WE HAD A FALL ON SECTION 002 IN THE LAST OPEN BREAK BETWEEN 1 & 2 ENTRIES OF 4TH NW SUBMAINS. IT MEASURED 35' L X 18' W X 6' THICK. NO EQUIPMENT OR PERSONNEL INVOLVED AND FALL WAS NOT IN AN ES CAPEWAY OR AIRWAY. FALL WILL NOT BE CLEANED UP. THIS FALL WAS INVESTIGATED BY BOTH STATE AND FEDERAL INSPECTORS.