AN UNINTENTIONAL ROOF FALL WAS DISCOVERED IN THE INTAKE AIRWAY ON 3-1-00. TIME AND DATE OF FALL IS UNKNOWN. THE FALL MEASURED 20 FT LONG BY 10 FT WIDE BY 42 INCHES HIGH. ALL ENTRANCES HAVE BEE N BREAKERED OFF. LOCATION IS APPROX 9500 FT FROMTHE WORKING FACE.