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The rock is eroded; the gold remains, and the small pieces of gold are washed into the next stream. But gold is very heavy, and so it tends to deposit in holes on the ground of rivers, a deposit called placer.
Other deposits are polymetallic deposits, where hydrothermal processes, often in combination with sulfuric chemical reactions, deposited large amounts of different metals in submarine depressions or in clefts. Typically gold is the rarest metal in the ore, but depending on the percentage and the value, it may be the most valuable part. As it is rather easy to process those ores in furnaces and separate the different metals, those deposits are mine since the early Middle Ages...
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