An open-pit mining method for mining inclined ore seams in medium-thick ore bodies

Abstract

The invention relates to an open stope mining method for mining inclined ore layers in a medium-thick ore body. The methods comprises the steps that the ore body is prospected; an upper layer accuratemining roadway and a lower layer accurate mining roadway are separately excavated in the ore body; a plurality of hole distribution lines are delineated in the lower layer accurate mining roadway; aplurality of shot holes and a plurality of blasting shot holes are drilled on the hole distribution lines in sequence, so that after the shot holes are blasted, the inner walls of the shot holes formblasting free surfaces; mineral products are obtained from the positions, corresponding to the shot holes, in the lower layer accurate mining roadway through blasting,; and then the mineral products are collected and transported out of the ore body. According to the technical scheme, mine is mined in a plurality of positions of the accurate mining roadways in sequence by a method of drilling and blasting in the direction opposite to the mining direction of the accurate mining roadways, and a plurality of groups of blasting free surfaces are formed in a mining stratum; and operators need to carry less machinery and equipment, so that an internal geological structure of a surrounding rock and the damage degree of stress are small, the personal safety of the operators is effectively guaranteed, the mining process is simplified, and the efficiency of mining operations is improved.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to an open-field mining method for mining inclined ore layers in medium-thick ore bodies. Background technique [0002] In the prior art, mining methods such as open-pit mining method, caving mining method, ore-retaining mining method and filling mining method are generally adopted for the mining of ore seams, among which open-pit mining method is the most widely used, and it refers to that in the process of mining, the main A mining method that relies on the stability of the surrounding rock itself or a small number of ore pillars and artificial pillars to support the goaf. When the open-pit mining method is used, the stability of the surrounding rock of the ore body is high. However, if the ore layer in the ore body is inclined relative to the horizontal plane, due to the poor stability of the surrounding rock of the ore body, roof collapse accidents are likely to occur...

AI Technical Summary

Problems solved by technology

When the open-pit mining method is used, the stability of the surrounding rock of the ore body is high. However, if the ore layer in the ore body is inclined relative to the horizontal plane, due to the poor stability of the surrounding rock of the ore body, roof collapse accidents are likely to occur. Great safety risk, especially in recent years, various mechanical equipment for mining operations are widely used in mines. Although the application of these equipment improves the efficiency of mining operations, due to the use of the equipment, the vibration generated by the equipment itself, etc. Factors increase the instability of the surrounding rock, and there is a large potential safety hazard. Therefore, when the open-field mining method is applied, the mining operation face has to be supported section by section. Due to the different geological structures of the surrounding rock, safety The safety cannot be fully guaranteed, and the support operation needs to consume a lot of manpower and material resources, and the labor intensity is high, which reduces the production efficiency of mining enterprises

Images