Mining method of thin minor ore body

Abstract

The invention discloses a mining method of a thin minor ore body, which comprises the steps of ore recovery and goaf filling, which are alternatively circularly performed from bottom to top in a horizontal layering manner, propelling is performed along with a work surface, lime, loess, dead rock and the like are adopted and mixed layer by layer to fill a goaf, a filling body supports hanging wall and heading wall surrounding rocks, and serves as a work platform of upper layering recovery and ore removal, the ore is conveyed to an ore chute with a mechanical method, spallation ore removal of each recovery spallation step length and the filling procedure of the goaf are performed alternatively, when the uppermost horizontal layer of a chamber is recovered, mechanical and manual fill tightening are performed. The method solves the problem of discharge of tunneled dead rocks, effectively processes the goaf, prevents surface subsidence, accords with requirements of circular economic development and green ore construction. Compared with a shallow hole shrinkage method, the mining method has the advantages of improving ore recovery rate, reducing ore dilution rate and improving ore removal grade and ore removal efficiency through production practice.

Description

technical field [0001] The invention relates to underground mining of metal mines, in particular to a mining method for thin and small ore bodies. Background technique [0002] For the ore body with an average thickness of less than 2.5m, the mine used the shallow hole retention method for mining in the past. During the mining process, the hanging wall rock collapsed seriously, the amount of temporary support was large, the safe operating conditions were poor, and the ore loss and dilution rate was high. ; The empty areas formed in the mining process are generally not treated, resulting in partial subsidence and cracks in the surface industrial sites, threatening the safety of surface buildings and structures, which is not conducive to safe production. Contents of the invention [0003] In order to solve the above-mentioned problems in the prior art, the present invention provides a mining method for thin and small ore bodies. [0004] The present invention adopts followi...

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Problems solved by technology

[0002] For the ore body with an average thickness of less than 2.5m, the mine used the shallow hole retention method for mining in the past. During the mining process, the hanging wall rock collapsed seriously, the amount of temporary support was large, the safe operating conditions were poor, and the ore loss and dilution rate was high. ;The empty areas formed in the mining process are generally not treated, resulting in partial subsidence and cracks in the surface industrial sites, threatening the safety of surface structures and not conducive to safe production

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