Comprehensive assessment of the mined coal quality and mining conditions in the Western Donbas minesDmytro Malashkevych, Serhii Poimanov, Serhii Shypunov and Mykola YerisovE3S Web Conf., 201 (2020) 01013DOI: https://doi.org/10.1051/e3sconf/202020101013