Examiner on weekly examination of worked out area discovered area had heaved and caved since last examination. The area inby cannot be safely examined. The roof in this area had been supported with FG 4-foot resin bolts with 8"" x 8"" plates. Cable bolts (12' long)also installed in this area. Cave = 500' x 18' x unknown height). Area outby cave cribbed to prevent extension.