EE WAS CLEANING MATERIAL OFF A CATWALK THE MATERIAL WAS 8"" TO 12"" ROCK THAT HAD BEEN SPILLED OVER ONTO THE CATWALK, BY THE DISCHARGE CHUTE STOPPING UP. THE EE HAD MOVE A ROCK WHEN ANOTHER ROCK MOVED CATCHING EE S FINGER IN BETWEEN BOTH ROCKS. SMASHING HIS RIGHT MIDDLE FINGER.