ROOF FALL AT 1 MAIN B TRACK AT 146 X-CUT; IT MEASURES 20'W, 20'L, 8'H, DOMED. A CLAY VEIN RAN HORIZONTALLY ACROSS INTERSECTION. THE AREA HAD BEEN MINED 12/69 WITH A CONTINUOUS MINER AND SUPP ORTED WITH 6' CONVENTIONAL ROOF BOLTS. OVER TIME, 7' AND 10' POINT ANCHOR BOLTS HAD BEEN INSTALLED RANDOMLY TO REPLACE OLDER BOLTS WHICH BECAME DISLODGED.