A ROOF FALL OCCURRED IN THE 13TH EAST, #5 ENTRY, #121 CROSSCUT. THE FALL WAS 20' LONG, 20' WIDE, AND 8' HIGH. THE FALL DIDN'T AFFECT TRAVEL, VENTILATION, OR CAUSE ANY INJURY. IT DID DAMAGE A SUPPLY TRAILER. THE AREA WAS BOLTED WITH 6' AND 8' POINT ANCHOR BOLTS.