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我省羊草沟煤矿区地层属侏罗系上统沙河子组与自垩系下统营城子组。沙河子组地层零星出露于矿区南部，岩性为灰褐色砂砾岩和紫红色砂砾岩。营城子组地层在本区广泛分布，为主要含煤层。矿区岩石自上而下为第四系复盖层、砂砾岩、流纹岩、玄武岩、膨润土、泥页岩、煤、沸石等。其中第四系复盖层的黄土层和煤系地层均属水敏性地层，遇水变软，易崩解，造浆性强。破砾岩呈泥质砂砾状结构，为结触式胶结，岩石疏松，遇水变软，崩解，造浆。
The strata of the Yangcaogou coal mine in our province belong to the Upper Jurassic Shahezi Formation and the Lower Cretaceous Yingchengchengzi Formation. The Shahezi Formation sporadically sprouts in the southern part of the mine, with lithologic brownish brownish conglomerate and fuchsia sandy conglomerate. Yingchengzi Formation strata are widely distributed in this area as the main coal seam. Rock from top to bottom for the Quaternary caprock, glutenite, rhyolite, basalt, bentonite, shale, coal, zeolite and so on. Among them, the loess layer and coal series strata in the Quaternary overburden belong to the water-sensitive strata, which are softened by water and easily disintegrated, resulting in high slurryability. Broken conglomerate is a muddy gravel-like structure, for the contact-type cementing, loose rock, water softening, disintegration, making pulp.