Underhand sublevel open stoping method

Abstract

The invention relates to the technical field of stoping methods and particularly relates to an underhand sublevel open stoping method. The underhand sublevel open stoping method comprises the following steps: firstly, arranging an ore block along the direction of an ore body and dividing the ore block into an ore room and an ore column; dividing the ore block into 3-5 sublevels in the vertical direction, wherein each sublevel is 8m-12m high; arranging an access along the extending direction, and carrying out retreating stoping from two ends to the center of the ore body; under the protection of a support pillar, carrying out sublevel stoping in sequence from top to bottom; carrying out layered ore drawing by adopting a scraper end part ore drawing manner; carrying out ore drawing under an upper sublevel ore coverage layer at an upper sublevel; and after whole ore room stoping is finished, collapsing the support pillar, and releasing support pillar ores and open stope residual ores from a bottom funnel. The method is flexible, has rapid effect and integrates advantages of a non-pillar sublevel caving method and a sub-level room stoping method, and a new process is provided for recycling medium-stable and medium-thick ore bodies.

Description

technical field [0001] The invention belongs to the technical field of mining methods, and in particular relates to a downward segmented open-field mining method. Background technique [0002] When the traditional method is used to mine moderately stable or medium-thick inclined or sharply inclined ore bodies, the sub-level caving method without pillars or the stage mine method is usually used. However, the non-pillar segmental caving method will cause a large amount of chassis loss in the footwall and frontal dilution during the mining process; while the stage mine method needs to be mined after the entire ore block mining and cutting project is completed, sometimes preparing for a stage It takes two years to mine the mining house method, resulting in a backlog of a large amount of funds and ore. Therefore, it is necessary to find a new mining method, which can combine the advantages of the non-pillar segmental caving mining method and the stage mine method, and adds a new...

AI Technical Summary

Problems solved by technology

However, the non-pillar segmental caving method will cause a large amount of chassis loss in the footwall and frontal dilution during the mining process; while the stage mine method needs to be mined after the entire ore block mining and cutting project is completed, sometimes preparing for a stage It takes two years for the mining house method stope, resulting in a large backlog of funds and ore volume

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