A ROOF FALL OCCURRED IN THE NO.1 RETURN ENTRY APPROXIMATELY 140' OUT OF THE FACE ON THE 002-0 ""R"" SECTION. THE FALL MEASURED APPROXIMATELY 100' LONG X 18' WIDE X 8' THICK. THE AREA WAS KNOWN TO HAVE SOME ADVERSE CONDITIONS AND THE AREA HAD BEEN NARROWED TO 16' WITH CRIBS ON ONE SIDE AND 10' CABLE BOLTS INSTALLED IN THE INTERSECTION.