Top and had been supported with 48"" glue bolts. Roof fall is approx. 14' thick, 60' long, 18' wide. Fall occurred in the intake air cause, between brks 2-3 of the #11 belt line. Ventilation checked inby the fall area, no change in ventilation. Note: mine has been in non-producing status since April 1, 2016. There is no active section at time of fall.