Sublevel caving method without sill pillar is adopted in the south section of Fengshan Copper Mine.
丰山铜矿南缘采区应用无底柱分段崩落法采矿。
Wu Fengshan escorted them to airport in person so that a decision could be made right on the spot, if something unexpected occurred.
吴丰山亲自护送到机场，为的是万一发生不测事件，当场就能拍板处理。
The Shishan and Fengshan deposits, two main ore deposits in the Yimen copper ore district, were long considered to be of terrigenous metamorphosed sedimentary origin.
长期以来，云南易门铜矿区中的狮山和凤山铜矿床被认为是陆源沉积变质成因。
应用推荐