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...

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