Abstract
The work considers conditions of deep levels of the Underground Mine Group for underground ore mining (as underground mines) of the Mining Department of the PJSC “ArcelorMittal Kryvyi Rih” (the PJSC “ArcelorMittal Kryvyi Rih”). The research aims to improve indicators of mined ore mass extraction when mining rich iron ores through studying and optimizing consumption of explosives, enhancing mining technology to provide fulfilment of the underground iron ore mining program. During the research, there are analyzed mining geological and technical conditions of the deposit mining as well as current technologies of iron ore mining at the Underground Mine Group of the PJSC “ArcelorMittal Kryvyi Rih”. The work analyzes the achieved indices and consumption of explosives for drilling and blasting at the Underground Mine Group. The mining geological and technical conditions of the deposit mining as well as current technologies of mining, parameters of preparatory operations, the nomenclature and qualitative characteristics of many types of explosives are determined to have changed. This complicates planning consumption of explosives and making their estimates for work sites. However, this is a reason for selecting highly efficient technology and machinery in deteriorating mining and geological conditions of operating at over 1200 m depths. The work determines dependencies of a stress value on a mining depth and physical properties of rocks, as well as parameters of drilling and blasting operations considering the stress-strain state of the massif under high rock pressure at deep levels of the Mining Group of the PJSC “ArcelorMittal Kryvyi Rih”.
Highlights
IntroductionDeepening of mining operations causes deterioration of mining-geological conditions of the iron ore deposit
– Analysis of the technology of mining iron ores applied at the Underground Mine Group of the PJSC “ArcelorMittal Kryvyi Rih”;
The minefield of the deposit is located in the southern part of Saksahanska band which is the eastern Kryvorizka syncline limb
Summary
Deepening of mining operations causes deterioration of mining-geological conditions of the iron ore deposit. Decrease of the deposit thickness and iron content in ores is one of the major deterioration indicators. Deterioration of mining-geological conditions caused by increased depths of mining operations leads to greater expenses on mining useful minerals [7 – 9, 13, 26, 27], increased costs of opening new levels [10 – 12], stricter requirements to applied underground mining systems [12 – 16] and improvement of main and auxiliary underground mining operations [24, 29, 31 – 37] that impact efficiency and safety of the applied technologies. Deepening of mining operations results in increased rock pressure [26, 28, 30]. Fulfilment of these requirements leads to additional costs for efficient drilling and blasting operations (DBO) [23, 28]
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