An unplanned Roof Fall occurred in the 1st West Pillar Section, in the #5 Entry - Intersection of crosscut #19 (Pillar Line). The fall is 20'x20'x 8' high. No miners were injured or entrapped. No ventilation was interrupted. 4-MRS units are inby the fall. Preliminary diagnoses; The Intersection was developed too wide which caused the strata to fail.