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M i n i n g

M i n i n g

Purpose. The present paper aims to develop methodological principles for the selection of effective parameters of resource-saving technologies while developing water-bearing titanium-zirconium deposits basing on the complex of analytical studies. Methods. The paper applies a complex of research methods: analytical – to analyze and generalize the main differences of the development technology for water-bearing placer deposits and problem statement; technical-economic analysis for identifying the effect of a resource-saving technology on the indices of land use of the open-pit mining and involvement of associate raw materials in the economic activity; forecasting – to determine the influence on complex development of a titanium-zirconium deposit on the operating parameters of the regional nonmetallic raw material open pits. Findings. Effective trends in using the associate raw materials located in the enclosing and overburden rocks of a titanium-zirconium deposit are identified. Key differences between the technologies of associate raw material mining from the overburden rocks and their recovery from the enclosing rocks while mineral mining are defined. Predictive influence of a resource-saving technology of the development of titanium-zirconium deposits on the extraction of building materials from the regional nonmetallic open pits is specified. Volumes of possible associate raw material mining while developing the Motronivskyi GZK open pit during its operation are determined. Originality. New dependences of a land capacity coefficient while mining nonmetallic raw material in the region, prime cost of ore development as well as number of open pits for sand and clay production in the region on the volumes of involved associate raw material of the titanium-zirconium open pits are identified. Practical implications. A structural-logical scheme is elaborated for the selection of a resource-saving technology while operating open pits for the development of titanium-zirconium deposits.

Purpose. To substantiate a rational schedule for the combined dragline-truck operation taking into consideration a coefficient of mining in the context of the pit. Methodology. Mathematical and graphical modeling was involved while determining a coefficient of mining concentration in the pit as well as feasibility analysis to select a rational procedure scheme for dragline operation. Findings. Recommendations for the selection of rational dragline operation, while truck loading in the context of Motronivsko-Annivskyi pit, have been developed taking into consideration mining concentration degree in the pit. It has been determined that bottom dragline unloading into a truck, located in the central part of bench mining width, as well as the dragline position at 0.5 A distance from the bench crest, is the most efficient plan of action for the conditions. Technological scheme to develop Motronivsko-Annivskyi pit has been proposed. Originality. Dependence of the mining concentration in the pit upon the parameters of development system elements according to different technological schemes has been derived. The dependence helps estimate development cost for overburden rocks using draglines with direct unloading into trucks. Practical value. Technological schemes for the combined dragline dump truck operation have been developed. Their use makes it possible to cut the prime cost of overburden activities. Implementation of the proposed solutions helps cut stripping cost by UAH 79.65 million a year if annual overburden volume is Qrozkryvu - Qstripping = 13.5 million m3/year.

The research aims to increase the performance efficiency of hydromechanization equipment under the conditions of pit operation of the Motronivskyi Mining and Concentrating Plant by determining the dynamics of change in the water level in the mine workings when developing the overburden rocks and mineral. It has been generalized the world experience of determining the groundwater inflows into mine workings, which are mined by means of hydromechanization equipment. The methods have been developed for calculating the underground water inflow into the pit reservoir, when mining the placer ores by hydromechanization equipment. It has been proved that the dredger work in the conditions of the Motronivskyi MCP pit is possible without external source of water supply. The research results in determining the influence of underwater mining of overburden rocks and ore by dredger for decreasing the water level and its subsequent recovery in the reservoir of the Motronivskyi MCP pit, allow to develop a mode of mining operations without an external source of water supply. The dynamics of water level fluctuations in mine working during the working week have been established. The research results have shown that the dredger, taking into account the technical characteristics, can continuously operate for 9.5 days under the conditions of underground water inflow into the Motronivskyi MPP pit. It has also been established that after the dredging of the overburden rocks is stopped, the level of water in the pit for 2.5 days will recover.

This article is devoted to the conceptual development of the transition from drill and blast excavation to a non-blasting method for the preparation of hard rock before excavation at construction material deposits. The scientifi c and technical literature on the problems in the blasting of hard rock in preparation for excavation is analysed. A classifi cation of mining equipment for the non-blasting development of a rock mass for excavation has been developed, taking into account the nature of the operation of mining equipment. The concept of the transition from drill and blast excavation to nonblasting methods in the preparation of mined rock in non-metallic material quarries is presented. The research results of the parameter determination of the elements of the system for the development of non-blasting equipment at a limestone quarry are presented. The economic effi ciency of a hydraulic excavator with a ripper tooth for developing limestone with a strength of up to 30 MPa is established.

Purpose. To establish the optimal parameters of the bench elements and slopes of the pit at the mining of Horishne-Plavnynske and Lavrykovske deposits of ferruginous quartzites for further use of these parameters at the design. Methodology. Methods for determining the influence of the bench height on the productive pit capacity involves taking into account the quality of the ore, the rate of the mining front advancement, the rate of pit depth at the mining operations, the total length of the mining front, as well as the angles of the working and non-working pit slops. Findings. The most effective parameters for mining benches and slopes of an iron ore pit are considered, using the example of the Ferrexpo Poltava Mining. Parameters of the bench elements with a height of 2430 m have been established, which are worked out in layers with a height of 12, 10 and 15 m. The studies carried out made it possible to establish that layers with a height of 10 m, followed by the final and temporary pit contour with a bench height of 30 m, can improve safety due to the flattened slope of the pit up to 45, while, with a bench height of 15 m, the angle of inclination of the slope will be 47. Originality. The established dependence of the pit ore productivity in percentage on the bench height suggests that with an increase in the bench (layer) height, the ore productivity of the pit decreases. Determination of the influence of the working bench (layer) height on the total volume of ore losses in the design contour of the pit makes it possible to assert that at constant angles of the bench slope and the ore deposit fall, the values of operating losses and clogging change in direct proportion to the height. Practical value. A technological scheme has been developed for the development of a bench with a height of 30m with a layer thickness of 10 m, which makes it possible to improve safety in the pit by pit slope flattening to 45, to reduce the cost of ore mining by optimizing drilling operations (shorter drilling time per well, reduction of overdrilling and etc.) and thereby improve the economic performance of the enterprise.