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  1. A term applied in the desert regions of the Southwestern United States to an extensive flat alluvium-floored basin or depression, into which drainage from the surrounding mountains flows toward a playa or central depression; a basin with internal drainage. Syn: playa basin AGI
  2. A temporary lake, usually saline, formed in a bolson. AGI
  3. Mex. A pocket of ore. Etymol: Sp., bolson, large purse.

Source: Dictionary of Mining, Mineral, and Related Terms

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