What is Zhangba Coal?

For a long time, 9#, 10# and 1 1# coal seams have been commonly called "Zhangba Coal" by ordinary people and coal industry. The shaft of No.3 Mine originated from Zhangba coal, that is, the underground coal seam is 10 foot thick, and it should be excavated in three layers. This is the main shaft and the auxiliary shaft, one for transporting people and the other for transporting coal. The slogan of "knowledge, innovation, science and preciseness" is full of dust.