27-29 Title WHAT CAN SERVE AS THE EXTRACTION COLUMN VERIFIED BOUNDARY, HOW CAN BE STOPE LIMIT DEFINED WITH FURTHER BREAK-DOWN CHAMBER FORMATION DOI: http://dx.doi.org/10.18796/0041-5790-2017-1-27-29 Authors Remezov А.V. <...> Gorbachev Kuzbass State Technical University (KuzSTU), Kemerovo, 650000, Russian Federation 2 “SUEK-Kuzbass”, JSC, Leninsk-Kuznetskiy, 652507, Russian Federation Authors’ Information Remezov А.V., Doctor of Engineering Sciences, “Mining Machines and Plants” Department Professor, e-mail: lion742@mail.ru Klimov V.V., Tunnelling Department Deputy Manager, e-mail: KlimovVV@suek.ru Abstract Based on the standard documents, during coal seam longwall retreating on strikes extraction protective pillar brow, left at the protecting pillar during break-down chamber formation, is considered to be the column boundary. <...> The latter falls within the abutment pressure zone, thus resulting in the further break-down chamber support disturbance, break-down works risks buildup, causing extra costs and production loss. <...> The paper suggests defining stope limit by instrumental measurements with further break-down chamber formation and equipment removal. <...> Keywords Coal mine, Stope, Break-down chamber formation, Stope equipment removal. <...> Ukazaniya po ratsional’nomu raspolozheniyu, ohrane i podderzhaniyu gornyh vyrabotok na ugol’nyh shahtah SSSR [Guidelines for efficient mine workings layout, protection and maintenance in the USSR coal mines]. <...> Ukazaniya po upravleniyu gornym davleniem v ochistnyh zaboyah pod (nad) tselikami i kraevymi chastyami pri razrabotke svity plastov moshchnost’yu do 3,5 m i s uglom padeniya do 35° [Guidelines for abutment pressure management in the stopes under (above) the pillar and selvedges during mining of 3.5 m thick series of strata with up to 35° inclination angle]. <...> Sovremennye vzglyady na sushchestvuyushchie tekhnologii <...>