Given the growing societal demand for the development of enterprises that ensure minimal environmental impact, there is a need to develop waste-free technologies. The concept of realizing the potential of technogenic waste is an integral component of creating a circular economy. The aim of this study is to utilize technogenic waste in a safe, environmentally balanced, and economically efficient deposit mining technology within the framework of a circular economy. The necessity of transitioning from a conventional mining system to multi-stage extraction systems for the mining of potassium-magnesium (water-soluble) ores is substantiated. The possibility of completely replacing specially mined components of the backfill composite with technogenic waste, including potassium-magnesium ore beneficiation waste, granulated blast-furnace slag, and deactivated ZSM-5 zeolite, is confirmed. It is established that the use of ZSM-5 as an activator and fiberglass as an inhibitor makes it possible to form a backfill composite with improved strength characteristics. The optimal composition of the backfill material includes 60 % beneficiation tailings, 29.7 % granulated slag, 0.3 % fiberglass, and 10 % ZSM-5. It is demonstrated that the use of multi-stage extraction with backfilling of the mined-out space enhances the environmental and technological safety of mining potassium-magnesium (water-soluble) ores. It is established that technological safety is achieved by minimizing horizontal deformations of the undermined rock mass, thereby ensuring the preservation of the water-protective stratum and relieving inter-chamber pillars from increased stresses, which contributes to their greater stability over time. It is determined that environmental safety is achieved through the utilization of technogenic waste in the backfill composite, as well as through the reduction of horizontal deformations of the undermined rock mass, thereby minimizing disturbance of the ground surface.

The paper presents the results of studies of the predictive models development based on retrospective data on planned electricity consumption in the region with a significant share of enterprises in the mineral resource complex. Since the energy intensity of the industry remains quite high, the task of rationalizing the consumption of electricity is relevant. One of the ways to improve control accuracy when planning energy costs is to forecast electrical loads. Despite the large number of scientific papers on the topic of electricity consumption forecasting, this problem remains relevant due to the changing requirements of the wholesale electricity and power market to the accuracy of forecasts. Therefore, the purpose of this study is to support management decisions in the process of planning the volume of electricity consumption. To realize this, it is necessary to create a predictive model and determine the prospective power consumption of the power system. For this purpose, the collection and analysis of initial data, their preprocessing, selection of features, creation of models, and their optimization were carried out. The created models are based on historical data on planned power consumption, power system performance (frequency), as well as meteorological data. The research methods were: ensemble methods of machine learning (random forest, gradient boosting algorithms, such as XGBoost and CatBoost) and a long short-term memory recurrent neural network model (LSTM). The models obtained as a result of the conducted studies allow creating short-term forecasts of power consumption with a fairly high precision (for a period from one day to a week). The use of models based on gradient boosting algorithms and neural network models made it possible to obtain a forecast with an error of less than 1 %, which makes it possible to recommend the models described in the paper for use in forecasting the planned electricity power consumption of united power systems.

The oil and gas industry has been an integral and fundamental sector of the Russian economy for the past few years. The main problems of this industry have traditionally been the deteriorating structure of oil reserves; depreciation of main assets; slowdown and decline in oil production. Recently these have been complicated by a number of new negative trends related to underinvestment, limited financial resources, deteriorating access to new equipment and technologies. The task of the research is to make a comprehensive assessment of hydraulic fracturing technology during well construction and to increase the recovery and intensification of hydrocarbons production. In this research, modeling techniques were used to assess the productivity of each fracture. Geophysical methods (seismic survey) were used to determine the geomechanical properties of the formation. Comprehensive assessment of hydraulic fracturing technology during well construction was carried out, which allowed to increase vertical permeability and unite disparate parts of the reservoir in practice, and to determine the development efficiency of the hydrocarbon field.

The paper presents the results of constructing effective relay protection in the power supply system of a mining and processing plant (MPP). A brief description of the MPP is given, the power supply and substitution circuits used to calculate the short-circuit currents are given. A statistical analysis of failures in the electric network of the MPP has been carried out, which makes it possible to draw conclusions about the nature of failures ranges. Analysis of the registered faults shows that a significant part of them are line-to-earth faults, which in most cases turn into multiphase short circuits, which are interrupted by overcurrent protection. In order to improve the efficiency and reliability of the relay protection, the power supply scheme of the MPP was refined and analyzed. The calculation of the short-circuit currents was made, which made it possible to calculate the settings of the relay protection and give recommendations on the place of its installation and adjustment in order to ensure the normal operation of electricity consumers. To reduce the number of failures to the cable insert on the line leaving the administrative and household complex (AHC), and to increase the reliability of power supply to consumers, it is advisable to divide the capacities of the existing 10 kV line into two parallel ones by laying a second line. It is recommended to install a current cut-off on the line outgoing to the AHC, the feasibility of the installation of which was shown by calculations. This will reduce the chance of failures to the cable gland. Data on the setting currents of overcurrent protection and current cut-off are given on the selectivity card.