Low-section-height drift-pillar-free shrinkage-stoping, subsequent-filling and mining method

Abstract

The invention relates to a low-section-height drift-pillar-free shrinkage-stoping, subsequent-filling and mining method. According to a technical scheme, a transverse-drift roadway (7) is tunneled in a stage main haulage roadway (14) arranged at each stage to access a chamber to be stoped. A cross gateway (2) is arranged in a stud (6), and a ventilation way shaft (1) is communicated with the chamber by the cross gateway (2). Bottom-pulling height formed by cutting is 2 m-2.5 m and the width is equal to the thickness of an ore body. Stoping in the chamber is carried out from bottom to top, and layering height is 2m-3m. Length of a bench working surface is 2m-4m, height is 1.5m-2m, blast holes (10) are horizontally formed, and arranged in a triangular manner, and space between the adjacent blast holes (10) is 0.8m-1m; 30%-40% volume of ores are discharged after blasting and ore dropping each time, and all ores are discharged after stoping of the chamber is completed. An air return roadway built at the bottom of a mined-out area is distributed along the vein direction, and then the mined-out area is filled. The method has the advantages of being high in stope stability, high in ore recovery rate and high in mechanical degree.

Description

technical field [0001] The invention belongs to the field of underground mining of ore deposits, and in particular relates to a low-section high-pillar-free ore retention and subsequent filling mining method. Background technique [0002] In underground mining, there are often a few sporadic cystic and nest-shaped small ore bodies far away from the main ore body. From the perspective of technology and economy, traditional mining methods are not suitable for mining this part of ore. In order to consider the overall benefit, many mines These ores are all abandoned, resulting in a great waste of resources. In addition, in the process of delineating the mining boundary in open-pit mining, due to the complex occurrence conditions of the ore deposit and the large changes in the shape of the ore body, some ore bodies are often not within the mining boundary, and this part of the ore remains on the side of the open pit, that is, the hanging side mine. According to data, after the ...

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Problems solved by technology

[0006] When the caving method is directly used to mine hanging side mines, it is easy to cause problems such as caving of surrounding rocks in gobs, collapse of roof rocks, surface subsidence, and expansion of open pits; When using the open field method with reserved pillars to mine hanging side mines, due to the long exposure time and large exposed area of ​​the rock in the mining area, the stability of the surrounding rock will decrease, which will affect the safety of the mining area and the surface

At the same time, the ore body scale of open-pit side-side and hanging-side mines is usually small, and the ore loss and dilution of open-pit mining are relatively large, which is not conducive to small-scale hanging-side mining projects; the filling method of reserved ore pillars is used to mine hanging sides When mining, the filling method is complex in process and high in cost, and is not suitable for mining hanging side mines with a small amount of ore

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