SEARCH AND EVALUATION OF WAYS TO INCREASE EFFICIENCY OF OPENING OF RESERVES OF MINE FIELD DURING THE COMBINED MINING OF LARGE STEEP DEPOSITS

Abstract

The depletion of the potential of open-pit geotechnology at the mining of large steep deposits of low-value ores, caused by the problem of expanding the contours of quarries on the surface, makes the task of technical and economic justification of the feasibility of switching to a combined method of mining at the final stage relevant. The relevance of the study is due to the need to increase the efficiency of opening of reserves of the mine field. Based on the analysis of global experience and trends in the development of opening schemes, a set of organizational and technical solutions has been proposed to improve the efficiency of opening the mine field. The main solutions include: dividing the mine field by height into opening stages, organizing a ventilation and assembly horizon with a group of short ventilation shafts in the quarry, and using a tunnel horizon to transport ore from the skip shaft to the quarry transfer point. For the conditions of combined development of the Bazhenovskoye chrysotile-asbestos deposit, an effective scheme for opening up the mine field reserves has been developed, which allows for minimizing the amount of capital investment during the construction of the mine and the amount of operating expenses during its operation, by maximizing the use of the mine space for opening purposes, including the extraction of ore to the surface.