EE STATES THAT HE & (2) TWO CO-WORKERS WERE ATTEMPTING TO FREE A WEDGED CONVEYOR CHAIN ON A CONTINUOUS MINER WITH A SLEDGE HAMMER & BAR. THE BAR WHICH THE INJURED WAS HOLDING SLID UNDER THE CH AIN & THE INJURED'S LEFT HAND WAS CAUGHT BETWEEN THE FRAME OF THE MINER AND THE BAR.