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The complicated geology and geomechanics in Tashtagol, Sheregesh and Kaz mines induce geodynamic events during transition to deeper level mining. Mining advance from the higher stress concentration areas from the hanging wall of a fault towards the lower stress concentration areas contributes to the reduction in rockburst hazard. The use of the self-propelled equipment allows higher volume of preparatory driving per 1000 t of ore production by 10-20% as compared with the portable equipment. The mechanism of rock mass movements in deeper level stoping is revealed. High mining depth and high strength of enclosing rocks are favorable for starting extraction of ore reserves left in pillars. The combination of these factors and the efficient mining system design enable mining of blind ore bodies without backfill and allows extraction of ore reserves from pillars under the rivers and ground surface infrastructure.

The methods and means of dumping overburden at open pit coal mines in Kuzbass are reviewed. Specific features of dumping are highlighted, and the dependence of dump stability on geological conditions and physical properties of overburden is determined. The priority lines of development in the dumping technology are aimed at efficient utilization of mined-out areas in open pits and idle hydraulic fills. The issues of the environmental safety of dumping are addressed.

The article gives testing data on the effect exerted by energy impacts (ultrasonic, electrochemical and thermal) on the recovery of zirconium and rare earth elements from eudialyte concentrate to pregnant solution by acid leaching. An original installation is developed for the implementation of leaching. Based on the research findings on the kinetics of acid leaching of eudialyte concentrate and on the change in the concentrate micro-structure and phase composition, the mechanism of the influence of integrated energy impacts on the efficiency of recovery of zirconium and rare earths in pregnant solution is substantiated.

The interaction of fatty acid sodium oleate collector and higher isoalcohols in liquid phase and on the surface of separated minerals of scheelite and calcite is investigated. The research findings on monophase calcite and scheelite are presented with their X-ray patterns and IR spectra. The experimental data show the contribution of the intramolecular interactions in combinations of differently ionizable oxyhydryl collectors on the increase in the contrast between floatabilities of scheelite and calcite. The IR spectroscopy states that the maximum strength of the intramolecular hydrogen bridges between oleate and isoalcohols in the range of 300-3200 cm-1 fits with the molar ratio 2. Isoalcohols in the surface layer of scheelite neutralize hydrophilic behavior of oleate micells by means of generation of heteromolecular associates through hydrogen bridges, loosen hydtrated layer and enhance air bubble attachability; adhesion of isoalcohol drops improves floatability of scheelite; higher isoalcohols reduce flotation activity of calcite. The maximum contrast in flotation properties is observed in slimes at oleate concentrations fit the micelle formation process.

The experimental research into intensification of copper-nickel ore concentration by flotation and magnetic separation shows that pre-treatment of ore before milling by accelerated electrons results in the increased yield of - 0.071 mm size and in enhanced recovery of useful components in the concentrate. Magnetic separation improves complexity of use of mineral raw materials.

The article describes features of ore reserves and development of processing technologies at Mikhailovsky MPP. New approaches to disintegration of ore and to improvement of dry magnetic separation of unoxidized ferruginous quartzite are evaluated. The scope of the discussion embraces the process of finishing magnetite concentrate, extracted from unoxidized ferruginous quartzite by wet magnetic separation, using the flotation flow chart with the closed and open circuits, as well as the reverse cation flotation of hematite concentrate from tailings of wet magnetic separation. The authors present process solutions aimed at designing energy-saving conveyor roasting machine MOK-1-592 and the technologies of production of different purpose iron ore pellets.

A Stefan problem is analyzed for the case of rock freezing during shaft sinking, It is shown that the rate of thermal diffusion in rock mass is comparable with the velocity of the boundary between different phases. The Stefan problem is solved for a single shaft using the finite difference method. The procedure for the generalization of the calculation data on thickness of an ice-and-rock shield in a single shaft for the case of many shafts is improved. The ice-and-rock shield thickness forming around freezing pipes is calculated in terms of shaft 1 in the mine of Petrikovsky Mining and Processing plant of Belaruskali.

The authors propose to assess air pollution in mining regions using the integrated instrumental monitoring, calculation and remote sensing. The algorithms for experimental data processing for the calculation and remote monitoring of snow cover pollution as a universal indicator of the pollution distribution in air are substantiated. The article presents the integrated monitoring data on the induced load in the air in the large mining industry cluster in Kuzbass.

The authors propose the approach to validation of the surveying control accuracy in safety monitoring of earth dams in terms of liquid waste receivers at mines. Based on the system structuring of types of earth dams and their elements, estimation of influence of loads and effects exerted to these structures, as well as the analysis of accident The article presents the installation meant for the determination of gas permeability of rock specimens placed in a testing cell with the adjustable axial and lateral compression. The installation includes a measurement system for the automated long-term investigation of rock permeability in accordance with the preset program. It is also possible to test specimens with a fracture filled with a propping material. The reported data of the permeability tests of porous quartz-containing material and coal demonstrate the capacity of the installation and the experimentation specificity.

The article presents the review of the current methods used in Russia and abroad to predict accidents in underground mines based on the monitoring of stresses, strains and seismic and electromagnetic events. The phenomenon of emission of submicron particles is reveled in rocks and the submicron particle emission under compression of rock specimens is modeled physically. A conclusion is drawn on the possibility of developing a new method and equipment for the prediction of accidents during underground mining.