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When using the in-diameter inclined well development scheme (Fig. 7-11 ), the inclined well is arranged in the ore body, and the inclined well is close to the position of the lower part of the ore body, and the inclination angle thereof is preferably the same as (or close to) the inclination angle of the ore body. The advantages of this development plan are: no need to dig into Shimen, short development time, and quick production; in the whole development project, at the same time, the by-produced ore is mined, and this by-product ore can offset part of the excavation cost; Helping to further explore. The disadvantages are: the ore body is irregularly inclined, especially the ore body is irregular, the wellbore is difficult to keep straight, which is not conducive to lifting and maintenance; in order to maintain the safety of the inclined shaft, a security pillar is required. Therefore, non-ferrous metal mining and precious metal mines, such programs not much use. Only those mines with abundant reserves and low ore value can be considered for use.