EE WAS PATCHING HOLES IN BETWEEN FIBER BLOCKS OF THE FRAME FOR AN AIRLOCK DOOR ALONG 28 WEST TMLR. A PIECE OF MATERIAL FROM THE BLOCKS FLEW INTO HIS LEFT EYE. THERE WAS NO DAMAGE OR IMPAIRMENT TO THE MINING OPERATION OR MINING EQUIPMENT. THE INJURY DID NOT INVOLVE COMPLIANCE, JOB SKILLS, PROFICIENCY, TRAINING OR ATTITUDE. EE WAS WEARING SAFETY GLASSES.