A roof fall occurred on the Main North Track at 23 X-cut, 26+20', #5 Entry. Fall was 30' long X 30' wide X 7' high. Area was mined in Oct of 88'. Fall occurred due to the immediate roof deteriorating around existing roof bolts. Area was supported with 8' and 10' expander shell roof bolts with a 2' resin anchor. Planks, header blocks and cribs were also used. Dangered off.