EMPLOYEE WAS USING SLEDGE HAMMER TO DRIVE WHEEL ONTO ROOF BOLTER. HE HIT SIDE OF HWEEL AND FACE OF HAMMER GLANCED, CUASING HIS INDEX FINGE RON HIS RIGHT HAND TO BE CAUGHT BETWEEN THE WHEEL AN D HTE HAMMER HANDLE. FRACTURE TO END OF FINGR AND LACERATION. NORMAL WORK DAYS FRIDAY THROUGH MONDAY.