Mining method for steep narrow vein tungsten ore body with unstable surrounding rock

Abstract

The invention discloses a mining method for a steep narrow vein tungsten ore body with an unstable surrounding rock. A mining preparation cutting engineering structure adopted by the static shrinkagemethod is used, and a layered propulsion manner from bottom to top is adopted, and the layering height is 1.6-2.2 m. The following steps of hole drilling, charge blasting, stope ventilation and localore removal from an ore chute are included, and the above steps are cyclically performed; after stope room backstopping ends, tunneling of a filling shaft in a stope jack-prop is performed; final oredrawing is organized; and the filling shaft is filled with barren rock. Compared with the prior art, when the mining method is used for local ore removal, a shrinkage pile is kept static and immobile,the effect of a filling body is achieved, a good supporting effect can be achieved on a crumbly strata of the hanging side, deforming damage and falling of the crumbly strata of the hanging side is prevented, and conditions are created for smooth upper mining of a stope room; and ore of a shrinkage stope closes the exposed faces of the hanging and heading side rock, clay minerals such as kaolin and montmorillonite are prevented from making contact with air and water, the weathering speed of the clay minerals is slowed down, and the stability of the rock mass is maintained.

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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