OPERATOR WAS USING A CATERPILLAR D9 DOZER TO PUSH COAL ON COAL PILE. HE HAD PUSHED A RAMP UP A FACE OF COAL TO CHECK CONDITION OF COAL AHEAD OF THE LOADING. WHEN HE CAME BACK OFF THE UPPER LEV EL OF THE STOCKPILE, HE MISSED THE RAMP & BROKE OVER THE FACE TO THE SIDE OF THE RAMP, STRAININGHIS NECK AS THE DOZER PITCHED DOWNARD ~ 8 1/2 FTCAUSING A JARRING MOTION.