UNINTENTIONAL ROOF FALL. FALL MEASURED 20' LONG X 18' WIDE X 40' HIGH. AREA MINED 2/22/06. NO INJURIES OR PROPERTY DAMAGE. ROOF PREVIOUSLY SUPPORTED WITH 6' TORQUE TENSION AND 6' DOUBLE LOCK BOLTS. ONLY ENTRANCE WAS DANGERED OFF AND BROW SUPPORTED WITH 3 CRIBS. FALL MOST LIKELY WILL NOT BE SUPPORTED OR CLEANED.