1) Under-the-open-pit bottom ore
露天底下矿石
2) pit quarry
地下运输露天矿
3) waste dump of surface mine
露天矿废石场
4) open pit bottom
露天坑底
1.
After the finish of open pit mining in Cangshang mining area of Sanshandao gold mine,little segment caving mining method without sill pillar is carried out to make use of the low-grade medium-thick cracking gold orebody in the open pit bottom.
针对三山岛金矿新立分矿仓上矿区中厚破碎金矿体露采结束后,露天坑底低品位中厚破碎金矿体,介绍了小分段无底柱崩落采矿法回采实践。
5) open-underground combined mining method
地下与露天联合采矿法
6) surface underground combined mining method
露天-地下联合采矿法
补充资料：底下人
1.旧称出身微贱的人。多指奴仆。
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