Shaft development scheme through the ore body
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The development plan for the shaft passing through the ore body is shown in Figure 7-4 . The advantage of this method is that the length of the stone gate is short, and the third-level minerals are submitted faster during the infrastructure construction; the disadvantage is that in order to maintain the shaft, a security pillar must be left. This approach is seldom used in rare metals and precious metals deposits, because the security pillar of the wellbore was too often considerable. In the production process, when preparing the mining plan and the statistics of the third-grade ore, this part of the ore is generally to be deducted. It is possible to carry out the recovery at the end of the mine production, and special measures are taken, which not only increases the mining cost, but also recovers. The rate is extremely low. Therefore, the application of this scheme is limited, and can only be used when the inclination of the ore body is small (generally around 20o ), the thickness is small, the distribution is wide, or the ore value is low.