This kind of development scheme is generally applicable to small mines where the inclination of the ore body is slow, and it extends long in the oblique direction, or the geological reserves are not large and the production capacity is not large. In small mines, due to various conditions, the specifications of mining equipment (including mine lifting equipment) should be small and unsuitable, which will bring inconvenience to mining deep ore bodies. If the inclination of the ore body is slowed, the deep inclined development can use the same inclined well as the upper part, and the deep shape of the "Z" will be reduced. In fact, this kind of practice is economically unreasonable: first, the maintenance cost of the inclined well is higher, but the improvement ability is lower; secondly, this will result in a multi-(section) upgrade, which will increase the number of auxiliary production personnel. The underground workshop management fee is increased, which increases the mine cost. At the same time, because of the large number of equipment, the production process, and the high incidence of equipment accidents, this increases the difficulty in production management. If a gold mine is due to the above reasons it decided to adopt a joint development plan of deep blind shaft.
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