A safe and efficient mining method for steeply inclined double-layer ore bodies

Abstract

The invention discloses a safe and efficient mining method for a steeply-inclined and two-layer ore body. The mining method is particularly suitable for the stoping of the steeply-inclined and two-layer ore body of which ore rock is stable, of which a lower ore body >= 15 m in thickness, and of which an upper ore body >= 8 m in thickness. The mining method comprises the steps of firstly mining thelower ore body of which an ore block is arranged perpendicular to the run of the ore body, dividing the ore block into an ore chamber and an ore pillar to preform stoping in two steps, then mining the upper ore body of which an ore block is arranged along the run of the ore body, dividing the interior of the ore block into an ore chamber and a rib pillar, only mining the ore chamber, and leavingthe rib pillar for roof management and ground pressure control. The stoping of the upper ore body and the lower ore body are all adopt a level large-diameter deep hole for blasting mining; the caved ore is removed by a scraper in a bottom structure; and a goaf is filled afterwards. The safe and efficient mining method for the steeply-inclined and two-layer ore body has the advantages of safe operation, low ratio of preparation to cut, high production capacity of a stope, high efficiency, good ground pressure control effect and the like.

Description

technical field [0001] The invention belongs to the field of underground mining, and in particular relates to a safe and efficient mining method for steeply inclined double-layer ore bodies, which is especially suitable for steeply inclined double-layer ore bodies with stable ore rocks, a thickness of the lower ore body ≥ 15m, and a thickness of the upper ore body ≥ 8m. mining. Background technique [0002] When the ore body is produced in layers and the thickness of the rock interlayer between the upper and lower ore bodies is small, the difficulty of mining the ore body will be greatly increased at this time. [0003] If the upper and lower ore bodies, that is, the interlayer of interlayers, are considered as a complete ore body, that is, the interlayers are not removed, and the upper and lower ore bodies and interlayers are mined together. At this time, there is no mining sequence for the upper and lower ore bodies. There are mutual constraints and problems in engineerin...

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Problems solved by technology

[0003] If the upper and lower ore bodies, that is, the interlayer of interlayers, are considered as a complete ore body, that is, the interlayers are not removed, and the upper and lower ore bodies and interlayers are mined together. At this time, there is no mining sequence for the upper and lower ore bodies. There are mutual constraints and problems in engineering layout, but it is impossible to effectively remove rock inclusions. The mixing of a large amount of waste rocks will greatly increase ore dilution, reduce the ore grade, and affect the overall economic benefits of ore mining. If the upper and lower ore bodies are considered separately, it can be Effectively remove rocks and improve the ore grade, but at this time will face the problem of mutual restriction of the mining sequence of the double-layer ore body. If effective technical means and measures are not taken, the mining of one layer of ore body will destroy the other layer of ore body. Due to the mining environment of the ore body, it is difficult to recover another layer of ore body or cause large losses and dilution. In addition, it is difficult to arrange the mining and cutting engineering of the upper and lower ore bodies. A feasible way is to arrange the upper and lower ore bodies separately The transportation roadway and the bottom ore structure can solve the problem of project layout and mining sequence, but this layout will increase a large number of mining projects on the hanging wall, and the upper and lower ore bodies are often not fully utilized when mining , leading to repeated layout of the quasi-cutting project, large amount of quasi-cutting engineering and high cost

[0004] For this reason, the present invention provides a safe and efficient mining method for a steeply inclined double-layer ore body, aiming at solving the problems encountered during mining of a steeply inclined double-layer ore body with a stable ore rock, a thickness of the lower ore body ≥ 15m, and a thickness of the upper layer of ore body ≥ 8m. The above-mentioned mining sequence restricts each other, and the mining and cutting engineering cannot be effectively and fully utilized, etc.

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