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MICRO STRUCTURAL PARTICULARITIES OF LOW-FINENESS GOLD
Abstract
The native gold containing high silver, extracted from gold bulk of few kilograms, was comprehensively researched. The studied through the optical microscope gold samples seem homogeneous and their fineness varies from 200 to 500 ppm. The fineness deviates from the mean value about В±20-30 ppm, however zonation is not observed. When the gold samples were dissolved in nitric acid, only silver was released into solution and gold remained in the insoluble remainder as the spongy-porous skeleton, consisting of pure gold micro particles isolated by micro cavities, which were formed due to dissolution of silver particles. The native gold containing high percentage of silver or the low- fineness gold, referred to as auric native silver or kustelite, is actually an ultra dispersed mixture of micro particles of pure gold and pure silver. It is proposed to draw a line between electrum and kustelite upon 500 ppm of fineness.
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References15
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