During a weekly airway examination a roof fall was discovered in #4 entry 30 feet inby spad # 937 and extended 30 feet inby spad # 951. The fall is 20 feet wide approximately 40 feet long and 5 feet to 6 feet high. It is located approximately 20 cross-cuts outby the face and will not be cleaned up. Approaches are timbered and dangered off.