An unintentional roof fall occurred approximately 2 breaks inby spad 16356 on the Low Gap Mains at 15 break along the old 8A belt conveyor in an adjacent entry. The area was supported with 48 inch fully grouted roof bolts. The fall measured 40ftL X 20FtW X 4ftH. All approaches to the fall have been supported. The fall will not be cleaned up.