INJURED AND OTHER EE WERE REPLACING TROUGH ROLLERS ON THE SAG MILL FEED BELT. EE WAS ON THE EAST SIDE OF THE BELT. THEY WERE REMOVING A WORN ROLLER ASSENBLY, THE BELT HAD LIFTED WITH COME-A-LO NG. WHEN THE WORN ROLLER WAS TIPPED OVER INJURED'S RIGHT INDEX FINGER WA CAUGHT BETWEEN THE BELT ROLLER ASSEMBLY AND THE BELT FRAME WORK.