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In this article, methods of reducing landslide phenomena and collapse of career of slopes, in the extraction of minerals with the open-pit mining approach are set out. The ways of uncovering upper argillaceous acclivities with the creation of buttresses made from rocky minerals are suggested. Also, technological frameworks of the establishment of acclivities of benches in primary resources, with preliminary conduct of the research on the deformation of the minerals from the drilling-andblasting activities are offered. On the basis of the dynamic processes of blasting and resistance of the massif to the breakage, there is a formula offered, for determining the rate of fracturing, and the methodology of calculation of the specific charge of the blasting substance, including and excluding the fracturing of the massif is substantiated. The technique of defining the parameters of buttresses, used in strengthening of the acclivities, piled with unstable argillaceous and friable minerals, is also suggested.

Purpose. Substantiating the main explosive impulse parameters and determining the dependences of metal recovery during forced loosening and shaking of the ore mass by an electro-hydraulic blasting to intensify the heap leaching process. Methods. The experimental laboratory studies have revealed the dependences of the discharge energy influence on the blasting pressure at various parameters of the discharge capacity and inductance, as well as the change in the metal content in the productive solution when the ore mass is exposed to an electro-hydraulic blasting. Findings. A research methodology using the models of the electro-hydraulic blasting impact on the ore mass is proposed. In addition, the similarity criteria have been substantiated, which make it possible to study the nature of shaking and loosening under various loading parameters. It has been determined that using the method of influencing the ore mass with an electric discharge in a liquid increases the degree of metal recovery from the ore during heap leaching and increases the rate of the solution penetration into the depth of the ore mass. When using the method of loosening the ore mass by artificial shaking, the recovery of copper increases by 10-15% and the leaching time decreases by 1.5 times. Originality. It has been determined that due to the possibility of regulating the electric discharge capacity in the required range during blasting operations, loosening and additional crushing of the ore mass occurs; fractures are formed in lumpy ores, which contribute to an increase in the rate of leaching solution infiltration. Practical implications. The proposed technology makes it possible, without dismantling the equipment and irrigation communications, to perform additional loosening of the ore mass and increase the rate of the leaching process, as well as significantly reduce the time of the technological process.

Purpose. Development of a methodology for determining the level of actual losses and dilution of ore based on the identified patterns of the influence of occurring ore body elements and the stope parameters when mining thin slope deposits using a system for delivering ore by the blasting force. Methods. The task set is solved using an integrated approach, including the analysis of literary sources and the existing practical experience on the issues of losses and dilution, conducting experimental-industrial experiments in the conditions of the Akbakai deposit to assess the recommended method effectiveness for determining the values of excess losses and dilution of ore, geomechanical assessment of the mass using the methods of limit equilibrium, numerical and probabilistic analyses. Findings. A methodology for determining losses and dilution when mining thin slope deposits using a system for delivering ore by the blasting force is proposed, which makes it possible to predict excess losses and dilution coefficients arising from stope roof caving and incomplete ore delivery. The actual losses and dilution of ores in the Akbakai deposit have been determined based on the proposed methodology and instrumental surveys. The developed methodology for determining the values of excess losses and dilution makes it possible to take preliminary measures to prevent the stope roof caving with the complete ore mass delivery using the blasting force. Originality. New dependences have been revealed for the conditions of the Akbakai deposit: logarithmic – the value of dilution depending on the angle of the ore body occurrence; polynomial – the stope maximum span depending on the ore body dip angle; exponential – ore losses depending on the angle of the ore body occurrence. Practical implications. The practical significance, confirmed in the course of pilot-experimental work, is in minimizing the percentage of loss and dilution of the useful component when mining thin slope ore deposits using a sublevel blast-hole stoping system with an open stope space, which makes it possible to reduce the cost of the produced mineral.

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