SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Gold panning. Close-up of gold found by a gold panner in the Kayes Region of Mali. Panning involves swirling gravel from a stream or river in water in a shallow dish. The lighter stones and rocks will be lost, while the heavier metal ores, such as gold and silver, will be left behind. Photographed in February 2013.
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