A roof fall occurred in XC #21 between entry #1 and entry #2 of the 1st main north off the 2nd main west, unit #6 MMU-067-O, spad #12+64. the fall was from the edge of the XC in entry #1 and measured 35' toward entry #2. The fall was the width of the XC, 19' x 8'H. there was no equipment involved, no injuries, and no disruptions to travel or ventilation.