Unplanned roof fall occurred at 6:00 AM on 9/27/08 in B-Mains section. Fall is located 40' inby Station No. 1735 in #1 Entry of B-Mains. Area is used as an intake airway. Fall is 80'L & at least 6' above coal seam. Area was supported w/6' fully grouted resin bolts & 10' cable bolts. All approaches were timbered off. Ventilation was not interrupted. No escapeways involved.