METHOD FOR DEVELOPMENT OF STEEP ORE BODIES Russian patent published in 1998 - IPC

FIELD: mining industry. SUBSTANCE: this can be used in development of steeply pitching ore bodies for example kimberlite pipes by underground method. According to method, ore is broken in bench-like single-stage procedure with discharge to squeezed medium. Before firing explosive charges in current seam in raising bore-holes from work-face space which is adjacent to stratum, simultaneously carried out is release of ore by means of at least two vibrating feeders with creation of single common zone in work-face space. Aforesaid ore was broken and loosened prior to that. Amount of batch of released ore must be not less than 15% and not larger than 30% of volume of broken ore stratum. Remaining part of ore from broken stratum is subjected to shrinkage and after layer-by-layer breaking of ore in entire block, ore subjected to shrinkage is released by simultaneous and proportioned engagement for operation of all vibrating feeders in block with creation of common flow of ore in worked-out space and uniform lowering of contact of broken ore and filling material of worked-out space for example ice and barren rock. In addition, in developing sublevel which is adjacent to quarry bottom, and prior to breaking current stratum of ore, performed is end release of ore. This operation is carried out by means of self-propelled loading and carrying machines. Left in worked-out apace is ore which is subjected to layer-by-layer shrinkage at angle of repose. Beginning from mouth of ore-hauling entry and after layer-by-layer breaking of ore in entire sublevel, placed onto ore subjected to shrinkage is filling material of worked-out space for example ice. Ore subjected to shrinkage is released simultaneously with release of ore subjected to shrinkage from sublevel lying below. Application of aforesaid method provides conditions for layer-by-layer breaking of ore on squeezed medium with ensuring controlled release of broken ore in block without mixing. EFFECT: higher efficiency. 1 cl, 16 dwg