Smooth transition method for mining of last middle-section ore body in pillarless sublevel caving method

Abstract

The invention discloses a smooth transition method for mining of a last middle-section ore body in a pillarless sublevel caving method. The smooth transition method comprises the techniques that construction is conducted on a last middle-section of a slope ramp of an original mining area to form a development roadway penetrating through a middle-section transporting roadway; and then prospecting is conducted on the boundary of the footwall of the ore body to determine an outside-vein main roadway of the ore body, and thus projects such as mining and cutting of the ore body can be conducted. According to the smooth transition method, an original middle-section development system is mainly utilized, smooth transition of mining of the last middle-section ore body in the pillarless sublevel caving method can be ensured, and the problems such as production interruption of a mine, the low mining production efficiency and increasing of the mining production cost in the last middle-section conversion period in mining through the pillarless sublevel caving method can be solved; compared with a traditional production method, smooth transition of mining of the last middle-section ore body isrealized, the mining time of the mine is shortened, the mining production cost is reduced, and the mining production efficiency is improved; and only an auxiliary contact road project is additionallyarranged, the project quantity is small, most of the project is the mining and cutting project, and the smooth transition method has the characteristics of low construction difficulty, low mining cost, high efficiency and the like.

Description

technical field [0001] The invention relates to a mining method, in particular to a method for smooth mining transition in the last middle section of the ore body of the bottom-pillar subsection caving method. Background technique [0002] The mining method of large and medium-sized underground mines at home and abroad is mostly the sub-section caving method without pillars. This mining method generally adopts the development method of combining shafts and ramps. The mining sequence is divided into several mining middle sections from top to bottom. Divide multiple mining segments, and set multiple independent stope chutes in the middle section of the mine. Each stope chute is connected horizontally with each section in the middle section. The bottom level of the middle section is unloaded into the mine car through the vibrating ore feeding machine of the stope shaft. Generally, the bottom level of the middle section is used as the transportation level, and a rail transportat...

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Problems solved by technology

[0004] (1) The traditional production method: at the end of the middle transportation level ore body development, mining and cutting, cutting, mining and other work needs, after the completion of the sublevel mining above the middle transportation level, the rail transportation and mining within the middle transportation level The field power, lighting system and cables are all removed before it can be carried out, resulting in the interruption of underground mine production. During this period, only a small amount of by-product ore is supplied to the mine, the mining capacity of the stope drops sharply, and the mining cycle of the mine is extended.

[0005] (2) The production between the horizontal ore body in the final middle section and the mining of other sub-level ore bodies in this middle section is discontinuous, and the production is interrupted due to projects such as development, mining and cutting, and drilling of medium and deep holes, and the interruption period is at least 6 months. And the mining production capacity is low during the horizontal mining of the final mid-stage transportation, resulting in low production efficiency, low output, and increased mining production costs

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