Wedge transferring transition method for transferring from open-pit mining to underground mining

Abstract

The invention discloses a wedge transferring transition method for transferring from open-pit mining to underground mining. The method comprises open-pit deepening mining of footwall side ore bodies, underground mining of hanging wall side wall-connected ore bodies with an induced caving method and wedge transferring from open-pit mining areas to underground mining areas; wedge surface angles are required to meet the open-pit safe mining requirement and not higher than rock movement controllable angles in induced caving areas; steep slope mining of footwall side ore bodies in the open-pit mining areas is performed, and deepening mining is performed on the last 2-3 steps with a cross-mining and in-pit dumping method; the production scale is quickly formed by the aid of open-pit digging measure engineering in stopes adopting the underground induced caving method; induced caving engineering adopts a from-far-to-near stoping sequence, and heights of gobs are determined according to the requirement that collapse pits on through ground surfaces can accommodate the slope rock movement bulk solid amount. The method fundamentally solves problems of poor safety production conditions and difficulty in yield linking in transitional periods of large iron mines and lays a foundation for stability of transferring from open-pit mining to underground mining or yield increase.

Description

technical field [0001] The invention relates to the technical field of open-pit and underground mining of metal ore deposits, in particular to a wedge-shaped transition method for converting open-pit to underground mining. Background technique [0002] About 90% of large-scale open-pit iron mines in my country have entered into deep mining, and many of them are gradually being transferred to underground mining. During the transition period from open-pit to underground mining, the transitional method of leaving boundary pillars or setting overburden is usually adopted. Open-pit mining and underground mining interfere with each other, poor safety production conditions and difficult output connection, resulting in large-scale iron ore mining from open-pit to underground mining in my country. The phenomenon of production reduction transition or production suspension transition is common in Shanshan. The reason is mainly that the conventional transition method separates the open-...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a wedge-shaped transfer transition method for open-pit to underground mining, which fundamentally solves the difficult problems of poor safety production conditions and difficult output connection during the transition period of large-scale iron mines, and lays a solid foundation for ensuring a stable transition from open-pit to underground or increasing production. Base

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