Purpose is the prediction of coal self-heating and determination of the factors effecting the dynamics of emission of tracer gases (TG) used for routine control of coal self-heating within the production unit involving European approach. Methods. To determine the composition of mine ventilation flows, mine air was sampled into a rubber chambers with the volume of 1 liter; after that, gas content (%) was determined in State Militarized Mine-Rescue Service (SMMRS) gas analytical laboratory with the help of "SIGMA-SO-V" and "Kristall" gas analyzers. Arrangement of sampling points is specified according to the normative document. Sampling periodicity while identifying a threat of coal self-heating within the worked-out area was three hours; in terms of standard conditions, the periodicity was not less than once a day. Period of monitoring within the mine working areas is not less than 9 -10 days. Experimental observations were performed in terms of the production unit of "Pioner" mine and "Pokrovske" mine office.Findings. Innovative approach to routine control of coal self-heating taking into consideration TG dynamics has been tested in terms of the pillar system with return-flow ventilation of a mine section. It has been defined that within the area of expected place of coal self-heating, carbon oxide (CO) consumption within the mine workings was up to 20.59 l/min, and the worked-out area was the source of TG emission; if there were no signs of self-heating, selfheating was not more than 4 -6 l/min. It has been determined that the TG emission nature is effected by geological (coal grade, seam occurrence, and seam disturbance) and technological (development system, ventilation scheme, rate of stoping advance, downtime periods etc.) factors.Originality. It is for the first time when, in terms of mining-geological and mining-technical conditions of Donbas, the factors, determining dynamics of tracer gases within the production unit in terms of pillar system of seam development, have been defined.Practical implications. Possibility to use European methodology of routine control of coal self-heating in Ukrainian mines has been substantiated and validated.

Purpose. Investigation of the seam openings competence in different methods of protection in complex mining and geological conditions of pitch and steep coal seams development of Donbas.Methods. To achieve this purpose, the research uses a complex approach, including analysis and generalization of the openings protection experience, studying the static field of stress distribution in a coal-rock mass on cloudy crystal ball model, a mine experiment to study the haulage gate hardness and the experimental data.Findings. When studying the wall-rock displacements on the haulage gate contour, it was recorded that in the case of yieldable protective facilities usage for seam openings, the roof and foot convergence of the coal bed mining as the productive workings advance is observed until the complete protective facilities compression, and in the zone of steady rock pressure is damped. In the case of coal pillars usage for roadway protection, after the destruction their hardness varies in a linear fashion, which contributes to a significant deterioration in the haulage gate stability behind the face. The use of a goaf stowing for the seam opening protection, from the point of view of stresses distribution in the coal-rock mass, ensures a gentle deflection of the wall-rocks behind the face by increasing the area of the subside strata actual contact with the filling mass, when compared with the roadway protection with the coal pillars.Originality. The effectiveness of the applied method for the seam openings protection is proposed to be evaluated according to the change in the stability of the haulage gate, but taking into account the hardness of the protective facilities. The hardness of protective facilities reflects their ability to resist deformation when the delaminated rock strata is displaced and depends on the value of the external force, the time factor, and the geological conditions of the developed coal seam.Practical implications. The use of a goaf stowing, as a method for controlling the roof or for wide yielding seats located above the roadway, will allow the haulage gates operational condition to be operational and increase the safety of work while maintaining the workings.

Purpose. The influence of the moisture on the physical and mechanical properties of rock is evaluated by the experimental research in the laboratory.Methodology. Laboratory studies of a coefficient of moisture capacity of the rock, determination of strain characteristics and strength, identification of the modulus of deformation and Poisson's ratio, statistical data processing based on correlationregres sion analysis.findings. According to the laboratory studies, the dependence diagrams of the normal stresses from deformations for dry and wet rock samples were obtained. The correlation of stress limit on compression, modulus of elasticity and the coefficient of lateral deformation from the moisture content of the rock were obtained. In the course of the experiment, on the average, differences of mechanical characteristics of dry and wet states of the sandstone were established: stress limit on compressive is decreased almost twice; the modulus of elasticity is reduced by 4 times; the coefficient of lateral deformation is increased by 2.3 times.originality. The empirical dependences of mechanical properties from gravimetric moisture capacity of the sandstone sample were determined on the basis of the experiments in the laboratory. The regression power function was obtained for stress limit and modulus of elasticity, and for the coefficient of lateral deformation it was logarithmic. The coefficient of lateral deformation at the time of the destruction of some wet samples exceeded theoretically acceptable value of 0.5.Practical value. Obtained results can be applied in mathematical or numerical modeling of stressstrain state of the rock given consideration to the importance of the study of the influence of moisture on physical and mechanical markers and properties of rocks. It is possible to control stressstrain state around the roadways using the methods and the means of dewatering or hydro saturation as to coal seams and rocks.

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О. Ю. Попова, д. е. н., професор, завідувач кафедри управління і фінансово-економічної безпеки, ДВНЗ «Донецький національний технічний університет» ORCID ID: 0000-0002-9093-5912 Я. Ю. Дьякова, аспірант кафедри управління і фінансово-економічної безпеки, ДВНЗ «Донецький національний технічний університет»; заступник директора департаментуначальник управління економіки природокористування, поводження з відходами та оцінки впливу на довкілля, Донецької обласної державної адміністрації ORCID ID: 0000-0002-5777-3317 Ключові слова: екологічне оподаткування; природно-ресурсний потенціал; стимулювання; фіскальні інтереси; екологічна політика; бюджет.