EMPLOYEE WAS WATCHING CABLE TO CONTINUOUS MINER WHILE BOTTOM COAL WAS BEING CUT. INJURED PLACED LEFT HAND ON TOP OF BED OF SHUTTLE CAR WHILE HE REACHED DOWN TO MOVE MINER CABLE. MINER BOOM SWU NG OVER CATCHING FINGER BETWEEN BOOM AND SHUTTLECAR FRAME RESULTING IN AMPUTATION OF LEFT MIDDLE FINGER.