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The particularity of pillar mining in ore mining
When using the caving method to return to the mining column, the ore-extracting conditions are worse than those in the mine. Because when the ore body inclination angle is 55 ~ 70 °, the empty field method is used to return to the mining room, the ore can be released smoothly by its own weight, and when it is returned to the mining column by the caving method, the ore body is discharged under the condition of covering the upper part of the rock. Dip angle, the effect of mining is quite different. Many of the ore remains in the lower plate and cannot be lost. In this case, the throwing ore mining method cannot be used to improve the ore loss index.