FIELD: mining.
SUBSTANCE: invention refers to mining, particularly to development of steep ore bodies by underground method. After driving workings of discharge along the center of the block there is arranged a recess on thickness of the ore body transversely to the strike of deposit. Descending complexes of boreholes are drilled from the recess with symmetrically arranged horizontal bores in a hanging layer of the ore body parallel to the plane of ore body occurring. Drilling, charging and blasting of bores is performed stage-by-stage in the upward direction leaving a temporary massif of height h; further descending fan-like complexes of bores are drilled in the temporary massif, then they are charged and blasted. After each cycle of drilling, charging and blasting partial discharge of muck is performed. Then a canopy is formed in a hanging wall of the ore body by means of filling the produced space with hardening backfilling material through the recess; when the material has hardened, under protection of the formed canopy there is performed working of the block store; also height h of the temporary massif is accepted as minimal radius Rmin of a boring rod curve.
EFFECT: reduced impoverishment at working chamber stores; increased efficiency of block during mining excavation and reduced general labour intensiveness at working of chamber stores.
7 dwg
