The object of research is the processes of destruction of a complex structural rock mass, excavation and transportation of rocks, crushing and dry magnetic separation of iron ore raw materials in deep quarries. The purpose of the paper is to determine the regularities of the parameters of the stream of ore mass from the geomechanical features of the deposit, physical and mechanical characteristics of rocks and technical and technological parameters of extraction and processing under the influence of drilling and demolition works and dry magnetic separation, which can justify adjustments to the production capacity of the quarry and to develop technological schemes of enrichment for the implementation of new extraction methods and processing of iron ores. Research methods. To solve the problems, a complex method was used, which included: a technical and economic research of the operation of mining enterprises, and the experience of using dry magnetic separation equipment at the concentrating factories - to substantiate the purpose and relevance of the research; logging of magnetic arousal of drilling rocks and blasting wells - to detect the structure of the deposit; nature and visual observations - for studying the features of the geological structure of deposits of Kryvbas; the method of oblique photoluminescence - for the determination of the granulometric composition of the rock mass after the explosion; experimental research in landfill conditions influencing the anisotropy of strength properties on a piece of mountain mass; methods of qualimetry - for substantiation of qualitative indices of ore mass; simulation of technological processes - to choose the best technical solutions.
The influence of orientation of the explosive cavity axis relative to the plane of the contact zone of a complex structural mass on the parameters of conditional crushing of the rock mass is experimentally established for the first time. For the first time, regularities of the depletion of the ore flow and mineral resources losses under the influence of mining-geological conditions of development, technical characteristics of the equipment, technological parameters of extraction have been established, which allowed to develop and substantiate new methods of extraction and processing of iron ores. For the first time, the classification of "ore-bearing rocks" contact zones has been developed based on geological and technological features. For the first time, analytical dependence of the productivity of the concentrating factory on the established relationship of the production capacity of the quarry, the productivity of the expansion complex and the pre-enriched ore complex in the quarry are determined. The method of estimating the parameters of mining works is developed, where the preparation of the mountain mass for its further processing is carried out by exploding destruction of strong anisotropic rocks in the mining block of complex geological structure. New ways of extraction and processing of iron ores and rock formations at internal and external quarrying reloading points have been developed.
Expected annual economic effect of pre-enriching technology application for the rocky breeds of stripping in the conditions of the Peter quarry PJC "Central MCC" made a 27 401,96 thousand UAH. Term of return on capital investments 2,4 year, that at 2,8 time below than normative (6,7 year). The scientific and technical basis for the creation of technology for pre-enrichment of ore in deep iron ore quarries, technical proposals, methods and recommendations have been developed, methods for mining and ore processing that have been introduced into projects and transferred to specific organizations and mining enterprises of the Kriviy Rih iron ore basin have been developed.
