1) 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。
4) discharging tailing in the open pit
露天坑排尾
5) open pit
露天开采坑
6) slate pit
页岩露天矿坑
补充资料：没底坑
1.谓永远填不平的坑。比喻永远满足不了的欲望。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条