Population and application of the dilutionratioore drawing method has certain social value and economic value for implementation of the sill pillar-free subdrifting method.
低贫化放矿的推广应用对于实行无底分段崩落法的矿山具有一定的社会价值和经济价值。
2
In the mining system which conveys ore by blasting force, the ratio of mined tonnage to development is low and the oredilution and loss are less, leading to good cost effectiveness.