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。
Platinum is found usually as alloys of 80-90% purity in placer deposits or more rarely combined with arsenic or sulfur.
通常铂在砂矿中以合金形式存在，其中包含80～90%的纯铂，或者不多见的是与砷或硫结合在一起。
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