AN UNINTENTIONAL ROOF FALL WAS DISCOVERED BY A MINE EXAMINER (MAKING MINE AFTER 2 DAY FAN CHANGE OUT PERIOD) ON 4 NORTH MAINS TRACKWAY BETWEEN BREAK 30 & 31. THE APPROXIMATE DIMENSIONS WERE 12 FT WIDE X 100 FT LONG X 4 - 6 FT HIGH. THE FALL HAS BEEN CLEANED UP. NO INJURIES OR EQUIPMENT DAMAGE INVOLVED.