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施工矿区地层为白垩系神皇山组与戴家坪组紫红色粉砂质泥岩，粉砂岩、砂砾岩二者呈不整合断层接触，因断裂构造发育、硅化带穿插，石英脉及方解石脉呈洞裂粒状分布于岩石中，所以岩石硬、脆、碎，大部分孔段要采用钢粒反循环钻进，孔壁坍塌掉块，钻孔漏失，使用普遍泥浆，钻具经常中途遇阻下不到孔底，给钻探施工带来一定的困难。
The strata of the construction area are unconformable fault contact between the Cretaceous Shenhuangshan Formation and the Daijiaping Formation of purplish red silty mudstone, siltstone and glutenite. Due to the development of fault structure, intrusive silicification zone, quartz vein and calcite veins Crack-like distribution in the rock, so the rock hard, brittle, broken, most of the holes to be used to reverse the cycle of steel drilling, hole wall collapse blocks, drilling leakage, the use of universal mud, drilling tools often encounter obstacles halfway To the bottom of the hole, drilling construction to bring some difficulties.