1. The sub-column-free sublevel caving method should be applied to the steep or moderate stability of the ore and the surrounding rock. The surrounding rock is not stable or moderately stable. The steep ore thick ore body with low ore value is not high. ;
2. For extremely thick ore bodies with a thickness greater than 50m, the sectioned alluvial can be opened in the center of the ore body, or the mining area can be divided along the strike, and the ore blocks can be divided in the mining area;
3. The main technical parameters of the recovery should be determined by mining method tests. When the experimental research parameters are not obtained, the height of the section may be 10m~15m, the spacing of the approach may be 10m~20m, the step of the collapse shall not exceed 3m, and the inclination of the edge of the fan hole may be 60°~70°;
4. Above the mining face, there should be a cover rock layer larger than the section height; if the amount of rock that cannot be self-propelled or falling on the upper plate does not reach the specified thickness, it should be forcedly topped in time and should be covered. The thickness of the rock formation is about twice the height of the section;
5. When the ore is not stable enough, effective measures should be taken to prevent deformation and blockage of the blasthole and damage to the top eyebrow line at the end of the approach;
6. The adjacent working face of the same section shall be formed in a stepped shape;
7. When the upper and lower sections are simultaneously harvested, the upper section shall be advanced to the lower section, and the advanced distance shall be such that the upper section is outside the range of the displacement of the lower section of the mining face, and shall not be less than 20 m;
8. After the section is completed, the slippery port of this section shall be closed in time.
2. For extremely thick ore bodies with a thickness greater than 50m, the sectioned alluvial can be opened in the center of the ore body, or the mining area can be divided along the strike, and the ore blocks can be divided in the mining area;
3. The main technical parameters of the recovery should be determined by mining method tests. When the experimental research parameters are not obtained, the height of the section may be 10m~15m, the spacing of the approach may be 10m~20m, the step of the collapse shall not exceed 3m, and the inclination of the edge of the fan hole may be 60°~70°;
4. Above the mining face, there should be a cover rock layer larger than the section height; if the amount of rock that cannot be self-propelled or falling on the upper plate does not reach the specified thickness, it should be forcedly topped in time and should be covered. The thickness of the rock formation is about twice the height of the section;
5. When the ore is not stable enough, effective measures should be taken to prevent deformation and blockage of the blasthole and damage to the top eyebrow line at the end of the approach;
6. The adjacent working face of the same section shall be formed in a stepped shape;
7. When the upper and lower sections are simultaneously harvested, the upper section shall be advanced to the lower section, and the advanced distance shall be such that the upper section is outside the range of the displacement of the lower section of the mining face, and shall not be less than 20 m;
8. After the section is completed, the slippery port of this section shall be closed in time.
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