During the weekly mine examination a roof fall was observed in an intersection located in the old 1-south sub-mains in No. 3 entry, one crosscut inby spad No. 3865. This is a non-active area of the mine. The fall measured approximately 18 feet wide by 40 long and 6 to 8 feet high. No travel blocked, no ventilation blocked and the fall will not be cleaned. Only breakers posts set.