C.M cutting #2 entry, they backed miner out to clean scrubber in #2 entry x-c9, while cleaning scrubber the top edges of along rib line started to dribble, men vacated the area and used the miner remote started backing miner out when middle of intersection fell on miner then gradually the entire intersection fell in on most of miner. Fall area 20' x 20' x 8 - 10' thick