AN UNINTENTIONAL ROOF FALL OCCURRED AT THE MILLENNIUM PORTAL 4N HEADGATE SET UP ROOMS AT 6056 NORTH 75 WEST ENTRY #1. THE FALL WAS APPROXIMATELY 50' LONG, APPROXIMATELY 20' WIDE AND APPROXIMAT ELY 10' THICK. THE FALL DID NOT AFFECT VENTILATION OR PASSAGE OF MINERS. THE FALL WILL BE CLEANED UP. FALL #21C.