METHOD FOR OPENCAST DEVELOPMENT Russian patent published in 2010 - IPC E21C41/26 

FIELD: mining.

SUBSTANCE: invention relates to mining industry and may be used in open development of steeply inclined, deeply deposited mineral deposits with limited plan area. Method includes formation of ramp for large-capacity dump trucks from the start of outlet of working hanging wall of opencast to its final contour along border of working and final walls on temporary sight pillar of lying and hanging wall rocks and ledges in lower part of opencast working wall. Ramp for small-capacity dump trucks is arranged parallel to this ramp from surface on working wall of opencast. When formation of ramp for large-capacity dump trucks in lower part of opencast due to reducing space becomes impossible, pillar of rocks under ramp for large-capacity dump trucks is developed together with volume of rock mass that remained in final contour of opencast. In process of development small-capacity dump trucks are used to transport rock mass along ramp for these dump trucks, which is arranged on final walls of opencast from surface to horizon of opencast design depth as working ledges get suppressed.

EFFECT: reduction of costs for development of mineral due to reduction of overburden volume for extraction in arrangement of vehicle ramp at final walls in upper part of opencast.

2 dwg