Minerals that occur as alluvial deposits in the sands of the valley floor are called [[1]]

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Minerals that occur as alluvial deposits in the sands of the valley floor are called placer deposits.
The effect of gravity on moving particles results in placer deposits, which are naturally occurring concentrations of heavy minerals. Weathering processes separate the stable minerals from their matrix; they slowly wash downslope and into water streams, which washes away the lighter flux material. As a result, heavy minerals become concentrated in streams, beaches, and residual gravels, forming ore deposits. Placer deposits have more dense minerals that are chemically resistant to weathering. They are long-lasting and stable. Minerals got identified in the sands of valley floors as alluvial deposits. These deposits typically contain minerals that are resistant to water corrosion. Gold, platinum, and zircon are minerals found in placer deposits.

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