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  1. Said of a placer formed by the action of running water, as in a stream channel or alluvial fan; also said of the valuable mineral, e.g., gold or diamond, associated with an alluvial placer. AGI
  2. Pertaining to or composed of alluvium, or deposited by a stream or running water; e.g., an alluvial clay or an alluvial divide. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms

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