A roof fall was found out by the working section at 8+20 #5 to #7 entries of the 2nd west mains. Ventilation was disabled and then immediately reestablished by construction of new stoppings. It was originally supported with 6in resin bolts & secondarily supported with 10' cable bolts. Fall was 120'L, 18'W & 10'H. Upper block coal seam was cause.