Andragogical Model in Language Training of Mining Specialists Evgeniya Bondareva, Galina Chistyakova, Yury Kleshevskyi, Sergey Sergeev and Aleksey Stepanov E3S Web Conf., 21 (2017) 04019 Published online: 10 November 2017 DOI: 10.1051/e3sconf/20172104019