Open-pit mining method for triangular ore quantity between layered flat deposit strip areas

Abstract

The invention discloses an open-pit mining method for triangular ore quantity between layered flat deposit strip areas. Firstly, a deposit is divided into a plurality of parallel mining strip areas, cross sections of two adjacent strip areas are overlapped, side slopes of the overlapped areas intersect on a boundary between a coating layer and a coal seam, and a triangular area is formed between the two adjacent strip areas under the point of intersection; then the mining strip areas are mined one by one, when any strip area is mined, the triangular area with a next strip area is mined simultaneously, and an exposed face after mining to the boundary is covered in a matched stripping and internal dumping mode; and mining is performed in cycles until all the mining strip areas are mined. According to the method, repeated stripping quantity between the strip areas and the average stripping ratio of a mine are reduced effectively, triangular ore quantity pressed by two adjacent strip areas are recovered in advance, so that not only is the mining cost reduced, but also the overall economic benefit of the mine is improved.

Description

technical field [0001] The invention relates to a mining method of an open-pit coal mine, and is especially suitable for the open-pit mining of a triangular ore volume in a layered near-horizontal ore bed strip interval. Background technique [0002] Open-pit mining occupies a very important position in my country's mining engineering. It has outstanding advantages such as large production scale, high degree of mechanization, low mining loss, low dilution, high labor productivity, safety and good working conditions. Since the 1980s, most of the large-scale open-pit coalfields developed in my country are near-horizontal deposits, and the mining methods of zoned mining and inverted heap and internal drainage are mostly adopted. Because the open-pit mine is relatively wide, it can be divided into many longitudinal mining strips first, so that the stripped objects in the first strip can be stacked nearby along the outside of the open-pit mine boundary by adopting the more econom...

AI Technical Summary

Problems solved by technology

The first area of ​​the deposit mining can be excavated while in-line, and the interface of the first area will be gradually buried. After the mining is completed, the subsequent second area will be mined. The area will be re-mined and then landfilled within the repeated boundaries of the area, which will cause repeated stripping of the stripped objects within the mining range. The BDG triangle area is the amount of repeated stripping, resulting in an increase in the average stripping ratio of the mine and overall economic benefits. decline

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