EMPLOYEE WAS REMOVING MOUNTING BOLTS FOR RIGHT REAR WHEEL GROUP OF HAUL TRUCK #094. WHILE RUNNING THE IMPACT GUN WITH HIS RIGHT HAND USING HIS LEFT HAND TO STABLEIZE IT, HE PINCHED HIS LEFT PI NKY FINGER. MEDICAL TREATMENT WAS SOUGHT AND X-RAYS REVIEWED, A FRACTURE OF THE LEFT PINKY FINGER.