An optimization method for the mining boundary of the lower coal seam in an open-pit mine

Abstract

The invention provides a method for optimizing mining boundaries of underlying seams of strip mines. The method comprises steps as follows: establishing a model for the cost caused by increase of the internal drainage distance of overburden materials of overlying seams due to mining of the underlying seams; establishing a model for the extra unit mining cost for mining of the underlying seams with the optimized overall economic benefit of ore deposit mining as the goal; determining the extra unit mining cost for mining of the underlying seams; establishing an average thickness function of the underlying seams and an average thickness function of overlying strata of the underlying seams; delineating the mining boundaries of the underlying seams of the composite seam strip mines. According to the method, the extra unit mining cost for mining of the underlying seams is considered, so that the economic stripping ratio of the underlying seams of the horizontal or near-horizontal composite seam strip mines is optimized, the reasonable economic stripping ratio is determined, the mining boundaries of the underlying seams are adjusted reasonably, and the better economic benefit can be created.

Description

technical field [0001] The invention belongs to the technical field of ore deposit mining, in particular to a method for optimizing the mining boundary of the lower coal seam of an open-pit mine. Background technique [0002] In the mining design of open-pit coal mines in my country, the boundary stripping ratio n is widely used k Less than or equal to economic stripping ratio n j The principle of delineating the boundary of open pit mining. The traditional method to delineate the mining boundary of composite coal seam open-pit mines usually regards each mineable coal seam as a whole, and determines the stripping ratio of the open-pit mine boundary through the side-line segment ratio method, and delineates the open-pit mine according to the principle that the boundary stripping ratio is less than or equal to the economically reasonable stripping ratio Mining boundaries. However, in open-pit mines with horizontal or near-horizontal composite coal seams, the mining cost is ...

AI Technical Summary

Problems solved by technology

However, in open-pit mines with horizontal or near-horizontal composite coal seams, the mining cost is closely related to the location of the coal seam because the stripping, mining, and drainage works of each mineable coal seam are ahead and behind in the advancing direction. Stripping ratios vary

Taking each mineable coal seam as a whole and delineating the mining boundary according to a unified economic stripping ratio, it is impossible to maximize the economic benefits of deposit mining

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