Drift-pillar-free sublevel barnyard caving mining method of open pit transferred underground transitional period

Abstract

The invention relates to a drift-pillar-free sublevel barnyard caving mining method of an open pit transferred underground transitional period. The drift-pillar-free sublevel caving mining method comprises the following steps of: carrying out sublevel recovering; and finishing rock drilling, blasting and ore removing in a feeding path. The drift-pillar-free sublevel caving mining method is characterized in that at an open pit transferred underground recovering transitional period, open pit mining and underground hanging wall ore recovering are carried out at the same time; a barnyard method and a drift-pillar-free sublevel caving method are combined to recover hanging wall ore; when open pit ore is mined, a drift-pillar-free sublevel barnyard method is used for recovering a hanging wall ore sublevel feeding path; and after the open pit mining is finished, a drift-pillar-free sublevel caving method is used for carrying out large-scale blasting and ore removing on safety pillars, other sublevel ores and barnyard-method residual ores. The drift-pillar-free sublevel barnyard caving mining method disclosed by the invention has the advantages of effectively reducing accurate mining coefficient and saving economic cost. The accurate mining engineering amount is greatly reduced and the accurate mining invest is reduced at the same time; and the extracted ore amount and the production capability of unit accurate mining engineering are increased and the economic benefit is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of underground mining methods, and in particular relates to a mining method for segmental empty field caving without bottom pillars during the transition period from open pit to underground. It is especially suitable for mines where open-pit and underground mines are mined simultaneously during the transition period from open-pit to underground. Background technique [0002] According to the development status of my country's metallurgical mines, most iron ore mines have completed the mining process of hillside open-pit mines and deep concave open-pit mines, and gradually transferred to the underground mining stage. Especially in recent years, the mining speed of mines has been accelerated, the scale has been continuously expanded, and the service life of the original design has been continuously reduced. A large number of large-scale open-pit mines have begun or are preparing to switch from open-pit to unde...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problem of how to realize the mining of the underground hanging side mine in advance without affecting the normal mining of the open-pit mine in the process of converting the open-pit to underground mining, and how to still use the traditional sub-column caving method for back mining in the later stage. This type of mine provides an efficient, safe, low-loss, low-dilution, and strong applicability open-pit to underground transitional mining method without pillars and subsections

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