EE WAS STEPPING DOWN OFF OF A TRACK FLAT CAR AND WHEN HIS FOOT TOUCHED THE MINE FLOOR HE TWISTED HIS ANKLE. CAUSE OF THIS INJURY WAS SAFETY AWARENESS. COMPLIANCE WITH RULES/REGS. WAS NOT A FACTOR, MINER ATTITUDE A FACTOR, PERSONNEL PROTECTIVE EQUIPMENT WAS NOT A FACTOR, MINING EQUIPMENT/SYSTEMS NOT A FACTOR.