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2 The working face of the mining face should be arranged by the ladder section. When using the upward hole, the length of the working face of the step should be 10m~15m ; when the horizontal hole falls, the length of the step should be 2m~4m ;
3 When the distance between adjacent steeply inclined parallel thin veins is greater than 4m , the interlayer is stable, and the vein shape and geological structure are simple, mining can be carried out;
4 slanting adjacent parallel thin veins for mining, when the interlayer is stable, it can be mined or mined simultaneously. At the same time, the mining should be carried out intensively, and the upper stop should be advanced by two stratification heights. When the ore is discharged, the upper stop should be advanced or decreased at the same time. When the local stability of the interlayer is poor, the lower mining stop should be ahead of the two stratification heights of the upper mining stop. When the mining is carried out, the upper mining stop should be advanced or decreased at the same time.
The use of shallow hole ore mining method shall comply with the following provisions
1 The shallow hole retention method should be used for the steeply inclined thin veins and medium-thick ore bodies that do not adhere to the ore, do not self-ignite, and do not expand with water ;