placer gold 沙金
old gold placer 古砂金矿
gold placer grade 砂金品位
boulder gold placer 巨砾型砂金矿床
gold placer reserves 砂金储量
Indonesia is rich in gold placer resources.
印度尼西亚砂金资源丰富。
Distribution of gold placer deposits is closely related with gold-bearing horizon, morphology and tectonism.
使金重新分布，砂金分布与金源、地貌和新构造运动关系密切。
The studied platinum - gold placer occurs in Quaternary alluvial - diluvial a piedmont valley of ultrabasic rocks, Northwest China.
该铂- 金砂矿产于超基性岩体山前谷地的第四纪冲积- 洪积层中。
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