Investigation and optimization of main materials consumption when mining iron ores at deep levels of the Underground Mine Group of the PJSC “ArcelorMittal Kryvyi Rih”Mykola Stupnik, Vsevolod Kalinichenko, Olena Kalinichenko and Sofiia YakovlievaE3S Web Conf., 201 (2020) 01026DOI: https://doi.org/10.1051/e3sconf/202020101026