AN UNINTENTIONAL ROOF FALL OCCURRED ON THE 002 MMU IN THE NO 8 ENTRY IMMEDIATELY OUTBY THE FACE. THE FALL MEASURED 70'L X 20' X 8' TO 11'THICK. NO INJURIES OR EQUIPMENT DAMAGE OCCURRED AS A RE SULT OF THE FALL. INSTALLED ROOF BOLTS WERE 5' COMBINATION BOLT. THE FALL AREA WAS BARRICADED AND ADDITIONAL SUPPORT (CRIBS) WERE SET AT ENTRANCES. THE FALL WILL NOT BE REHABILITATED.