Coal seam 8: located at the upper p

Coal seam 8: located at the upper part of the second coal-bearing section, it is a relatively stable coal seam recoverable in the whole region. The thickness is 0 ~ 12.07 m, with an average of 3.05m m. Magmatic rock intrusion was found only in the holes of 15th 9th and 15th east 29th (9th). The coal seam swallowed thin and degenerated into natural coke, which is the basic recoverable coal seam in the whole region. The structure is relatively simple, with part containing 1 layer of dirt band, and some points containing 2-3 layers of dirt band, and the lithology is carbonaceous mudstone and mudstone. The roof of coal seam is sandy mudstone and medium-fine sandstone, while the floor is mudstone and sandy mudstone.7-1 coal seam: located at the upper part of the second coal-bearing section, it is mostly recoverable unstable coal seam. The thickness is 0-3.30m,