AT APPROX 9 AM ON 4/1/00, SMOKE WAS OBSERVED AROUND THE ""C"" TOWER AREA IN OUR UNDERGROUND CRUSHER. ALL EMPLOYEES WERE EVACUATED AND WERE OUT OF THE MINE BY 9:30 AM. OCI MINE RESCUE TEAM ENTERE D THE MINE AND EXTINGUISHED THE FIRE THAT WAS LOCATED ON THE C-1 BELT.