NEW VARIANTS FOR WIDE OREBODIES HIGH–CAPACITY MINING SYSTEMS WITH CONTROLLED AND CONTINUOUS IN–LINE STOPING

Abstract

. The work is devoted to achieving the goal of creating a cost-effective, technologically feasible and safe mining scheme for high-capacity ore bodies with controlled and in-line stoping. The directions of scientific research are methodologically grounded. Breaking-out out of ore by vertical fans (less often by parallel wells) at level excavation with tight-face blasting on a layer of the massif beaten off by the previous explosion or on a wall of the caving rock carries a danger of excessive dilution, discrepancy of particle size distribution of the beaten off mass to optimum fractional distribution and additional difficulties at release. The formation of the initial cut-off riser and the creation of a compensating space from it is also a difficult process to manage. Releasing ore under cover of the stump pillar or from undercut rock is inefficient primarily due to additional tunnelling, ore loss and dilution. In the case of sublevel caving, the amount of rock excavation for the design of transport gradients and their entry points to the sublevels is significant. The proposed technological scheme of ore blasting by means of explosive borehole fans drilled from a drill winze by a