6-l coal seam: located in the middl

6-l coal seam: located in the middle of the second coal-bearing section, it is mostly recoverable unstable coal seam with a thickness of o ~ 2.54 m and an average of 0.95m m. Non-exploitable areas are mainly distributed below -730m west of line 13 and between line 10 west and line 13 in NE direction. The structure is simple, occasionally containing 1 ~ 2 layers of dirt band, and the lithology is carbonaceous mudstone. The roof of coal seam is sandy mudstone, and the floor is mudstone and siltstone.5-2 coal seam: located in the middle of the second coal-bearing section, it is a relatively stable coal seam that can be mined in the whole region. The thickness is 0 ~ 10.13m, with an average of 2.66m Line 9 has a small range of non-mining areas between-700 m and-800 m. There are three small-scale magmatic erosion areas at the northwest end of the area. Affected by magmatic intrusion, a few drilled coal seams have degenerated into natural coke. The structure is complex. In 217 normal coal-mining sites, 82 sites contain 1 layer of dirt band and 21 sites contain 2-3 layers of dirt band. The lithology is mainly carbonaceous mudstone and mudstone. The roof of coal seam is sandy mudstone and siltstone, a small amount of medium-fine sandstone, and the floor is sandy mudstone and mudstone.4-2 coal seam: located in the middle of the second coal-bearing section, it is a relatively stable coal seam that is mostly recoverable. The thickness is 0 ~ 6.58 m, with an average of 1.45m m. Non-mining areas are mainly located below-800 m. Magmatic rocks intruded into the northwest end of the area and metamorphosed into natural coke. The swallowing erosion area is mainly located above -800m west of Line 13. For most minable coal seam. The structure is simple, a few points contain 1 layer of dirt band, some 2 layers of dirt band, and the lithology is mudstone and carbonaceous mudstone. The roof of coal seam is interbedded with sandstone and mudstone and siltstone, while the floor is siltstone.4-l coal seam: located in the middle of the second coal-bearing section, it is a relatively stable coal seam that is mostly recoverable. The thickness is 0 ~ 7.92m, with an average of 3.63m There is a magma erosion area in the west of the 13th line at the northwest end. Affected by this area, a few coal seams have degenerated into natural coke. For most minable coal seam. The structure is simple, a few of them contain a layer of dirt band, and the lithology is mudstone. The roof of coal seam is interbedded with siltstone and sandstone and mudstone, while the floor is mudstone.