1 Shallow hole room column method should be used for gently inclined ore body with thickness less than 8m ; when the thickness of ore body is greater than 3m , it should be layered and recovered;
2 When the thickness of the ore body is 8m~10m , it is advisable to use the pre-control top and the medium-deep hole for recovery;
3 When the top and bottom plates of the ore body are more regular and the thickness is more than 3m , and the conditions permit, hydraulic drilling rigs can be used;
The number of exits that should be recovered at the same time in the four panels should not exceed three . The direction of advancement of the stope should be consistent with the direction of the panel, and the lead distance between the working faces should be 10m to 15m .
2 When the thickness of the ore body is 8m~10m , it is advisable to use the pre-control top and the medium-deep hole for recovery;
3 When the top and bottom plates of the ore body are more regular and the thickness is more than 3m , and the conditions permit, hydraulic drilling rigs can be used;
The number of exits that should be recovered at the same time in the four panels should not exceed three . The direction of advancement of the stope should be consistent with the direction of the panel, and the lead distance between the working faces should be 10m to 15m .
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