outcrop mining
... 露头矿：outcrop mine 露头开采：outcrop mining 露头层：outcropping bed ...
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招远市大河金矿对划归地下开采的一中段以上有露头大矿体，实行陡边坡露天开采。
The thick cropping orebody of a level and over which was originally put under underground mining was redesigned locarry on sleep slope opencutling.
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