EMPLOYEE ON TOP OF A BELT WINDER TAKING A PIECE OF GUARD FROM UNDER THE MAIN SOUTH 54 INCH BELT. GUARDING FRAME HIT CONTROL LEVER OF WINDER AND MOVED. EMPLOYEE FELL ONTO WINDER. HE DISLOCATED HIS ANKLE AND FRACTURED HIS LOWER LEG. THERE WASNO IMPAIRMENT TO THE MINING OPERATION OR EQUIPMENT.