... placer deposits 砂矿 diamond placer 金刚石砂矿 placer claim 砂矿区 ...
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diamond placer deposits 金刚石砂矿
placer diamond 金刚石砂矿
One material source of diamond is primary diamond mines and ancient placer in the ancient Yi River upstream in Shandong, the other is the primary diamond mine which may exist in this area.
金刚石的物质来源一是古沂河上游山东的金刚石原生矿和古砂矿，二是本区的可能存在的金刚石原生矿。
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