ACCORDING TO EE, AT APPROX. 12:30PM A LARGE PIECE OF COAL BECAME WEDGED ON THE CONVEYOR, WHILE EE WAS ATTEMPTING TO FREE THE COAL HE EXPERIENCED A PULLING/STINGING SENSATION IN HIS LOWER BACK . HE DISCUSSED THIS WITH ASST. SAFETY DIRECTOR. WHO ADVISED HIM TO LEAVE THE MINE AND SEE HIS DRIMMEDIATELY. EE WORKED THE REMAINDER OF THE WEEKAND REPORTED OFF ON 1-14-02.