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secondary mineral resources
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secondary mineral resources
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二次资源开采
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secondary mineral resources
二次矿产资源
在矿床开采和选矿过程中产生的,仍堆存或遗留在矿区范围内的矿柱、残留贫矿、尾矿和崩落区废石等可以回收和利用的资源。
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pearl mica
pearl millet
pearl of Sluze
pearl oyster
pearl oysters
Pearl Pagoda
Pearl Poet
Pearl-Reed curve
Pearl River
Pearl River delta agriculture
Pearl River delta economic zone
Pearl River delta of China
Pearl River Delta urban agglomeration urban agglomeration
Pearl River Delta urban innovative agglomeration
Pearl River estuary
Pearl River Estuary fishing ground
Pearl River Film Studio
Pearl River Fisheries Research Institute
Pearl River flood in 1915
Pearl River flood in 1994
Pearl River Hydraulic Research Institute
Pearl River Model
pearl river shelterbelt construction project in China
Pearl River Water Conservancy Commission of the Ministry of water resources
Pearl Satchel of the Three Caverns
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