Geomechanics substantiation of pillars development parameters in case of combined mining the contiguous steep ore bodies

Purpose. Determining the actual dimensions of protecting and crown pillars ore bodies by seismic survey assessing possibility rock mass collapse fracturing at lower levels Zhairemskoye field. Methods. An integrated approach is used, which involves analysis complete development during combined mining. To determine geological strength index (GSI) rating (RMR), structure studied, as well executed on contours mine workings +288, +240, +192, +144 m. In addition, physical mechanical properties rocks are refined using RocLab software. Using numerical modelling self-caving process, when mining pillars, processed results analysed possible zones deformation assessed based Phase2 Findings. It has been determined that 4 6, between quarry underground mine, up to level m, displacements along glide surfaces. revealed haulage +240 +192 m fall into zone influence, pillar 6 will be exposed inelastic deformations found after for body destructions since modelling, more than 2 mm observed. this case, destruction processes in upper part. Originality.A geomechanical assessment tendency caving given problem areas stability field identified. Practical implications. The stable parameters have substantiated, an important aspect design/efficient technology contiguous bodies. Keywords: engineering seismic, body, pillar, level, iron, manganese