Nondestructive explosion mining method for underground gently-inclined thin-layered jade mine

Abstract

The invention discloses a nondestructive explosion mining method for an underground gently-inclined thin-layered jade mine. The method employs the manners of explosion and manual and mechanical operation and comprises the following concrete steps: reserving hanging-wall surrounding rock with a certain thickness above ores as a protection layer of the ores; perforating a rows of pre-splitting holes in the protection layer; and before stoping, blasting the pre-splitting holes to form a pre-splitting crack so as to reduce damage of explosive stress waves to the jade mine and realize safe and nondestructive mining of the jade mine. The method provided by the invention is simple to implement and has high security; and the mined jade ore has a regular shape, a great size, no damage and a high economic value.

Description

technical field [0001] The invention relates to a mining method, which is suitable for the mining of an underground gently inclined thin ore body, especially the safe, non-destructive and non-waste mining of an underground gently inclined thin layered jade mine. Background technique [0002] The non-destructive mining of underground thin-layered jade mines is one of the difficulties in mining engineering. At present, the mining method combined with manual and blasting represented by the wall cutting and filling method is commonly used. This type of method directly takes the stage transportation roadway as the free surface, and excavates and blasts in the inclined direction of the ore body. With the advancement of the working face, the goaf is filled with artificial masonry with larger block stones, and the roadway for transportation up the mountain is formed by masonry. Pre-select a layer of thicker and more stable slate as the direct roof, and control the distance between ...

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Problems solved by technology

[0003] (1) The mined jade mines are small in size and low in integrity, and the commercial value of jade is seriously reduced;

[0004] (2) The roadway is formed by masonry in the goaf, the cross-sectional size is small, and the safety is low, which is not conducive to the use of mechanical equipment. After blasting, blast smoke can easily enter the roadway from the goaf, which will affect the ventilation;

[0005] (3) Due to the thicker reserved thickness of the bottom plate, the amount of manual prying is large, which requires a lot of manpower and is extremely time-consuming; the work efficiency is low and the labor intensity is high

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