Room-and-pillar mining method

Abstract

The invention relates to a mining method, and specifically discloses a room-and-pillar mining method. Compared with the prior art, the major difference is that according to traditional room-and-pillar mining methods, minerals recovery is started after upward incising; according to the method, after cut-through through upward incising, advancing angle mining is conducted on the two sides from top to bottom of upward incising, mineral drive branches are formed, the corresponding mineral drive branches of adjacent chambers are interconnected, a vent channel is formed, and mined minerals are conveyed away; and the mineral drive branches are driven from top to bottom, the adjacent mineral drive branches are interconnected, ore pillars are reserved between the mineral drive branches, and chamber sill pillars are reserved in the positions close to hopper openings. The method has the advantages that (1) high safety guarantees are provided for ore deposit mining with poor stability; and (2) mining cross workload is reduced, and the mining recovery rate is increased.

Description

technical field [0001] The invention relates to a mining method, especially an open-field mining method. Background technique [0002] The room-and-pillar mining method is a kind of open-field mining method, which divides stages (slightly inclined and inclined deposits) or panels (horizontal and slightly inclined deposits) into several mine rooms and pillars. The mining work is carried out in the mine house, and the ore pillars are not recovered under normal circumstances. [0003] The advantages of the room-and-pillar mining method are small mining workload, high mining intensity, high labor productivity, low mining cost, and small ore dilution rate. Therefore, this method is most widely used in the United States, and the output accounts for 60% of the total mining volume of large and medium-sized non-coal mines. Some mercury ore, phosphate rock, antimony ore and clay mines in my country are also mined by room-and-pillar mining method. The typical steps of the existing ro...

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Problems solved by technology

[0008] However, the existing room-and-pillar mining method can only be used to mine ore deposits with stable surrounding rock and ore and a small inclination angle. The reason is that the existing room-and-pillar mining method starts to mine the ore after driving up the mountain, and the ore pillar is formed during mining. When using this method to mine unstable ore seams, since the excavation process will have a great impact on the ground pressure, in order to control the stability of the ground pressure, the distance between adjacent mine rooms is often designed to be relatively narrow (8m ~ 15m, which is not suitable for mining). Only 6m ~ 8m when the ore layer is stable)

Because if the distance between the mine rooms is too large, the impact on the ground pressure will increase during mining, and at the same time, a large empty field and exposed area will be generated after mining, which will pose a safety hazard; Affects adjacent mines and also affects the safety of mining work

Especially when mining the ore seam with poor stability and the surrounding rock of the roof and floor, the potential safety hazard will be greatly increased, threatening the life safety of the staff

Moreover, the existing room-and-pillar mining method has a large ore loss, which is not conducive to the rational utilization of resources

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