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MICRO STRUCTURAL PARTICULARITIES OF LOW-FINENESS GOLD

AUTHOR/S: VL. SAMUSIKOV, L. PAVLOVA
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 89-96 pp

ABSTRACTS

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 ±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.

Keywords: low-fineness gold, auric native silver, electron probe microanalysis, microstructure, kustelite

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