METHOD FOR LARGE-SCALE EXPLOSIVE DESTRUCTION OF MINE ROCK MASSES OF COMPLEX STRUCTURE FOR SELECTIVE EXTRACTION OF MINERAL DEPOSIT AT OPEN-PIT MINING

摘要

FIELD: blasting operations.;SUBSTANCE: invention refers to mining industry, and namely to open-pit mining operations at development of ore and non-ore blocks of mineral deposits, the sections of which are sufficiently different as to mining-and-geological structure and quality of a valuable component, and namely to selective extraction of a mineral deposit by large-scale explosive destruction of mine rock masses of a complex structure. In rows of charges, which cross different-type mine rocks, well and group beam charges are located; group beam charges are located in sections requiring intense crushing. The latter are located in sections requiring intense crushing with direction of a convex beam surface towards intense crushing; row-by-row explosive breakage of single well and group beam charges is performed, thus performing row-by-row extension of nominal diameter of an explosion cavity.;EFFECT: preserving integrity of geometry of locations of large volumes of mine rocks within their initial geological location before and after large-scale explosions.;2 cl, 3 dwg