A ROCK HAD BECOME LODGED BETWEEN THE TOP AND BOTTOM BELT OF THE STOPE BELT. THE BELT WAS LOCKED OUT AND INJURED AND CO-WORKERS WERE USING A COME-A-LONG TO FREE THE ROCK. INJURED WAS ON THE OFF WALKWAY SIDE OF THE BELT USING A BAR TO LIFT THEROCK OVER THE BELT RAIL. ROCK TWISTED CAUSING THE BAR TO CATCH INJURED RIGHT INDEX FINGER BETWEEN BAR AND BELT RAIL.