EE WAS TRIMMING A PIECE OF BELT WITH RAZOR KNIFE. KNIFE BLADE BROKE WHEN THE BLADE CONTACTED A BELT CLIP, STRIKING WRIST. CAUSE OF INJURY WAS IMPROPER USE AND BODY PLACEMENT OF ARM. COM[LIANCE WITH RULES/REGS NOT A FACTOR, MINER KNOWLEDGE A POSSIBLE FACTOR, PERSONNEL SAFETY EQUIP A FACTOR, MINING SYSTEMS A FACTOR.