Jamb recovery and cushion layer formation integrated technology in process of mining from outdoors into underground

Abstract

The invention discloses a jamb recovery and cushion layer formation integrated technology in the process of mining from outdoors into underground. The technology comprises the following steps of: in the later stage of opencast mining, reserving a boundary pillar (1) at the bottom of an open pit, and carrying out underground mining on a first middle section in the process of underground mining by a large-parameter studding open-stope method; when the opencast mining and the open-stope method zone mining are ended, distributing blasted holes in the boundary pillar (1), distributing blasted holes in a jamb (3), charging powder at the same time and detonating in a segmented way, firstly detonating the blasted holes in the jamb (3), detonating the blasted holes in the boundary pillar (1) at the bottom of the open pit, and enabling fallen ores formed in a detonating way to form a cushion layer (4); and mining at a later-medium section in the process of underground mining by a caving method, and recovering the cores of the cushion layer (4) in the process of mining at a zone adopting a caving method. According to the technology, the open work and the underground work are carried out at the same time, the transition is stable, the safety in the process of open mining and underground mining can be improved, a mass of ores are recovered, a covering cushion layer for mining adopting the caving method can be solved, and the dilution ratio caused by the caving method can be greatly reduced.

Description

technical field [0001] The invention relates to an open-pit-to-underground mining technology, in particular to pillar recovery and cushion formation technology in the process of open-pit-to-underground mining, and can be widely used in open-pit to underground mining in black, non-ferrous, chemical and other non-coal solid mines. Background technique [0002] When the burial depth of mineral resources is too large, it is technically and economically unreasonable to use open-pit mining, and underground mining must be carried out. At present, most ferrous metal open-pit mines in my country are about to face the problem of shifting from open-pit to underground mining. The transition from open-pit mining to underground mining will encounter many new technical problems, and how to achieve a smooth transition during the transition period, reduce mining costs, and increase resource recovery rates are the main issues that companies are most concerned about. [0003] In mines convert...

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Problems solved by technology

However, the article did not reveal the problems of pillar mining and cushion formation

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