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placer1

[plas-er] /ˈplæs ər/
noun, Mining.
1.
a surficial mineral deposit formed by the concentration of small particles of heavy minerals, as gold, rutile, or platinum, in gravel or small sands.
2.
the site of a form of mining (placer mining) in which a placer deposit is washed to separate the gold or other valuable minerals.
Origin
1835-1845
1835-45, Americanism; < American Spanish; Spanish: sandbank < Catalan placel, derivative of plaza open place; see plaza
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for placer mining

placer

/ˈplæsə/
noun
1.
  1. surface sediment containing particles of gold or some other valuable mineral
  2. (in combination): placer-mining
Word Origin
C19: from American Spanish: deposit, from Spanish plazaplace
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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placer mining in Science
placer
  (plās'ər)   
A surface deposit of minerals, such as gold or magnetite, laid down by a river. The minerals are usually concentrated in one area because they are relatively heavy and therefore settle out of the river's currents more quickly than lighter sediments such as silt and sand. ◇ The extraction of minerals from placers, as by panning, washing, or dredging, is called placer mining.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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