Assessment and selection of a rational option for the opening of near-contour reserves during open-underground mining of upland deposits

Abstract

The article considers a combined method of mining the Karakutan deposit and substantiates two systems of opening the contiguous reserves by the open-underground method. The development of short-circuit reserves provides for the use of the worked-out space of the quarry for the opening of ore zones by horizontal, vertical or inclined workings with the combination of open and underground mining cargo flows into a single cargo flow. The transition to underground mining is expected at the last stage of completion of the open pit. Due to the fact that there are more reserves behind the contours of the quarry, deposits that it is advisable to work out in an open-underground way.