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- Q2141583 subject Q6984762.
- Q2141583 subject Q8703153.
- Q2141583 abstract "In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation 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 used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, and paleoplacers.Placer materials must be both dense and resistant to weathering processes. To accumulate in placers, mineral particles must be significantly denser than quartz (whose specific gravity is 2.65), as quartz is usually the largest component of sand or gravel. Placer environments typically contain black sand, a conspicuous shiny black mixture of iron oxides, mostly magnetite with variable amounts of ilmenite and hematite. Valuable mineral components often occurring with black sands are monazite, rutile, zircon, chromite, wolframite, and cassiterite.".
- Q2141583 thumbnail Black_Sands.jpg?width=300.
- Q2141583 wikiPageWikiLink Q103223.
- Q2141583 wikiPageWikiLink Q1038.
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- Q2141583 wikiPageWikiLink Q10972285.
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- Q2141583 wikiPageWikiLink Q1174791.
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- Q2141583 wikiPageWikiLink Q190444.
- Q2141583 wikiPageWikiLink Q190729.
- Q2141583 wikiPageWikiLink Q191222.
- Q2141583 wikiPageWikiLink Q205768.
- Q2141583 wikiPageWikiLink Q223995.
- Q2141583 wikiPageWikiLink Q2449835.
- Q2141583 wikiPageWikiLink Q320603.
- Q2141583 wikiPageWikiLink Q34038.
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- Q2141583 wikiPageWikiLink Q47521.
- Q2141583 wikiPageWikiLink Q5283.
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- Q2141583 wikiPageWikiLink Q575449.
- Q2141583 wikiPageWikiLink Q6185405.
- Q2141583 wikiPageWikiLink Q677.
- Q2141583 wikiPageWikiLink Q6984762.
- Q2141583 wikiPageWikiLink Q716.
- Q2141583 wikiPageWikiLink Q8703153.
- Q2141583 wikiPageWikiLink Q897.
- Q2141583 comment "In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation 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 used in the early years of many gold rushes, including the California Gold Rush.".
- Q2141583 label "Placer deposit".
- Q2141583 depiction Black_Sands.jpg.