ALLEGED INCIDENT WAS TO OCCURED WHILE THIS EE WAS WALKING ON AIR COURSE. HE CLAIMS TO HAVE SLIPPED STRIKING HIS KNEE ON A ROCK. CAUSE OF INJURY WAS AWARENESS & WALKWAY CONDITIONS. COMPLIANCE WITH RULES/REGS NOT A FACTOR. PROTECTIVE EQUIPMENENT NOT A FACTOR. MINER ATTITUTDE A FACTOR, MINING EQUIP/SYSTEMS NO A FACOTR