Employee was coming through a door at 8 South #1 Belt Drive out to the track, when EE hit the brim of hard hat on a fire tap, causing EE to fall backwards causing discomfort in EE's back and a sprain/strain injury to EE's head/neck area. Cause of injury was awareness. Compliance with rules/regs, PPE, mining equip/systems not a factor. Miner proficiency may be a factor.