An unintentional roof fall was discovered at approximately 10:15 a.m. at brk. 20, No.2 Hdg, on the Grassy Creek Mains. All approaches to the fall were timbered off. The fall did not interrupt ventilation and will not be cleaned up. The fall was approximately 8'-10' high, 20' wide, and approximately 60' long. The fall was in the intersection.