EE WAS REMOVING LARGE PIECES OF TACONITE FROM THE WALKWAY OF THE #1 PRIMARY ORE CONVEYOR. AS SHE THREW A CHUNK IT CAME BACK AT HER STRAINING HER RIGHT SHOULDER. SHE DID NOT RESPOND TO CONSERVA TIVE TREATMENT & WAS TAKEN OFF WORK ON 2/20 FOR ARTHROSCOPY DEBRIDEMENT.