Construct · 1 fields · 2 citations

placer: a standalone construct

One name. One construct. A landmark on the map.

● anchor · one construct, one field Nearest construct by meaning·not indexed
placer1 CONSTRUCTPlacerALLUVIAL HEAVY MIN

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Economic geology

Heavy minerals sorted loose by water

A placer is a deposit of valuable heavy minerals, classically gold, cassiterite, or diamonds, that have weathered out of their source rock and been concentrated by moving water or wind according to their density, so they collect in stream gravels, beach sands, and bars. It is the loose, sedimentary counterpart to a lode, won by washing and gravity separation rather than hard-rock mining, which is why panning and sluicing recover it. Robb's Introduction to ore-forming processes and Macdonald's Handbook of gold exploration and evaluation describe how gravity sorting forms and concentrates such deposits. The referent is a gravity-concentrated surficial accumulation of resistant heavy minerals.[1][2]

Unit
Grade and volume of heavy minerals in the host sediment
Recovery means
Not applicable
Measured by
Evaluated by sampling grain size and heavy-mineral grade of the sediment, and by the concentration achieved through gravity separation

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Nearby constructs

accumulation3 fields · 3 citationsjingle · one word, three constructsdensity4 fields · 6 citationsjingle · one word, four constructs

References

  1. Robb, L. (2004). Introduction to ore-forming processes. Blackwell Publishing. ISBN 9780632063789
  2. Macdonald, E. H. (2007). Handbook of gold exploration and evaluation. Woodhead Publishing. ISBN 9781845691752

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