1、[矿业]砂矿开采
... placer deposit 砂矿床；砂积矿床；砂砾矿床 placer mining 砂矿开采；淘金 placed 名列前茅的 ...
2、砂矿淘采
... placer iron 砂铁 placer mining 砂矿淘采 placer tin 砂锡 ...
3、冲积矿采矿
... pioneer先锋 placer mining冲积矿采矿 plain平原 ...
4、淘选采矿法
... 淘洗法 elutriation 淘选采矿法 placer mining 淘选度 grading ...
gold placer-mining采金场
placer gold mining砂金矿开采
placer r mining砂矿淘采
beach placer mining industry海滨砂矿开采业
beach placer mining海滨砂矿开采
method of littoral placer mining滨海砂矿开采法
hydraulic mining of placer砂矿露天水力开采