一、概 述我队于1981年6月进入某钼矿区进行勘探，除82年使用大口径钢粒钻进外，都使用金刚石钻进。钻孔多数处在女儿河大断裂带内，主要岩石有砂砾岩、燧石条带灰岩、硅质角砾岩、细粒二长花岗岩、花岗闪长玢岩、花岗斑岩等。岩石矿物颗粒粗大、结构疏松、节理及片理发育、蚀变较强，岩层变化大，软硬换层频繁，钻孔经常出现坍塌、掉块、溶洞、漏 I. Overview Our team entered a molybdenum mining area for exploration in June 1981 and used diamond drilling except for drilling with large diameter steel balls in 1982. Most of the boreholes are located in the daughter river fault zone. The main rocks are glutenite, chert limestone, siliceous breccia, fine-grained granite, granodiorite porphyrite and granite porphyry. Rock minerals coarse particles, loose structure, the development of joints and the film management, strong alteration, changes in rock formations, hard and soft layer frequently, frequent collapse of the borehole, block, cave, leakage