EE WAS WALKING TOWARD THE TAIL WHEN HE HIT HIS HEAD ON THE FIRST AID BOX MOUNTED ON JACK 167. HE REPORTED THE INCIDENT TO HIS SUPERVISOR & FINISHED HIS SHIFT. ON 1/7/04 EE DIDN'T REPORT FOR HIS REGULARLY SCHEDULED SHIFT. MINE MANAGEMENT ATTEMPTED TO CONTACT HIM. EE WAS CONTACTED ON 1/9/04 & HE REPORTED THE FOLLOWING: DURING SCHEDULED DAYS OFF HE EXPERIENCED PAIN IN HIS NECK & B