EMPLOYEE WAS SWEEPING DIRT OFF CATWALK OF LOADER. AS HE STEPPED FROM CATWALK TO ACCESS LADDER, HIS FOOT SLIPPED, CAUSING HIM TO FALL AND LAND ON THE GROUND. SUDDEN IMPACT CAUSED A SPRIAN OF LE FT KNEE. FIRST AID TREATMENT AND DIAGNOSIS WAS SUFFICIENT UNTIL NOV 21, 2001. A RETURN VISIT TO DOCTOR WAS NECESSARY.