EE WAS CARRYING TOOLS OVER A FALL AREA IN AN AIRCOURSE TO PREPARE TO SET POSTS IN AN UNSUPPORTED AREA. HE STEPPED IN A HOLE AND TWISTED HIS KNEE. AWARENESS OF TRAVELWAY WAS A FACTOR. THERE WAS NO DAMAGE OR IMPAIRMENT TO THE MINING OPERATION OR THE MINING EQUIPMENT. THE INJURY DID NOT INVOLVE COMPLIANCE, PROFICIENCY, JOB SKILLS, TRAINING, ATTITUDE, PROTECTIVE ITEMS, OR PROTECTIVE DE