Efficient mechanical mining method for gently-inclined thin ore bodies

Abstract

The invention discloses an efficient mechanical mining method for gently-inclined thin ore bodies. The method includes steps: step one, tunneling a drilling roadway of a first layer of a first section; step two, cutting waste rock of a foot wall; step three, forming side collapse vertical grooves; step four, constructing fan-patterned blast holes; step five, laterally blasting to form a footwall compensation space; step six, blasting in upper fan-patterned blast holes for stoping; step seven, constructing a connection roadway of a second layer of the first connection; step eight, tunneling the drilling roadway while cutting the waste rock according to procedures of the step one and the step two; step nine, repeating the step one to the step eight, and continuing stoping of a next section until stoping of four sections is finished. By the efficient mechanical mining method, defects of a breast stoping method and an upward horizontal cut-and-fill stoping method are overcome, and reduction of labor cost, relief of work intensity and the like can be realized by efficient mechanical operations. Furthermore, the efficient mechanical mining method is especially applicable to mining of gently-inclined thin ore bodies with high values or rare precious metals.

Description

technical field [0001] The invention relates to the mining and construction technology of rare and valuable mineral resources, in particular to a mechanized and efficient mining method for gently inclined thin ore bodies. Background technique [0002] Gently inclined thin ore bodies generally refer to ore bodies with an inclination angle of 20° to 35° and a thickness of about 2 to 4m. This kind of ore body has the following problems in the mining process: ①The mining engineering is large, The recovery efficiency is low, and it is difficult to realize large-scale production; ②The angle of the ore body is slow, the shovel loading efficiency is low, and the ore handling is difficult; ③The mixing rate of waste rock in the lower wall is high, and the ore in the upper wall is easy to lose, and the ore dilution loss rate is relatively large. [0003] Most of the mining engineering practice shows that: the gently inclined thin ore body is generally mined by the comprehensive mining ...

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Problems solved by technology

[0002] Gently inclined thin ore bodies generally refer to ore bodies with an inclination angle of 20° to 35° and a thickness of about 2 to 4m. This kind of ore body has the following problems in the mining process: ①The mining engineering is large, The recovery efficiency is low, and it is difficult to achieve large-scale production; ②The angle of the ore body is slow, the shovel loading efficiency is low, and the ore handling is difficult; ③The mixing rate of waste rock in the lower wall is high, and the ore in the upper wall is easy to lose, and the ore dilution loss rate is relatively large

[0003] Most of the mining engineering practice shows that: the gently inclined thin ore body is generally mined by the comprehensive mining method and the upward horizontal layered filling mining method. The comprehensive mining method belongs to the open-field mining method. The post-mined-out area is difficult to deal with, the ground pressure management is difficult, and ground pressure accidents occur frequently, such as: goaf collapse, surface subsidence, etc.; the upward horizontal layered filling method uses air-leg rock drills, which is labor-intensive , the recovery efficiency is low, and in the mining process of three layers in each segment, the amount of topping work in the construction of the connecting road is relatively large, that is, the mining-cutting ratio is large, and at the same time, the volume of waste rock transfer is large, the ore in the upper and lower plates is easy to be diluted, and the loss is also large ; These two mining methods often cause great economic losses for ore bodies with high mining value, which is not conducive to the recovery of resource benefits

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