EE WAS ATTEMPTING TO MOVE WHEN HE WENT TO TURN, HIS FOOT WAS STUCK IN THE MUD AND HE SPRAINED HIS KNEE. CAUSE OF INJURY WAS MUDDY CONDITIONS. COMPLAINCE WITH RULES/REG WAS NOT A FACTOR, PERSON NEL EQUIP WAS NOT A FACTOR, MINER PROFICIENCY MAYBE A FACTOR, MINING EQUIPMENT/SYSTEM NOT A FACTOR EE WORKED UNTIL 6-20-00.