EMPLOYEE WAS CARRYING A PIECE OF STEEL MONORAIL WHEN HE STEPPED ON A WATER PIPE; HIS FOOT SLIPPED AND HE FELL, STRAINING HIS LOWER BACK. THERE WAS NO DAMAGE OR IMPAIRMENT TO THE MINING OPERATION/EQUIPMENT. INJURY DIDN'T INVOLVE ANY ASPECT OF COMPLIANCE, JOB SKILLS, PROFICIENCY, TRAINING OR ATTITUDE, OR PROTECTIVE ITEMS.