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This paper reports the results of electron probe x-ray microanalysis (EPMA) aimed at identification of the modes of gold and silver occurrence in loose sediments of lithochemical stream sediments (LSS) of the Dukat gold-silver deposit in northeastern Russia. Modes of occurrence of major ore elements Ag and Au have been investigated and their chemical composition has been identified. The EPMA technique has been elaborated to measure the composition of stream sediments (minerals) containing silver and gold using the...

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 go...