A roof fall occurred on the perimeter entry South G Bleeder between #2 & #3 xcut. Fell above anchorage of 6' fully grouted roof bolts; rib to rib unkown lenght due to other end being inaccessable. No persons or equipment injured or trapped. Travel to #5 & #9 B.E.S. is impeede. Good air flow over fall. Main bleeder regulator same.