EE STATED HE WAS OPERATING A NO.4 COAL HAULER ON THE SOUTH SECTION (MMU017-0) & WAS LOCATED ATTHE NO. 4 COAL HAULER BATTERY CHARGER STATION INTHE #7 NEUT ENTRY BEGINNING THE PROCESS OF CHANG INGBATTERIES HE STATEDF WHEN STEPPING FROM THE OPERATOR'S DECK HE ACCIDENTLY PLACED HIS RIGHT FOOT ON A NARROW PIECE OF WOOD LYING ON THE MINE FLOOR CAUSING HIM T TWIST & SPRAIN HIS ANKLE