Unintentional roof fall occurred in the B-1 1RIT 3LIT 1LIT room section. Section was idle when all occurred. Fall occurred in the x-cut 2-1 room 1 x-cut inby sta #8579. The fall was 95' length x 19' wide x 6-8'thick no exscapeways, equipment or people were involved. The area was supported with 4' full grouted roof bolts. All area were timbered and the area abandoned.