Purpose. The identification of geomechanical problems of mining industry wastes accumulation and substantiation of the ways for their solution with the possibility of processing the watery technogenic feedstock by fine classification with dewatering. Methods. To achieve this purpose, an integrated approach is used in this work, which includes the scientific and technical analysis of research according to wastes accumulation, state statistics data, analytical studies of the strata compaction ratio of aqueous rocks, affecting the subsidence of the earth surface. This also includes the bench experimental studies to establish the dependence of changes in moisture content and the extraction of fine classes in screened products depending on the screening time at shock-vibrating screening by a new method for separating the enrichment wastes before to stockpile them into a pond.Findings. The developed mathematical apparatus has been proposed for determining the parameters of geomechanical processes in technogenic massifs. It has been shown that in order to reduce the technogenic load and manifestation of negative geomechanical processes, it is necessary to reduce the area of land under the waste ponds and the accumulated volumes themselves of mining and enrichment wastes. The dependences have been established of the preliminary enrichment complex on the qualitative parameters of the feedstock and the technological parameters of the equipment. It has been revealed that the mineral stock, formed from wide grain-size classes with a high content of particles less than 0.2 mm, is dewatered up to 18 -22% by traditional methods and is practically not classified.Originality. A mathematical model has been proposed of screening and dewatering kinetics, which takes into account comprehensively the initial distribution of particles and liquid throughout the height of the screened material layer, segregation, mixing, sifting, vibrational transportation features (rate, multiplicity and number of falls over the period of vibrational transportation) and change in the height of the layer. This model is different due to the account of the mutual influence of classification by coarseness and dewatering.Practical implications. The represented dependences can be used to predict the development of negative geomechanical processes. The obtained results make it possible by means of a calculation to determine rational parameters of the screen and screening process with dewatering at processing of various feedstock with the use of initial data. The use of technology, which includes a fine classification in wastes processing, will allow: increase the economic efficiency of enterprises; to expand the feedstock base for construction, coke and chemical industries and power industry; to solve the problems of creating additional containers for storing the wastes; to improve significantly the environmental situation in the mining and processing regions.

Air pollution has remained a primary concern over the last decades. Respirable particulate matters (PM) PM2.5 and PM10 are the main atmospheric pollutants that have an adverse effect on human health. This study aimed to examine the air quality of Kryvyi Rih region through the spatial assessment by means of Ordinary Kriging. The study region has a major iron ore basin with several open cast mining operations and industrial activities, which are mainly contribute to the environmental issues. For the study, 10 monitoring stations were chosen located around the main residential and industrial areas of the city. The results showed that industrial plants were the largest sources of PM emissions. The average Air Quality Index (AQI) of PM2.5 and PM10 for the observed period obtained from the station located in close vicinity to the industrial plants were 170 and 89 respectively. Additionally, the 48 hours of PM dynamics were graphically analysed. It was found that PM reaches a peak primary between 12 AM and 12 PM before falling a little between 12 PM and 12 AM.

Purpose is to substantiate the use of an in-pit crushing and conveying technology at the open pits with complex structure of the working zone, which technological complex includes inclined and steeply inclined conveyors for improved economic efficiency of mineral mining at deep levels. Methods. The study applies a complex method including: technical-economical analysis of the practice of mining enterprises, experience of using conveying units at concentration plants and open pits; mining-geometrical analysis in terms of open pit sections – to identify the structure of the working zone of a deep open pit wall and its features along the depth; structural developments – to improve the design of a steeply-inclined conveyor; simulation modelling of the technological processes – to select optimal technical solutions. Findings. Basing on the performed studies, it has been identified that transfer to a new trend of the in-pit crushing and conveying technology, considering the structural features of the working zone of a deep open pit, is rather prospective. In this context, it is expedient to use inclined conveyors or deep-trough conveyors on the sites of an open pit wall with the inclination angle of 10-18°; in case of sites with the inclination angle of 30-36°, it is recommended to use steeply inclined conveyors. Originality. For the first time, a relation between the working zone of a deep open pit and formation of the structure of technological complexes has been identified. Dependences of the boundary inclination angle αn of a pipe conveyor on the angle of non-filling θ of its belt with the cargo at different coefficients of cargo-belt friction have been defined. Practical implications. The obtained results make it possible to widen the application sphere and increase the efficiency of mineral mining with the use of in-pit crushing and conveying technology.

A technique to process rock mass from hard-rock technogenic media has been developed; it is aimed at recovery of mineral losses, restoration of the environment at the territory of mining enterprises by means of rock mass extraction, its processing and redistribution for the purposes of land recultivation and landscape restoration. Classification of dry ore-containing hard rocks of dumps has been developed; that has made it possible to improve technological scheme of the processing of rock mass from technogenic media, emphasize its variants of use, and specify the required facilities and their productivity. Scientific value of the paper is in determining the effect of changes in the losses in pre-processing dry wastes upon the yield of industrial product and wastes; the effect has demonstrated that the yield of industrial product is in polynomial dependence upon the pre-processing losses while yield of tailings is in the power dependence. Practical implications of the paper are in the fact that the proposed method helps form mesorelief with the properties close to the natural one. The method involves restoration of the initial landscape with the help of opening hard rocks followed, completed by laying water-bearing and potentially fertile layers.