EMPLOYEE AND PHELPS DODGE EMPLOYEE WENT TO THE SCRAP IRON PILE TO RETRIEVE SOME NOSE CONE CAPS THAT WERE DISCARDED BY PHELPS DODGE. HALF OF THE PIN THAT HAD BEEN CUT INTO AND THE CAP WERE FOUN D. THEY DRUG IT OVER TO THE PICK-UP TO LOAD IT IN THE TRUCK. THE PIN AND CAPS WERE PICKED UP BY HAND AT THE REAR OF THE TRUCK. WHILE STEPPING BACK, EE SLIPPED & THEY WERE DROPPED ON RIGHT LEG