AN UNINTENTIONAL ROOF FALL OCCURRED ON THE UNIT 1 WORKING SECTION ENTRY #1 AT THE +2220 FOOT MARK. THE FALL OCCURRED DUE TO ADVERSE ROOF CONDIT IONS CAUSING THE STRATA TO BREAK AT AND ABOVE TH E ANCHOR POINT. THE AREA WAS SUPPORTED WITH 5'& 6' CONVENTIONAL TYPE ROOF BOLTS. THE FALL WAS 8 1/2' X 25' X 25'. THE FALL WILL BE CLEANED UP AND SUPPORTED.