Whether the sill-free sublevel caving mining method is suitable to break and broken orebody has been being discussed for a long time.
无底柱分段崩落采矿法是否适用于松软破碎矿体，一直是采矿界争论的焦点。
Whether the sill-free sublevel caving mining method is suitable to break and broken orebody has been being discussed for a long time.
无底柱分段崩落采矿法是否适用于松软破碎矿体，一直是采矿界争论的焦点。
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