When the upper geological data is clear and the ore body shape is steeply inclined, it is reasonable to use the shaft to develop in the upper part. Once the deep geological data is obtained, and the dip angle of the deep ore body is slowed down, the blind inclined well development plan can be adopted in the deep, such as Figure 7-18 shows. In this way, the first-stage project (upper shaft part) and the deep development project (the lower part of the blind inclined shaft part can be compressed to the maximum extent, shortening the construction time, and making the development plan more economically reasonable. 
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