2. When the upper and lower adjacent middle sections are simultaneously harvested, the inclined length of the upper middle section mining working surface should be more than 20m ahead of the lower middle section.
Third, the mining work found that the top help is not stable, must take support measures, due to blasting or ground pressure to cause damage to the support, should be repaired in time to confirm the safety of the prospective operation.
4. Before the mining, the top plate and the two sets of pumice must be treated first, and the safety must be checked. In the operation, it is found that the warning is to be taken off, and the operation should be stopped, especially if there is a danger of a big roof, the operator should be notified immediately to leave the site.
5. If there is a goaf at the edge of the stope, the edge of the goaf shall be taken first. In case of a stope with broken roof and serious ground pressure, in addition to necessary support, it is necessary to speed up the mining process and minimize the mining. Field exposure time.
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