A ROOF FALL WAS FOUND BY THE FOREMAN IN THE EAST MAINS AT XC #17 IN #3 ENTRY. IT MEASURED APPROXIMATELY 50' X 20' X 6'. THE AREA WAS MINED IN MAY 2000 AND WAS SUPPORTED WITH 6' TENSION REBAR B OLTS AND TIMBERS. FALL WAS CAUSED BY AN UNDETECTED SLIP IN THE MINE ROOF.