Improving the efficiency of borehole uranium recovery in difficult mining-and-geological conditions through the development of a new technology based on the intensification of geotechnological processes of in-situ uranium leaching, the selective effect of a new chemical reagents complex on a set of the mineralogical and particle-size distribution of the orebearing rocks of the productive horizon. Methods. Sampling of core material from host rocks of the Syr Darya depression uranium deposit. The content of uranium, calcium, aluminum, iron, magnesium, and carbonate content in the samples has been revealed by the spectral analysis method. The quantitative and qualitative parameters and peculiarities of the host minerals have been determined by the method of X-ray phase analysis. By testing particle-size distribution, the fractional parameters of core samples have been determined. Specifications have been developed, as well as laboratory experiment have been conducted on uranium leaching from core material in a dynamic mode in tubes, with the addition of selected chemical reagents with different modes. Findings. The aspects of borehole uranium recovery using sulfuric acid solutions as a solvent and the reasons that cause a decrease in geotechnological parameters in ores with low filtration characteristics have been determined. An effective method has been developed for intensifying borehole uranium recovery using superficially active substance (surfactants, SAS) in difficult mining-and-geological conditions, with an increased content of argillaceous and carbonate minerals, and low filtration host rocks properties. An efficient and economically feasible method for uranium leaching with sulfuric acid solutions with the addition of surfactants has been revealed and scientifically substantiated. Originality. The scientific novelty is in the fact that the selected surfactants added to sulfuric acid solutions increases the uranium content in the productive solution and the degree of economically feasible uranium recovery with reduced sulfuric acid consumption and the ratio of liquid to solid (L:S). Practical implications. The use of rational surfactants in uranium leaching makes it possible, in areas with low filtration characteristics, to reduce operating expenses for production by reducing the period of recovery, to increase the uranium content in the productive solution and the degree of recovery, as well as to reduce the consumption of sulfuric acid and sedimentation.

Various foreign companies produce a wide range of watercontaining explosive mixtures. Gelatinized suspension and water-gel mixtures are patronized in polyethylene packaging of different diameters, various energy additives are introduced, their density and volume concentration of energy are regulated over a wide range. Kazakhstan became one of the sovereign large mining countries of the world after gaining independence in 1991. The mining industry forms the basis of industry, the economy of the country as a whole. It achieved this situation through mining mainly by the open method (more than 70 %).

The object of research is the technology of borehole uranium production with a low filtration characteristics. The purpose of the work is to increase the efficiency of borehole uranium production in complex mining and geological conditions by developing a new method based on the intensification of geotechnological processes of underground leaching of uranium, the impact of chemical reagents on the aggregate of sedimentation and mineralogical composition of ore-containing rocks of the productive horizon. At the same time, operating costs are reduced by increasing the productivity of the period of uninterrupted operation of geotechnical wells, as well as reducing the time spent working out technological blocks. Research methods include x-ray phase analysis, identification and discussion of the features, quantitative and qualitative parameters of core material and sedimentation from uranium deposits associated with the Syrdarya depression. Under laboratory conditions, the efficiency of the selected composition for the dissolution of sedimentary formations that reduce the permeability of layers was established by electron microdifraction. The applied hydrodynamic methods of well regeneration based on destruction and dispersion of sedimentation are considered and evaluated. The reagent methods used to increase the permeability of the productive horizon based on precipitation dissolution were also studied and evaluated. The results of experimental studies are analyzed and discussed, and a comparative schedule of the period of uninterrupted operation of wells is constructed. The effectiveness of the applied method for restoring the permeability of the productive horizon with the use of a complex chemical reagents. The scientific novelty lies in the fact that mineralogical studies of the core material composition indicate a complex structure of ores, in complex mining and geological conditions. The practical significance of the study lies in the high efficiency and applicability of the considered method of intensifying borehole uranium production in areas with low filtration characteristics.

The article considers the features of the distribution of technological indicators (product output, content and extraction of copper) by size classes, the main factors influencing the crushing process are identified and regression dependences of productivity on influencing factors are received. The parabolic nature of the dependences of the output of crushed rock on the size class is established. The high adequacy of the obtained models was confirmed and the most promising classes of rock size for copper extraction were determined. The obtained results and models will allow to develop a generalized model of the process of native copper mining and to implement this process with rational and optimal parameters. Also, the received models will allow to carry out an estimation of productivity of a research site of processing of raw materials of basalt quarries.

There is a description of technology by borehole uranium mining in Kazakhstan. The factors which affect for reduction of filtration characteristics in productive reservoirs are studied in detail and described an effective method for increasing borehole uranium production. The processes that occur during borehole mining of uranium with the use of sulfuric acid as solvent, as well as the conditions and reasons for reducing the productivity of geotechnical wells during their operation are considered. The results of experimental work on the intensification of borehole uranium mining in complex mining and geological conditions are analyzed and discussed, comparative graphs of the content of uranium in the productive solution, the flow rate of wells, the degree of extraction and the volume of production before and after the experiments are constructed. The results of experimental work on the efficiency of borehole uranium production, the content of uranium in PS and the productivity of wells, with predominance of the chemical type of sedimentation, are positively evaluated. The optimal parameters for the intensification of borehole uranium production in complex mining and geological conditions are recommended, and method for using complex of multi-purpose chemical reagents in combination with traditional methods of well regeneration is developed.