FIELD: mining.
SUBSTANCE: invention relates to mine industry and can be used during opening and open mining of deep laying steep dipping fields having round form and using temporary nonworking sidewalls. For this the method and open mining of steep dipping fields comprising forming of the work zone, a process of mining of open-pit benches, and ensuring load transportation link of work horizons with surface, a pit space through depth is divided to two zones, in top zone at side of laying sidewall a first queue of mining is allocated adjacent to the end sidewall of the borrow-pit, and opening are formed, at side of hanging sidewall the first queue is limited by the temporary nonworking sidewall with inclination angle close to the limit angle, and opening drifts are located on it. Base of the temporary nonworking sidewall has horizontal sites protecting against rockfall, their width is accepted considering location of the slope out of falling rocks, embankment protecting against stones with installed hydraulic excavators of backhoe type and motor roads. After first queue development the second queue of borrow pit formations is started, i.e depreservation of temporary nonworking sidewall and development of the adjacent volumes with simultaneous decreasing of mine works in central part of the borrow pit. Wherein development of volumes during depreservation of the temporary nonworking sidewalls performed during longitudinal movement of radially oriented front of mine works. Mined rock falling during depreservation of the temporary nonworking sidewall downward on the stone protecting site is loaded to vehicles by a hydraulic excavator installed on the stone protecting embankment, and removed to surface. On the formed end sidewall the opening mine workings are arranged instead of lost due to depreservation of the temporary nonworking sidewalls. During further decreasing of the mine works at side of the hanging sidewall one additional nonworking sidewall is formed, also with stone protecting site in its base, wherein the additional nonworking sidewall is depreserved by a method used during depreservation of the temporary nonworking sidewall of the second queue.
EFFECT: invention reduces current overburden ratio during the initial period of field development.
3 dwg
