tenir à placer - translation to Αγγλικά
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tenir à placer - translation to Αγγλικά

ACCUMULATION OF VALUABLE MINERALS FORMED BY GRAVITY SEPARATION DURING SEDIMENTARY PROCESSES
Placer (deposit); Placer deposits
  • Density sorting of heavy minerals during sediment transport forming placers between ripple marks
  • [[Heavy minerals]] (black) forming placers along [[ripple mark]]s.

tenir à placer      
drag in

Ορισμός

Placer
·noun One who places or sets.
II. Placer ·noun 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.

Βικιπαίδεια

Placer deposit

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 used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers.

Placer materials must be both dense and resistant to weathering processes. To accumulate in placers, mineral particles must have a specific gravity above 2.58.

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. Early mining operations were likely a result of placer deposits as they were easily accessible and potential size. The events known as gold/diamonds rushes were caused by placer deposits and have proved to be plentiful.