downward d mining 下行开采
downward filling mining method 下向充填采矿法
downward cemented filling mining 下向胶结充填采矿法
downward cut-and-fill mining 下向胶结充填法
The indoor experiment on the filling materials used for downward slicing drift mining with cemented backfill in Gaolong Gold Mine was performed.
对高龙金矿下向分层进路胶结充填采矿法所用的充填材料进行了室内试验研究。
A steeply inclined downward running ribbed belt conveyor is developed according to the funnel layout at Xieyi coal mine in Huainan to meet the demand in coal mining with inclined coal bed.
为适应倾斜煤层开采的需要，结合淮南谢一煤矿巷道布置，研制了一台大倾角下运花纹带式输送机。
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