Distribution of gold placerdeposits 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。
2
Platinum is found usually as alloys of 80-90% purity in placerdeposits 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。
3
The formation of fluvial Au placerdeposits is controlled by the factors of material sources, morphology, topography, Quaternary stratigraphy and hydrodynamics.