A mining method for steeply inclined thin-vein tungsten ore body with unstable surrounding rock

Abstract

The invention discloses a method for mining tungsten ore bodies with unstable surrounding rocks and sharply inclined thin veins. The mining quasi-cutting engineering structure adopted by the static ore retention method is adopted, and the bottom-up layered advancement method is adopted. The layered height It is 1.6-2.2m, including the following steps: digging holes; explosive blasting; stope ventilation; partial ore extraction from the mine shaft; the above steps are carried out in a cycle. Organize the final ore drawing; fill the waste rock in the filling well. Compared with the prior art, the present invention keeps the ore heap still when the ore is extracted locally, and plays the role of filling body, which can play a good role in supporting the broken rock formation on the hanging wall, preventing its deformation, damage and damage. The falling off creates conditions for the smooth mining of the mine house; moreover, the ore retained in the stope seals the exposed surface of the upper and lower wall rocks, prevents clay minerals such as kaolin and montmorillonite from contacting with air and water, slows down their weathering speed, and maintains rock mass stability.

Description

technical field [0001] The invention relates to the technical field of ore body mining, in particular to a method for mining tungsten ore bodies with unstable surrounding rocks and steeply inclined thin-vein tungsten ore bodies. Background technique [0002] The main mining method of steeply inclined thin-vein tungsten ore bodies is the ordinary shallow hole retention method. However, when the surrounding rock is not stable, large-scale slabs and roof collapse often occur during the mining process of the stope, resulting in the stope being forced to stop mining. , or even if it is mined to the design height, the ore mined cannot be fully released due to the massive caving of surrounding rocks, resulting in a great waste of mineral resources and a major threat to safe production. At present, for the mining of this kind of ore body, the measures taken by the mining area are to leave irregular ore pillars to support the surrounding rocks of the upper and lower walls, so as to m...

AI Technical Summary

Problems solved by technology

[0006] ④ The flaky surrounding rocks are mixed into the ore, resulting in the dilution of the ore. Large pieces of flaky surrounding rocks also block the ore-drawing funnel, so that the mined ore cannot be released, resulting in a large loss of resources;

[0007] ⑤ In order to protect the stability of the stope, some ore pillars are often left in the stope to support the upper and lower walls of the surrounding rock, causing a large amount of ore loss and seriously affecting the mine production and the economic benefits of the enterprise. Leaving ore pillars in the field will also cause construction inconvenience and affect the final mining of the stope

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