1 ) Stope layout
According to the thickness of the ore body, the mining area can be arranged along the direction of the ore body and the vertical ore body. Figure 1 shows the mining area along the direction of the ore body. The height of the stage depends on the allowable exposed area of ​​the surrounding rock, generally 50~70m, and the foreign mines have 120~150m; the length of the mine is mainly determined by the stability of the ore and surrounding rock, and the effective transport of the electric raft is also considered. The distance is generally 40~60m; the size of the top column, the bottom column and the column are determined according to the stability of the rock, the mining method of the pillar, and the engineering arrangement in the pillar; the height of the section is determined by the rock drilling equipment used. When the YGZ-90 rail drilling machine is 12~15m, it can be increased to 15~20m when using the downhole drilling rig . The increase in section height can reduce the number of sectioned rock drilling roadways and reduce the amount of mining work.
Fig.1 Conceptual diagram of the mining method in the staged rock drilling stage
A—projection map; b—stereo map (part of the mine)
1—stage clearing; 2—crossing lane; 3—ventilating pedestrian patio; 4—electric ramp; 5—ore silo;  6— segmented rock drilling roadway;
7—Funnel wear; 8—Funnel neck; 9—Laundering alley; 10—cutting patio; 11—pull space; 12—funnel; 13 —intercolum;
14—bottom column; 15—top column; 16— upper stage roadway; 16—upward fan-shaped deep hole
2 ) Precision cutting
In the ore body, the flat roadway 1 is transported in the excavation stage, and the cross road 2 is excavated from the stage roadway in the middle column. From the end of the cross road, the ventilation and pedestrian patio 3 are drilled in the center of the ore body thickness. From the patio, dig into the bottom of the flat road 9 and the section of rock drilling and alley. From the stage transport roadway, the ore chute 5 and the electric roadway 4 are excavated. The funnel wear 7 and the funnel neck 8 are drilled every 5~7m from the electric roadway. In the center of the mine, the cutting patio 10 is drilled from the flat bottom.
The main purpose of the cutting work is to create a free surface for the mining work, including: from the bottom of the pull-flat road to the full thickness of the ore body to form the bottom space 11; the upper part of the funnel neck is expanded into the funnel 12 Leakage); the cutting patio is enlarged into a cutting trough. Since the working face is vertical, the bottoming and leaking work in the lower part of the mine does not need to be completed all at once, and can be carried out step by step with the advancement of the mining face. Under normal circumstances, the bottom and the leak should be ahead of the hopper distance of 1~2 rows of the working face.
3 ) Recovery
After the bottoming, the expanding funnel and the cutting groove are formed, a fan-shaped medium-deep hole 17 is punched in the section rock drilling roadway, and the cutting groove is a blasting free surface, and the blasting is performed in several times, and each row is blasted by 1 to 5 rows of deep holes. The charge is carried out mechanically or manually, with millisecond blasting. The falling ore falls to the bottom of the mine with its own weight, and is slid into the electric roadway through the funnel to pass through the electric raft to the chute, and is loaded and transported in the stage.
4 ) Ventilation
Ventilation during the mining of the mine mainly ensures smooth air flow in the electric ramp. The line is: fresh air flow enters from the ventilation and pedestrian patio near the electric winch. After cleaning the electric ramp, the other side patio enters the sectioned rock drilling roadway, and finally the dirty wind enters the upper back wind flat alley through the patio. The well drains the ground.
5 ) Pillar mining
The pillar of the mining method in the staged rock drilling stage can be recovered by the open field method or the caving method. Before the collapse of the mine, the rock drilling roadway and the ore-mining facilities are first constructed in the pillar.
6 ) Evaluation
The section rock drilling stage mining method is a common mining method when returning to the medium-thickness ore body with stable rock mass. It has high recovery strength, high labor productivity, low mining cost and safe mining operation (rock drilling and mining are in It is carried out in a special roadway, and personnel do not enter the stope. However, the serious disadvantage of this method is that the proportion of mineral ore is 35~60%, and the loss and depletion are greater when returning to the mining column;
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