A ROOF FALL OCCURRED ON THE 009 SECTION BELT LINE APPROX. 1 1/2 HOURS AFTER THE 2ND SHIFT STARTED. FALL MEASURED 6'THICK BY 20'WIDE BY 30'LONG AT THE #10 X-CUT ON THE 6-B BELTLINE. APPROX. 25' OF CONVEYOR BELT & STRUCTURE WAS AFFECTED. NO PERSONNEL WAS INVOLVED.