ABSTRACT
The length of leading holes of diameter 130-250 mm during the excavation on a layer should be 1020 m and the number determined by the formula (Cai, Bondarenko & Isabek 2009; Cai, Issabekov et al. 2008)
mba S Sn 2 , (1)
where efS – area where the effective influence of drainage wells, m2; zoS – protected area (dangerous) areas disturbed by a pack of coal, m2, a – average width of the output on the bedding pack or packs of broken coal in the rough, m; b – width of the cavity of the treated wells array of disturbed coal the contour generation, m, nm – power pack or packs of broken coal, m.
