plac·er /ˈplesɚ/
沖積礦,放置者
Pla·cer n. One who places or sets.
Plac·er n. A deposit of earth, sand, or gravel, containing valuable mineral in particles, especially by the side of a river, or in the bed of a mountain torrent. [U.S.]
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placer
n : an alluvial deposit that contains particles of some valuable
mineral