Unplanned Roof Fall at xc#52, #4 entry station #6835 on the Main North belt. Fall occurred in an intersection, 4-way supported with 8' T.R. bolts. Fall dimensions - 17' wide by 30' long and 10' high. Fall did not cause injury, impair ventilation or entrap miners. Fall area developed 4-25-2015. Reported to MSHA at 4:55 AM on 3-8-2017.