AFTER PUTTING HYDRAULIC OIL IN THE SECTION ROOF BOLTER, THE EE WAS WALKING AROUND MACHINE, THE MINE FLOOR WAS WET, SLIPPERY AND UNEVEN. THE EE SLIPPED, HE FELT PAIN IN HIS RT. KNEE. NOTE: EE CONTINUED TO WORK UNTIL 4/3/03 WHEN HE FIRST SOUGHT MEDICAL ATTENTION.