Two employees were aligning a head pulley with a tail pulley on a vertical leg/bucket conveyor. The injured employee was measuring the distance from the tail pulley to the plumbing string at the lower level when he was struck by a 2x2x6 angle iron weighing approximately 14.64 lbs. that came loose while the coworker, 130 feet above, was repositioning it. The angle iron fractured and severely lacerated his lower right leg, requiring hospitalization and surgery.