Thin and extremely thin ore body mining method

Abstract

The invention discloses a (thin and extremely thin ore body mining method) which is mainly used for mining a steep ore body. Hanging wall surrounding rocks of the steep ore body are unstable to moderately-stable and had better naturally collapse to form blocks, heading wall surrounding rocks of the steep ore body are moderately-stable, the ore body is extremely unstable or moderately-stable, a drilling drift is not supported, and a blast hole does not deform. The method is applicable to mining of an ore with regular morphology of the ore body, small thickness change, fewer horse-stones or no interlayer, no spontaneous combustion, no adhesion, collapsible grounds and surrounding rocks, obvious ore-rock boundary lines and complicated conditions. By the aid of a subsection caving method, mid-deep borehole drilling, pre-splitting blasting and reinforced concrete false roof laying is introduced, and actual mining is performed under a false roof (only by laying in a first sub-layer and generally in a middle roadway). The method has the advantages that safety of operators is good, ore block production capacity is high, mining equipment is simple, convenient to use and maintain and low inmining cost, and the mining method is used for mining a steep narrow vein with proper conditions with the development of a mining technology.

Description

technical field [0001] The invention belongs to the technical field of mining, in particular to a mining method for thin and extremely thin ore bodies. Background technique [0002] When the ore body is thin to very thin, and has cohesiveness, swelling and disintegration, and is extremely unstable; the surrounding rock joints and fissures are developed, and the stability is slightly better than that of the ore body, and there are obvious clay friction zones between the ore rocks When mining extremely difficult ore bodies, the commonly used mining methods have problems such as large dilution, large losses, low efficiency, low safety factor, and high cost, which cannot meet the needs of mining and seriously restrict the development of mines. There is a need for a corresponding mining method to solve the above problems. Contents of the invention [0003] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a...

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Problems solved by technology

[0002] When the ore body is thin to very thin, and has cohesiveness, swelling and disintegration, and is extremely unstable; the surrounding rock joints and fissures are developed, and the stability is slightly better than that of the ore body, and there are obvious clay friction zones between the ore rocks When mining extremely difficult ore bodies, the commonly used mining methods have problems such as large dilution, large losses, low efficiency, low safety factor, and high cost, which cannot meet the mining needs and seriously restrict the development of mines.

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