A roof fall occurred on the D -1 section in the #1 entry 3 way intersection at 24 crosscut. the fall was approximately 20 feet long and 10 feet high. There were no injuries as a result of the fall. The area was dangered off and posts were set just outby fall area in the #1 entry and also set in the 1 - 2 entry. Ventilation and the escapeways were not effected by the fall.