![]() ![]() Many gold dredges are built as a mobile system that mechanically separates gold from gravel and sediment by sifting through gold suspected placer deposits along rivers and channels. Over time, a new gold deposit will form at that spot in the river. At that point, the water doesn’t have the power to move the heavy gold particles, but it still washes away any regular sediment. Downstream, however, the river eventually slows down somewhat. The gold is washed away along with everything else. Now imagine that a gold deposit is being eroded by a fast-flowing river. ![]() That means that grains of native gold are much harder to transport by water: you need really fast-flowing waters to get the gold grains moving. Its density is considerably higher than that of the regular minerals, such as quartz, that form regular rocks. When this happens, the rock and the gold particles that together make up the deposits are washed away as sediment in the river. The gold in such deposits can be released when, over time, the deposit comes to the surface and is eroded by wind and water. The gold that ends up in riverbeds ultimately still comes from deposits that formed underground. Usually, gold deposits can form in two broad ways: underground, associated with magmatic processes (the movement or emplacement of molten rock) or at the earth’s surface, associated with the movement of water. So why gold can be found in and alongside bodies of water Small suction machines are currently marketed as “gold dredges” for individuals seeking gold, for example, many amateur in offshore from the beach of Nome, Alaska, are using small portable gold dredge sucking for placer gold in riverbed. The original gold dredges were large, multi-story machines built in the first half of the 1900s. A gold dredge usually refers to a placer mining machine that extracts gold from sand, gravel, and dirt using water and mechanical methods. ![]()
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