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placer deposit

   Also found in: Wikipedia, Hutchinson 0.01 sec.

placer deposit

Natural concentration of heavy minerals caused by the effect of gravity on moving particles. When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into streams that quickly winnow the lighter matrix. Thus the heavy minerals become concentrated in stream, beach, and lag (residual) gravels and constitute workable ore deposits. Minerals that form placer deposits include gold, platinum, cassiterite, magnetite, chromite, ilmenite, rutile, native copper, zircon, monazite, and various gemstones.
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0 pm according to laboratory reports, he said and added the gold washers still recover gold from placer deposits of Gilgit-Baltistan.
Gemstones of Rs. 500 mln value extracted annually from ... by Balochistan Times (Baluchistan Province, Pakistan)
The Belgian Congo was largest producer by leaps and bounds, supplying from placer deposits over 50 percent of the earth''s stockpile.
The Early History of the Diamond by Lynette Tyson / Women's issues/gender studies community
Placer deposits are usually alluvial (river-related) and can concentrate other heavy minerals, such as gold.
Selling diamonds at the PDAC by Diopside / Stockhouse
 
 
 
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