A partition wall of a certain thickness is built in the roadway leading to the gob area, so that the air waves generated by the collapse of the empty area are buffered, so as to prevent the casualties and damages of people, roadways, etc. caused by the impact of the air. Sky, Mountain copper mine used this method.

(2) Applicable conditions of the closure method:

1 The ore and surrounding rock are extremely stable, the thickness and depth of the ore body are not large, the buried channel is not deep, and the mining period of the ore body is not long.

2 Buried is a deep area formed by scattered and isolated blind ore bodies. It is far away from the main ore body or the main production area, and no mining work is carried out in the lower part of the empty area.

(3) When using the closed space method, it should be noted that:

1 The partition wall of the masonry should be made of plastic materials (such as sand bags, etc.), and the brick wall can not be used. The length of the partition wall should not be less than 15 meters.

2 The surrounding rock must be allowed to collapse.

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