Mining method for passing open-pit coal mine of coal barren area through leaving island to build bridges

Abstract

The invention belongs to the field of coal mining, and particularly relates to a mining method for passing an open-pit coal mine of a coal barren area through leaving an island to build bridges. The mining method comprises the following steps: when an open pit is advanced to the coal barren area, determining the range of an island body according to the range of the coal barren area, establishing an island-back transportation conveyer bridge between the island body of the pit and an inner dump, and building an island-front conveyer bridge when the inner dump crosses the island body of the pit. The mining method has the advantages of decreasing the overburden amount in the ore field, reducing the production stripping ratio, saving the land occupation of an outer dump, being environment-friendly, decreasing the mining disturbance of the pit, shortening the truck load distance, reducing the stripping and transportation costs, increasing the economic benefit and having wide practicability.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a mining method for open-pit coal mines with islands and bridges passing through coal-free areas. Background technique [0002] The open-pit mining boundary is the spatial outline formed at the end of the open-pit mining. When complex geological structures such as collapse columns and coal-free areas appear in the mining boundary, the coal seam will be discontinuous and partially unmineable. Therefore, it is necessary to reduce the ineffective stripping during mining. quantity. [0003] Under the premise of not changing the mining procedure, the traditional method of controlling the stripping ratio is to adjust the mining parameters of perforation, blasting, mining and transportation, and rock drainage. This method distributes the invalid stripping amount to different mining periods, and does not really Significantly reduce the amount of ineffective stripping. However, wh...

AI Technical Summary

Problems solved by technology

[0003] Under the premise of not changing the mining procedure, the traditional method of controlling the stripping ratio is to adjust the mining parameters of perforation, blasting, mining and transportation, and rock drainage. This method distributes the invalid stripping amount to different mining periods, and does not really reduce the amount of ineffective stripping

However, when the single-bucket-truck intermittent mining process is used for internal transportation, single-ring or double-ring internal transportation is usually used. Due to the large transportation distance and high transportation costs, the economic benefits of open-pit mining are greatly affected.

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