Increases in the volume of ore loss in ore pillars as the mine deepens Shadiboy Hakimov, Olimjon Kobilov, Shukhrat Tadjiev and Sirojiddin Khamzayev E3S Web Conf., 417 (2023) 01003 Published online: 21 August 2023 DOI: 10.1051/e3sconf/202341701003