Maintenance of reusable mine workings during the augering mining of coal seams Volodymyr Bondarenko, Hennadii Symanovych, Iryna Kovalevska and Viktor Chervatiuk E3S Web Conf., 60 (2018) 00001 Published online: 16 October 2018 DOI: 10.1051/e3sconf/20186000001