DEVELOPMENT OF UNDERQUARRY PROTECTIVE PILLAR IN CONDITION OF ITS UNDERWORKING
One of the problems taking place during development of ore deposits is untimely preparation of reserves to extraction. Hence, entire effectiveness of the development is reduced. Therefore, for the reserve replacement previously left different ore pillars are developed more often. That's why issues related to safe extraction of pillars are currently important in modern conditions of deposits. In the context of one of gold ore deposit with strongly marked geological structural indetermination of solid the method of extraction of previously left underworked underquarry protective pillar is proposed and justified for keeping of productive capacity and provision of the deposit stable functioning. In the work geo-mechanical model of the deposit represented with general technological scheme of mining during extraction of previously left underquarry pillar with saving of actual mine technical infrastructure conditioned with open and underground development of the deposit is developed. Numerical finite element simulation has been adopted as main instrument for the study. It is established by calculations that underground extraction of underworked underquarry protective pillar of steep ore deposit is limited with extension of wide zones of possible solid destruction with way out into daylight surface due to significant broken condition of the deposit.