Effective boundaries of chamber-and-pillar development system options

Abstract

One of the main negative features of the group of chamber-and-pillar systems of development are high losses of ore in the left pillars, with increasing depth of mining works the size of pillars increases, and ore losses increase accordingly, reaching 40-60%. Thus, the variants of chamber-and-pillar mining system used at small and medium depths with plunging of mining works to great depths become technically and economically ineffective. Multistage variants of this development system, in particular with excavation of chambers of the first stage and their subsequent backfilling, received experimental and industrial application, including at SUBR. In connection with the increase in the depth of mining operations, an important task in conditions of SUBR is to determine the limits of economic efficiency and further application of classical variants of the chamber-and-pillar system and transition to variants with multistage excavation. In order to design the mining of new, deeper horizons, it is necessary to optimize the parameters of applying the variants of the development system. According to the developed economic-mathematical model the program of ore mining cost calculation was made, the results of calculations of the program were transferred to the electronic tables EXEL, where the effective limits of different variants of chamber-and-pillar system of development were received.