What is the thickest coal seam in Shanxi?

The thickest coal seam in Shanxi is 100 m.

Datong coalfield: a multi-stage coalfield in the northern part of North China coal-accumulating area. It is located in the north of Shanxi Province, spanning five cities and counties such as Datong, Huairen, Yin Shan, Zuoyun and Youyu. The plane is oval with an area of 1828km2. It mainly produces high-quality thermal coal, and is the location of Tongmei Group, the largest coal producer in China.

Datong coalfield is a NE-trending syncline tectonic basin, and part of its surface is covered by Tertiary and Quaternary. The axis of syncline is Yungang Formation of Middle Jurassic (J 1t), and the wing strata include Datong Formation of Early Jurassic (J2y), Upper Shihezi Formation of Late Permian, Lower Shihezi Formation of Early Permian, Shanxi Formation, Late Carboniferous Taiyuan Formation, benxi formation C0, Ordovician and Cambrian.

The northwest wing of syncline is gentle, and the dip angle is less than 10 degree, while the southeast wing is slightly steep, with a general dip angle of about 20 degrees. The near edge of syncline is affected by the south dip reverse fault, and there are secondary small-scale wide and gentle folds in syncline, and small and medium faults are not developed. In the area of Emeikou and Weijiadi in the southeast, there are Yanshanian small lamprophyres invading Carboniferous and Permian.

Mining geological conditions

Early Jurassic coal seam in Datong coalfield is shallow buried, with slow dip angle and few faults. Most coal seams are medium-thick coal seams, and the underground mining conditions are good, but there are also the following problems.

1, the roof of coal seam is generally thick layered sandstone, which has high compressive and tensile strength and is not easy to fall. When the roof weighting in goaf is heavy, the sudden collapse of hard roof in a large area will cause serious disasters.

2. The lack of groundwater and surface water in coalfield seriously affects the water supply in mining area; Mine hydrogeological conditions are simple, but a large amount of ancient kiln water poses a great threat to mining.

3. Although the gas content in mines in the south is low, it is high in the north. The northern part of Xinzhouyao Mine belongs to high gas mine, which is in danger of gas outburst.

4. Spontaneous combustion of coal seam is common. The development of Carboniferous-Permian coal seams in Datong coalfield is limited to the shallow part. In addition to simple roof management, the management of gas, spontaneous combustion of coal seam and floor is more complicated than the mining of early Jurassic coal seam.