In the Karaganda coal basin, deteriorating geomechanical conditions have been observed, including seam disturbances, diminished strength of argillite–aleurolite strata, water ingress, and pronounced floor heave, all of which markedly increase the labor intensity of maintaining developmental headings. The maintenance and operation of these entries for a reference coal yield of 1000 t necessitate 72–75 man-shifts, of which 90–95% are expended on mitigating ground pressure effects and restoring support integrity. Conventional heave control measures—such as relief drifts, slotting, drainage, secondary blasting, and the application of concrete or rock–bolt systems—deliver either transient efficacy or incur prohibitive labor and material expenditures while lacking unified methodologies for predictive forecasting and support parameter design. This study therefore advocates for an integrated framework that synergizes geomechanical characterization, deformation prognosis, and the tailored selection of reinforcement schemes (incorporating both sidewall and floor-anchoring systems with directed preloading), calibrated to seam depth, geometry, and lithological properties. Employing deformation state assessments to optimize reinforcement layouts for floor stabilization in coal mine workings is projected to curtail repair volumes by 30–40% whilst significantly enhancing operational safety, efficiency, and the punctuality of face preparation.

Purpose. The purpose of this research is to develop a scientifically sound system for managing the coarse-grained raw coal at JSC Shubarkol Komir enterprise based on comprehensive geophysical diagnostics of structural weakening and fracturing zones in coal seams. The research aims at improving the efficiency of drilling-blasting operations, reducing the proportion of fines and ensuring the stability of quarry benches through the use of geophysical rock mass state indicators. Methods. The research was performed using a set of geophysical methods, including electrical resistivity prospecting using the Electrical Tomography (ERT) method, electrical prospecting using the Mean Gradient (MG) installation, seismic prospec-ting using refracted waves (Refraction Seismic, RS) method, Spectral Seismic Profiling (SSP), ground-penetrating radar (GPR) surveying and radonometry (emanation surveying). Complex data interpretation was performed using 3D modeling of the specific electrical resistance (ρ) and longitudinal wave velocity (Vₚ) distributions, as well as statistical analysis of correlations between ρ, Vₚ and C(Rn) parameters. Findings. It has been found that a decrease in specific electrical resistance below 60-100 Ohm·m and a decrease in longitudinal wave velocities below 1500-1800 m/s reliably reflect the development of fracturing and loosening of the rock mass. Radon concentration increases by 1.5-2 times in the same zones, confirming their tectonic activity. ERT and MG methods are recognized as basic for diagnosing weakened zones, RS method – as a calibration method, radonometry – as a verification method, and SSP and GPR methods – as methods that are limited in their applicability in conditions of high water content. Originality. For the first time for the Shubarkol deposit, a comprehensive methodology for cross-spectrum analysis of electrical, seismic and radiation parameters has been developed and tested, providing a quantitative assessment of the geomechanical state of the mass and a prediction of its structural changes. Practical implications. The implementation of the proposed methodology allows for the identification of weakening zones with an accuracy of ±5 m in depth and ±10 m along the strike, the adjustment of parameters of drilling-blasting operations, a 3-5% reduction in the proportion of fine material (< 6 mm), and an increase in the stability of quarry benches.

The development of a geomechanical model is aimed at enhancing the safety of mining operations through the determination of optimal slope angles and the probabilistic assessment of pit wall stability. For the conditions of open-pit mining, three-dimensional geomechanical models were constructed based on the calculation of the slope stability factor using the Rocscience Slide2/Slide3 (v.9.027, 2023) software package. The stress–strain state of the rock mass at the final stage of extraction was evaluated using the finite element method. Strength reduction factors (SRF) were determined considering the physico-mechanical properties of the rocks forming the near-contour zone of the massif. The stability of the pit slopes was assessed along individual geological cross-sections in accordance with the design contours of the Northern Katpar open pit. Calculations performed using several methods confirmed the overall stability of the pit walls. The final design parameters of the projected open pit were determined. For the first time, it was established that in the southern and southwestern sectors of the Northern Katpar pit, within the elevation range of +700 to +400 m, a reduction in the SFR (from 1.18 to 1.41) occurs due to the predominance of siltstones and the presence of tectonic disturbances. The generalized results of numerical slope stability analyses for the design pit contour, together with the developed geological–structural model of the deposit, provide a basis for ensuring the safe conduct of mining operations at the site.

The development of mining operations in high-altitude regions is associated with a number of geomechanical challenges caused by increased rock fracturing, adverse climatic conditions, and high seismic activity. These issues are particularly relevant for the exploitation of gold ore deposits, where the stability of open-pit slopes directly affects both safety and extraction efficiency. The aim of this study is to develop and practically substantiate a comprehensive approach to assessing and ensuring slope stability, using the Bozymchak gold ore deposit—located in a high-altitude and seismically active zone—as a case study. The research involves the laboratory testing of rock samples obtained from engineering–geological boreholes, field shear tests on rock prisms, laser scanning of pit slopes, and digital geomechanical modeling. The developed calculation schemes take into account the structural features of the rock mass, geological conditions, and the design contours of the pit. In addition, special bench excavation technologies with pre-shear slotting and automated GeoMoS monitoring are implemented for real-time slope condition tracking. The results of the study make it possible to reliably determine the strength characteristics of the rocks under natural conditions, identify critical zones of potential collapse, and develop recommendations for optimizing slope parameters and mining technologies. The implemented approach ensures the required level of safety.

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