A method and structure for shallow hole ore retention and subsequent filling mining with combined mining of inner and outer courtyards

Abstract

A method and structure for shallow-hole ore-retaining and subsequent filling mining with combined mining of inner and outer patios. This method alternately arranges ore chambers and inter-columns along the strike of the ore body, and constructs inner and outer patios on the inter-column in the vein and outside the footwall. The inner patio runs through the whole stage, the height of the outer patio is half of the stage height, and the mining standards of adjacent mine houses are not shared; the body to be mined in the mine house is divided into upper and lower parts vertically. When the lower ore body is mined, personnel, etc. The stope is entered and exited through the in-vein courtyard. When the upper ore body is mined, the stope is entered and exited through the outer-vein courtyard and the upper section of the inner-vein courtyard; the back-air well is arranged at the end of the mine house, and the fresh air flow enters through the inner and outer pedestrian courtyard and stope connection road In the stope, the polluted air is discharged to the upper-stage return air system through the filling return air shaft; compared with the related art, the mining method of the present invention is used to mine the thin ore veins with steep inclination and crushing, which can greatly improve the ore recovery rate, production efficiency and operation safety. Reduce engineering maintenance costs and improve ventilation.

Description

technical field [0001] The invention relates to a mining method and structure for shallow-hole ore-retaining and subsequent backfilling with combined mining of internal and external patios. Background technique [0002] At present, in metal and non-metal underground mines, the shallow-hole ore retention and subsequent filling mining method is one of the most widely used mining methods for steeply inclined thin vein mining. In this mining method, inter-columns are left on both sides of the stope, and pedestrian patios and stope contact roads are arranged in the inter-column, so that the mining-cut ratio is small and the mining cost is low. However, this mining method is only suitable for relatively stable ore blocks, and has poor application effect on broken ore bodies. Due to the long mining period of the stope and the long exposure time of the pedestrian patio, when the ore body is broken, due to the frequent pressure relief disturbance of the local ore drawing, the pedest...

AI Technical Summary

Problems solved by technology

However, this mining method is only suitable for relatively stable ore blocks, and the application effect for broken ore bodies is poor.

Due to the long stope mining period and the long exposure time of the walkway, when the ore body is broken, affected by the local ore drawing frequent pressure relief disturbance, the walkway is prone to instability, deformation or collapse and blockage after the stope is mined to a certain height, and the engineering maintenance is difficult , directly affect the mining efficiency and operation safety, and even cause a large loss of the upper ore body in the stope; at the same time, the pedestrian patio in the vein is also used as the inlet and return air shaft, so it is difficult to control the air flow, and the ventilation effect in the stope is poor

[0003] Patent 201510383893.7 proposes a mining method with medium and deep holes. This method changes shallow hole rock drilling and blasting into medium and deep holes, shortens the recovery time of a single stope, and reduces the number of local ore drawing. However, this method is difficult to control side holes. The hole bottom distance is large, the large block rate is high, and it is easy to collapse the surrounding rock or filling body to cause ore dilution

[0004] The paper "Shanggong Gold Mine Shallow Hole Reservation Method Mining Technology Improvement" proposed a shallow hole ore retention method arranged outside the vein of the walkway. This method arranges the walkway and the stope connecting road outside the vein, and the engineering stability is relatively high. Good, but the contact road in the stope is long, the amount of engineering required for mining is large, and the cost of mining is high

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