SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Gold ingots at the Muruntau ore-dressing facility in communist Russia. The ingots, each weighing 12 kilograms, are being prepared for transportation to the state bank of the USSR. An ore dressing plant is part of a mining operation where the ore (or, in this case, the metal itself) is separated from worthless material picked up when mining.
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