Underhand slicing open stope mining method for gently inclined medium-thick ore body

Abstract

The invention belongs to the technical field of underground mining methods for metal deposits, and discloses a underhand slicing open stope mining method for a gently inclined medium-thick ore body tosolve the problems existing in the mining of the gently inclined medium-thick ore body in the prior art. The method includes the following steps: dividing the ore body into ore blocks, reserving a bottom column, a top column and intermediate columns, digging a raise shaft for air intaking and people walking in the bottom column, digging a roof cutting tunnel to the top column, and digging a raiseshaft for air returning and people walking in the top column to be communicate with a transportation tunnel in a previous stage; drilling horizontal blastholes in the roof cutting tunnel, blasting the ore body at an uppermost layer, scraping collapsed ore to an ore pass, and mounting hanging wall roof protecting anchor rods; and drilling downward blastholes by using a layer-by-layer breakdown method from top to bottom, blasting and collapsing the layered ore body, blasting the ore and scraping the ore body to the ore pass. The downward stratified open stope mining method of the invention adopts an extracting method, has the advantages of simple process, less mining and cutting work amount, low dilution rate and the like, avoids ore spontaneous combustion or agglomeration caused by ore overstocking in a stope, and is suitable for the ore bodies having hanging walls with medium stability or less and the ore having the characteristics of spontaneous combustion or agglomeration.

Description

technical field [0001] The invention relates to the technical field of underground mining methods for metal ore deposits, in particular to an open-field mining method for downward layering of gently inclined medium-thick ore bodies. Background technique [0002] According to Zhou Chongren's article "Several Problems in Mining Inclined and Medium-thick Ore Bodies": Inclined and gently inclined medium-thick ore bodies are a common ore body form in my country, and this type of ore body accounts for about 10% of the total reserves of chemical mines. More than 70%, accounting for about 35% of the gypsum deposits in building materials mines, and about 18% in iron ore deposits in metallurgical mines. For this type of deposit, underground mining is a relatively weak link. The reason for the gently inclined medium-thick ore body is mainly due to the constraints of the dip angle and thickness of the ore body. When mining with the open-field method, it is very difficult to carry the sto...

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Problems solved by technology

For this type of deposit, underground mining is a relatively weak link. The reason for the gently inclined medium-thick ore body is mainly due to the constraints of the dip angle and thickness of the ore body. When mining with the open-field method, it is very difficult to carry the stope and manage the roof. The problem of ore drawing loss and dilution is more prominent when using the sub-caving method to mine. The excavation and cutting volume of mining by the chassis funnel method is very large. In addition, the value of ore is mostly low, which limits the selection and application of the filling method. Therefore, in the relevant mines There are many problems in mining

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