AN AREA OF APPROX 4'-5'X18'WX80'L FELL 10,000 FEET OUTBY THE ACTIVE SECTION ON THE 8 LEFT PANEL. THE FALL WAS LOCATED IN THE #7 MAIN THRU THE CROSSCUT TO THE #8 MAIN (CROSS CUT #83). 4' FULL Y GROUTED BOLTS HAD BEEN USED. IT APPEARS THAT AN AREA OF SLICKENSIDE ROOF WAS THE CAUSE OF THE FALL.