Synchronous mining shrinkage stoping method for double-layer mine variety inclined ore body

Abstract

The invention discloses a synchronous mining shrinkage stoping method for a double-layer mine variety inclined ore body. The method comprises the following four steps of 1 accurate mining, wherein a horizontal rock drift and a horizontal ore drift of a bottom plate are tunneled separately along the strike of a lower-layer mine variety, penetrate through an upper-layer mine variety by tunneling a cross drift and then enter a top plate, a horizontal rock drift and a horizontal ore drift of the top plate are tunneled separately along the strike of the lower-layer mine variety, an extracted ore drift is constructed every other a section of distance between the horizontal rock drifts and the horizontal ore drifts, and accurate mining raises are constructed in the horizontal ore drifts in the inclined direction of the ore body; 2 cutting, wherein connection roadways are constructed by being perpendicular to the accurate mining raises in the accurate mining raises every other a section of the distance; 3 stoping, wherein layered ore break by blasting is performed from bottom to top after undercutting of the horizontal ore drifts is finished; 4 ore drawing, wherein a carry-scraper performs ore drawing on a stope through the extracted ore drift. According to the synchronous mining shrinkage stoping method for the double-layer mine variety inclined ore body, synchronous stoping of the two mine varieties is achieved, the mining activity time is shortened, the bottom structure of a traditional shrinkage stoping method is eliminated and changed into a rock access ore drawing, the safety is reliable, and the ore recovery rate is increased.

Description

technical field [0001] The invention belongs to the technical field of mining of underground metal and nonmetal mines, and in particular relates to a method for synchronously mining a double-layer ore inclined ore body and retaining ore. Background technique [0002] The ore retention mining method is to divide the ore block into a mine room and an ore pillar. The mining room is first mined, and then the mining pillar is mined in layers from bottom to top in the mine room. Each time the ore mined is released by its own weight about one-third , and the rest are temporarily kept in the mine as a working platform for continued mining, and will be released after the mining operation in the mine is completed. The ore pillars are recovered and the mined-out area is processed after the mine recovery is completed. For the mining of single-layer ore, the effect is good, but for the mining of double-layer ore (single ore or double-layer ore), it is more difficult to mine. In general,...

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Problems solved by technology

[0003] Because the mining method of retaining ore mining usually has a large goaf after drawing ore, and after the upper layer mining is completed, it is easy to cause a large area of ​​the goaf to collapse. When the lower layer is mined again, the safety is poor, and the ore loss is large. Sometimes even because the gobs and interlayers of the upper strata have all collapsed, the mines in the lower strata cannot be exploited at last.

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