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Placer deposit | geology |

Minerals that form placer deposits have high specific gravity, are chemically resistant to weathering, and are durable; such minerals include gold, platinum,...

Placer deposit - Wikipedia

In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. The name is from the Spanish word placer, meaning "alluvial sand". Placer mining is an important source of gold, and was the main technique...

Placer Deposit - an overview | ScienceDirect Topics

Placer deposits being characteristically stratified with layers of mineral concentration, particularly in bedrock, sampling becomes a troublesome job. In the event...

(PDF) Placer Mineral Deposits - ResearchGate

4 May 2016 ... PDF | Concentration of heavy minerals in placer deposits Steps for Making a Placer Mineral Deposits Placer Locates Types (Classification) of...

Alluvial and Placer Mineral Deposits | Geology for Investors

5 Aug 2013 ... Technically a placer deposit is the general term for a mineral deposit formed by the concentration of moving particles by gravity. Alluvial is the...

Economic Geology - Minerals and Mining in Hong Kong - CEDD

Some mineral deposits have been exploited commercially. .... concentrated naturally by gravity separation in flowing water to produce alluvial placer deposits.

Gold in Placer Deposits - USGS Publications Warehouse

deposits in the Virginia City-Alder Gulch District, Montana / by Daniel R. Shawe and ... Map of California showing principal placer-gold mining areasGG5. G2.

EarthWordPlacer - USGS

25 Apr 2017 ... Placers are a type of mineral deposit in which grains of a valuable mineral like gold or the rare earths are mixed with sand deposited by a river...

GOLD PLACER DEPOSITS - Earth Science Australia

Energy and Minerals - The geology and methods of mining gold placer type deposits.

Gold - New Zealand Petroleum and Minerals

prospecting, mining and metallurgy from the Egyptians, and mined large quantities of gold from placer and lode deposits within their empires. Gold mining...

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