A 2-CUT PARTIAL PILLAR RECOVERY PLAN (RIGHT TO LEFT SEQUENCE) WAS BEING USED ON THE 1-EAST PANEL. THE 2ND CUT ON THE OUTBY END OF THE PILLAR WAS BEING MINED FROM THE NO. 5 ENTRY (1 BK. INBY 55 142) WHEN A ROCK MEASURING ABOUT 5' THICK FELL ACROSS THE RIPPER DRUM OF THE CONINUOUS MINER MACHINE FOULING SUCH MACHINE IN THE PLACE. A RETRIEVER WAS USED TO PULL THE MACHINE OUT.