Zhironkin S.(Institute of Trade and Economy, Siberian Federal University, 79 Svobodny av, Krasnoyarsk, 660041, Russian Federation, School of Core Engineering Education, National Research Tomsk Polytechnic University, 30 Lenina st., Tomsk, 634050, Russian Federation, Open Pit Mining Department, T.F. Gorbachev Kuzbass State Technical University, 28 Vesennya St., Kemerovo, 650000, Russian Federation)
Cehlár M.(Institute of Trade and Economy, Siberian Federal University, 79 Svobodny av, Krasnoyarsk, 660041, Russian Federation, Institute of Earth Sources, Faculty of Mining, Ecology, Process Technologies and Geotechnology, Technical University of Košice, Letná 9, Košice, 040 01, Slovakia)