ROOF FALL IN ABANDONED 3 LEFT PANEL AT FACE INTERSECTION OF #6 ENTRY B-23. APPROX 19' WIDE AND 30' LONG, 8' HIGH. EXTENDS FROM IN BY B-22 #6 ENTRY TO FACE (THRU INTERSECTION) TO OLD FACE OF #6 ENTRY AT END OF PANEL. AREA POSITIONED ANDDANGERED OFF. DID NOT AFFECT VENTILATION.