Method for opening and preparation of WORKING LEVELS of a pit under conditions of open-pit development of steep deposits

摘要

Method for opening and preparation of horizon of a pit under conditions of open-pit development of working steep deposits includes simultaneous penetration of several inclined trenches in kidney-like shape contour section of which is uniformly distributed and penetrated in circle of outer contour of openings workings. Construction of radial section of inclined trenches is characterized with change of direction of penetration of those to side of circle of outer contour of opening workings in which those diverge. End of period of penetration of kidney-like inclined trenches is characterized with simultaneous formation of active front of mining operations of each excavator and formation of through layout of motion of transport in loading and empty directions. After the end of stage of working out mining rocks in contoured section mining operations at horizon are developed in any direction with liquidation of one or two descents. The invention provides increase of productive capacity of pit on extraction works due to increase of rate of deepening of pit and increase of productivity of mining-transportation equipment.