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Placer deposits refer to mineral accumulations formed by the action of water, typically found in riverbeds or streambeds, where heavier materials like gold or gemstones settle due to their density. Dredging, on the other hand, is an excavation process used to remove sediment, debris, or minerals from underwater areas, often employed to extract resources from placer deposits. While placer deposits indicate the location and nature of valuable minerals, dredging is the technique used to retrieve those minerals.

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