An unplanned roof fall occured 1 Bk. inby spad 304, # 3 entry adjacent to Glory Hole # 1 belt. Fall was 6000 ft from the face. Fall measured 20 ft length, 20 ft wide and 5 ft high. Roof was supported with 48 in resin bolts. Mixed stratam no coal rider seam present. Fall was breakered off, not rehabilitated. WVOMSA inspector discovered fall while checking belts.