Alluvial placer deposits, geology, exploration, mining, use - Page IIIThe geology of eluvial and alluvial placer deposits. . More generally the gold of placers occurs in small-flattened scales or grains averaging a few .. The external form color, luster and other features of placer gold visible to the naked eye are.alluvial gold grain color,WC/95/038 Alluvial gold characterisation in exploration planning .Many alluvial gold grains contain microscopic inclusions of other minerals. . and along fractures. Mercury-rich gold is grey-white colour. Field of view 0.2mm.WC/95/022 The interpretation of alluvial gold characteristics as an .Cumulative percentage plots of silver content of alluvial gold grains from. Ecuador. ... examination of polished blocks or sections by differences in colour.
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