EE WAS OPERATING A 7LS JOY SHEARER CUTTING COAL,HE SAID HE STRUCK HIS HEAD AGAINST A SHIELD. CAUSE OF THIS INJURY WAS AWARENESS. COMPLIANCE WITH RULES/REGS NOT A FACTOR, PROTECTIVE EQUIPMENT W AS NOT A FACTOR, MINER PROFICIENCY A FACTOR, MINING EQUIPMENT/SYSTEMS MAY BE A FACTOR.