Сomprehensive evaluation of strategy for mining of iron ore deposits by environmentally-balanced underground geotechnology

For the purpose to solve the problem of reducing the negative impact of mining and processing production on the environment that is relevant for most mining regions of Russia, options of geotechnological strategy for mining of iron ore deposits on the basis of an ecologically balanced integrated underground geotechnology of extraction and processing of iron ore, which allow to utilize the entire volume of mining and processing waste in the mined out space and transfer the most environmentally hazardous enrichment process under the ground, have been formed. Technological schemes for chamber excavation of floors in ascending order have been developed, which make it possible to abandon the formation of ore pillars, thereby increasing the extraction of ore from the bowels, and using the worked out space for waste storage in the form of a dry backfill. Based on economic and mathematical modeling and a comprehensive assessment according to the environmental and economic criterion for the conditions of mining in a new step of one of the largest iron ore deposits in Russia the most effective option of geotechnical strategy has been established. Use of an ascending-descending order of floor mining with an optimal ratio of mining systems with laying out the worked out space and systems with collapse depending on the content of the useful component in the ore mined, the amount of space mined current tab and the volume of tailings used as backfill material, allows to utilize the entire volume of mining and processing waste in the mined out space and effectively to develop of reserves in a new step.