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金川公司所属的龙首矿新１￣＃主井井筒延深工程量３１７ｍ，延深井筒穿过前震旦系白家咀子组粗粒片麻岩组和断层破碎带岩组，是极不稳定型地层，视围岩的松散、破碎程度和压力大小采取不同掘进方法；先采用喷锚网并圈背板联合支护，再用３５０ｍｍ厚的混凝土作二次支护。该井是煤炭系统首次在金属矿山施工的井筒，于１９９２－０６－０４竣工，全井平均月成井３９ｍ，工程质量优良，金川公司给予了高度评价。
Jinchuan company belongs to the first 1 ~ # main shaft mine shaft extension engineering volume of 317m, extending deep shaft through the former Sinian Baijiazuizi coarse gneiss group and fault fracture zone rock group is extremely unstable Type strata, depending on the loose rock mass, crushing degree and pressure to adopt different tunneling methods; first use of spray anchor network and the back plate joint support, and then 350mm thick concrete for secondary support. The well was the first coal shaft construction in the metal mine shaft, completed in 1992-06-04, the whole well average monthly well of 39m, the project of good quality, Jinchuan company spoke highly of.