Where the development system using the flank shaft, the ventilation system is diagonal, which simplifies the ventilation system, and the air volume distribution and ventilation management are also convenient. For the reasons mentioned above, most of the small mines have adopted the flank shaft development plan. If a Gold Mine of Shandong Province, ore 40º angle, thickness 8 ~ 14m, ore body length of 400m, the upper inclined plate adopts the development plan, the design depth from + 5 ~ -120m. Later, the deep ore grade was found to be high, and the ore body was generally thickened, and the geological reserves soared. Therefore, in the second phase, the design capacity increased from 150t/d to 250t/d; the middle height increased from 25m to 30m. A diagonal ventilation system was adopted, which was changed from the original return air wells (9, 7 in Figure 7-8) to a return air well 8. Thus, the second phase project saved the use of the flank shaft development plan. The main return to the wind well makes the construction schedule more reasonable.
In the shaft development of metal deposits, in addition to the development plan of the lower shaft, the flank shaft development application is more. Compared with the downhole shaft development scheme, this scheme has the following disadvantages: 1 Because the shaft is arranged on the side of the ore body, the underground transportation can only be one-way, so the transportation work is large; 2 the roadway excavation and recovery sequence is also one-way. The tunneling speed and the mining strength are limited.
The usual application conditions for this development plan are as follows:
(1) The length of the ore body is short, which is conducive to diagonal ventilation. For medium and small mines, when the length of the ore body is about 500m, it is reasonable to apply this scheme.
(2) The ore body is steeply inclined, and the ore body with no side or side angle is not developed by the flank shaft, which is shorter than the stone door of the up and down shaft development plan, as shown in Figure 7-7 and Figure 7-8.
(3) The topography and surrounding rock conditions of the upper and lower plates of the ore body are not conducive to the arrangement of the wellbore, and the ore body has a suitable industrial site on the side of the ore body. At this time, the selection of the plant is on the same side, so that the underground transportation direction of the ore can be The surface direction is the same.
(4) The ore body is relatively thick, or the ore body is a thin ore body with a gentle slope and a large area. See Figure 7-9.
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