The fire-boss was making a pre-shift examination across the faces of the No. 2 section. He encountered an unintentional roof fall between the 6 and 7 entry in the LOB. The fall was approximately 2 breaks inby SS# 15944. The fall measured to be around 52' in length, 18' in width, and 1' to 8' in height. All appropriate agencies were notified of the condition.