Resource-saving technology of magnetite quarzite underground mining

Abstract

The need to involve in the underground extraction the magnetite quartzite underground deposits, which lie in the fields of Kryvbas mines, in order to expand the raw material base of underground mines and reduce the intensity of the development of high-grade ore, is an actual problem. The carried-out technical and economic analysis of surface-chamber system of development with ore breaking and vibrorelease showed that the technology of magnetite quartzites underground production, which is now applied on Ordzhonikidze mine is characterized by low technical and economic indicators in comparison with similar technology on the basis of dump techniques. For change patterns establishment of ore extraction indicators from thickness of the cave floor pillar and distance between loading arrivals during the application of the block trench bottom and load-haul-dumpers, the laboratory researches which allowed to establish the floor pillars optimum parameters and the trench bottom design were conducted. As a result of laboratory studies the regularities of change of indicators of losses and contamination of ore, which allowed to justify the size of the structural elements of trench bottoms blocks was established. The passport of superficially chamber system of development of thick deposits of magnetite quartzites using load-haul-dumpers, which should be used in the design of underground mining of magnetite quartzite deposits at existing Kryvbas mines is developed. The developed of high-performance surface-chamber system of development of steeply dipping magnetite quartzites thick deposits with drill carriages and loadhaul-dumpers will allow to improve the technical and economic indicators of system in 1, 5-2 times.