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Gold panning. Prospector panning for gold in South Dakota, USA. 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. Gold was discovered in the Black Hills of South Dakota in 1874, leading to what is considered to be the last great gold rush in the continental USA. South Dakota continues to produce large amounts of gold.
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