SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Dor gold bars. A dor bar is a bar of a semi-pure alloy of gold and silver, of variable composition. It is usually produced at the site of a mine and transported to a refinery for further purification. Photographed at Petropavlovsk Group's pits in Selemdzhinsky District, Amur Region, Russia.
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