INDIVIDUAL HAD JUST GOT OUT OF UNDERGROUND TRUCK AND STARTED TO WALK TOWARDS FACE AREA, SLIPPED ON SOME ICE ON THE FROZEN MINE FLOOR AND TWISTED RT KNEE. INDIVIDUAL DID NOT SEEK TREATMENT UNTI L 12/10/03 WHEN KNEE BECAME VERY SWOLLEN. DOCTOR TREATED SWELLING WITH MEDICATION AND KEPT OFF WORK 5 DAYS.