赣东北大队一○二分队施工的某矿区，位于多种构造体系的交接部位，岩层挤压破碎，压扭性断裂较多，陡立片理发育。主要岩石有变质沉凝灰岩、千枚岩、凝灰质千枚岩以及变质细粒闪长岩和花岗闪长斑岩。岩石可钻性一般七至八级，部分九级。钻孔设计深度多为一千米，部分钻孔使用泥浆作业。 A mining area under the construction of the 102th Detachment of the Northeast Jiangxi unit was located at the junction of various tectonic systems. The rock formations were crushed and crushed with more compressive-torsional fractures and developed steeply and vertically. The main rocks are metamorphic sedimentary tuff, phyllite, tuffaceous phyllite and metamorphic fine diorite and granodiorite porphyry. Rock drillability is generally seven to eight, some nine. Drilling design depth of more than one kilometer, part of the drilling using mud operations.