A kind of mining method of subdividing the empty area and then filling the empty area

Abstract

The invention provides a mining method for subdividing the open space and then filling the goaf, including open space mining and goaf filling. During the open space mining process, the ore body is divided into zones along the depth extension direction according to the vertical plane of the ore body , the width of each partition is determined according to the allowable span of the goaf corresponding to the allowable height of the gob fall in the partition, and there are permanent partition pillars supporting the roof rock layer in the mining process between the partitions, and the mines in each partition The body is continuously mined with the open-field method; the allowable height of the goaf to fall is located below the strength-weakened rock formation affected by the surface; Fill all the openings on the surface and fill the post-mining caving area in the subregion. It eliminates the mutual interference between mining and filling processes, and at the same time increases the size of the empty field to minimize mining costs and maximize production capacity.

Description

technical field [0001] The invention belongs to the technical field of underground mining of metal ore deposits, and in particular relates to a mining method for subdividing an empty field and then filling the empty field. Background technique [0002] my country's metal deposits are rich in resources but poor in endowment. With the exhaustion of high-grade deposits, low-grade metal deposits have become important resources for combat readiness, and the demand for protection of the mining environment is increasing. Therefore, there is an urgent need for new mining methods with low cost and surface protection. method. [0003] In order to protect the surface environment from being damaged, it is necessary to fill the goaf. The filling mining method has been vigorously developed in recent years. In order to reduce production costs and increase production capacity, the filling method is developing in the direction of increasing the size of the goaf. One is to increase the size o...

AI Technical Summary

Problems solved by technology

However, the method of filling the goaf after mining by the open-field method still has the problem of mutual interference between mining and filling, and the size of the open-field is limited by the stability of the surrounding rock near the mine. When the stability of the surrounding rock near the mine is poor, the size of the open-field is allowed Small, resulting in low production capacity and high cost, for the mining of low-grade ore deposits, there is still the problem of poor mining economic benefits

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