Open pit and underground space-time synchronous mining method for multiple-ore body

Abstract

The invention discloses an open pit and underground space-time synchronous mining method for a multiple-ore body. According to the technical scheme, the method comprises the following steps: marking the demarcation line of the ore bodies at the shallow and deep positions so as to divide the multiple-ore body into a shallow-position ore body and a deep-position ore body according to an economical and reasonable stripping ratio; delineating the demarcation line of an open-pit mining protection zone according to a moveable angle (7) determined by underground mining by taking the largest demarcation ring of the open-pit mining as a protection line, wherein the deep-position ore body in the protection zone is a filling-process mining zone section (9) and the deep-position ore body outside the protection zone is a caving-process mining zone section (10); filling the waste stone stripped in open pit back to a waste stone back filled region (14) in a rubber belt conveying manner and carrying out cemented filling on the dead zone of the filling-process mining zone section (9) with tailings so as to form a tailings cemented filling region (11). According to the method, the technological characteristics of different mining manners such as open-pit mining, filling-process milling and caving-process mining are organically combined, so that the open-pit, underground space-time synchronous, environment-friendly and efficient mining of the multiple-ore body can be realized.

Description

technical field [0001] The invention relates to a mining technology, in particular to an open-pit and underground synchronous mining method with multiple ore bodies, which can be widely used in large-scale open-pit and underground mines with scattered and complex multiple ore bodies. Background technique [0002] More than 80% of the ore bodies in my country's metal mines are scattered and complex, and the mining scale is small, which cannot meet the needs of the national economy for mineral resources. It is urgent and critical to adopt multi-section simultaneous mining, multiple mining methods, and open-pit underground space-time synchronous mining technologies. [0003] There are three mining methods for existing deposits: (1) open-pit mining alone; (2) underground mining alone; (3) combined open-pit and underground mining. [0004] However, the above three mining methods obviously lack pertinence and adaptability to the large-scale mining of scattered and complex multi-or...

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Problems solved by technology

[0004] However, the above three mining methods obviously lack pertinence and adaptability to the large-scale mining of scattered and complex multi-ore bodies, mainly in the following two points:

[0005] (1) The above three mining methods have not fully considered the effective supporting effect on the stability of the surrounding rock after the filling method is used for mining, and the waste rock in the empty area or subsidence area is backfilled by the filling method, and it is impossible to realize large-scale open-pit, underground and multi-section mine Simultaneous mining

[0006] (2) When open-pit mining is used alone, it is impossible to use the empty area or subsidence area formed by underground mining to discharge waste, and a large number of waste rocks will inevitably be formed; when underground mining is used alone, it is easy to cause scattered shallow ore bodies. Permanent loss; in open-pit and underground joint mining, it is limited to ore bodies that are far apart and have no influence on each other

The common problems of the three mining methods are the small scale of mine production, great environmental damage, and the lack of consideration of the coordination of different mining methods and the reconstruction of the mining environment.

However, this paper does not consider the effective supporting effect on the stability of the surrounding rock after the filling method is used to deal with empty areas or waste rock backfilling in subsidence areas, and it is impossible to realize the large-scale simultaneous mining of open-pit, underground, and multi-section mines.

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