What are the characteristics of shaft development compared with inclined shaft development?

(1) Short capital construction time: Because the adit construction is simple and good, the excavation speed is much faster than that of the shaft or inclined shaft.

(2) Less capital investment: the excavation cost per unit length of adit is much lower than that of shaft, and the maintenance cost is also less. There is no bottom, the entrance facilities are simple, and the derrick upgrade machine room is set up to save investment costs.

(3) Low drainage cost: general gravity drainage.

(4) Low cost of rapid transportation: generally, electric locomotives are used in adits, and the transportation cost is much lower than that of shaft hoisting.

(5) Easy ventilation: Usually it can be naturally ventilated, and a fan can be added when it is difficult.

(6) Safe and reliable production: the adit has high transport capacity and good safety of transport personnel and goods.