Transition connection mining technique from outdoor mine to underground mine

Abstract

The invention discloses a transition connection mining technique from outdoor mine to underground mine. A transition stage(2) from outdoor mining to underground mining is divided into a connection production middle section (4) and an emergency middle section (5); in the emergency middle section (5), mine chambers (13) and mine columns are divided, and the mine chambers (13) are firstly recovered by utilizing an open-stope method; in the mine chambers (13), upward drainage ventilation holes (12) are dug to be communicated with the connection production middle section (4); an enclosed waterproof door (11) is installed in a development drift (16) in the emergency middle section; a VCR (vertical crater retreat) method is adopted for mining by drilling rocks through an outdoor punching device (6) and discharging ores through an underground bottom structure; a drainage well (14) is drilled between a blind oblique well (10) and the waterproof door (11) and is communicated with the middle section of a main water bin; water accumulated in the mine chambers (13) is pumped and exhausted to the ground surface by a water pump in the main water bin, and the mine columns are recovered; then the underground mining stage (3) is transited. According to the invention, the safe and stable transition from outdoor mining to underground mining is realized, and the problems of underground sudden inflow of water threat, great damage of the preserved mine columns and difficulty in recycling at the rear stage are solved.

Description

technical field [0001] The invention relates to an open-pit-to-underground mining technology, in particular to a safe and efficient mining technology in the process of converting from open-pit to underground mining. It is suitable for wide application in large-scale non-coal solid mine open-pit to underground mining. Background technique [0002] Most of the large-scale open-pit mines in China are close to the final state of open-pit mining due to their long mining time and large scale, and are about to transfer to the underground mining stage. Due to the urgent need for resources and the sustainable development of mining enterprises, the problems of stable production, high efficiency and safe mining will follow during the transition period from open pit to underground. [0003] For mines that switch from open-pit to underground mining, there is a transition stage from open-pit to underground mining in the later stage of open-pit mining. Generally, two connection methods a...

AI Technical Summary

Problems solved by technology

The second connection method is more applicable, but although this scheme adopts the open-field method of leaving a stable structure of large-scale ore pillars in the underground mining process or fills the empty area, it leaves a large amount of material at the bottom of the open-pit mine. Security ore pillars may be filled with cement, which increases ore loss and mining costs, and reduces technical and economic indicators

At the same time, the transition plan also faces the problem of recovery of boundary pillars and pillars left by the open-field method, as well as the coordination and management of simultaneous open-pit and underground production.

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