral raw materials based on the mathematical planning of the experiment, regression analysis methods and consideration of sanitary standards for the disposal of processing tailings is proposed. Mechanochemical technology results in economic and environmental effects from the utilization of processing tailings and radical strengthening of the mineral resource base of the mining industry.

Relevance. The fact that hydrogenic deposits are developed using combined technologies, and the criteria for combining technologies have not been sufficiently developed. Aim. To select the optimal method of deposit development, taking into account the characteristics of the uranium ores composing it. Objects. The Semizbai sandstone deposit, which lies in loose sedimentary rocks, is localized within a 36 km long section with a width of 10 km. Methods. Analysis of the theory and practice of field development, finding dependencies between operational indicators, modeling, methods of mathematical statistics, technical and economic calculations and approbation of some provisions. Results. The authors have given characteristic of systems for developing hydrogenic deposits and substantiated the necessity of combining metal extraction technologies by leaching with traditional technologies in the conditions of the deposit. Alternative technologies for metal leaching using interacting wells and with metal leaching in a pile are detailed. The mechanism and differences in the conditions of uranium leaching in a quicksand array and in a heap was clarified. The authors have carried out comparative characteristic of alternative options for field development, indicating, among other things, their advantages and disadvantages. It was determined that leaching parameters depend on speed and efficiency of opening new reaction areas with a different mechanism for removing uranium from mineral particles. It is proved that the efficiency of the development of hydrogenic deposits is increased by combining the processes of borehole hydro extraction of ores and heap leaching of metals. The authors proposed the model of decision-making sequence with an arbitrary source of information based on the criterion of discounted profit from mining. Conclusions. The results of the study may be in demand when revaluing reserves, modernizing systems for the development and optimization of methods for managing the quality of mining products. The recommended methods of monitoring the combined development of hydrogenic deposits contribute to increasing the completeness of subsurface use.