An unplanned roof fall was found in an area where persons do not regularly work or travel. Between break #4 & break #5 of 1st NW Panel in #2 entry (spad #851 appr. 60' inby fall). Fall was appr. 70'L x 19'W x 12 to 14'H. No injuries or entrapment involved. No ventilation, escapeway, walkway or equipment involved. Fall will not be cleaned up, will be breakered & dangered off.