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placer deposit

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См. также в других словарях:

  • Placer deposit — In geology, a placer deposit or placer is an accumulation of valuable minerals formed by deposition of dense mineral phases in a trap site. The name is from the Spanish word placer , meaning alluvial sand . Types of placer deposits include… …   Wikipedia

  • 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… …   Universalium

  • Placer mining — (pronounced plass er ) refers to the mining of alluvial deposits for minerals. This may be done by open pit (also called open cast mining) or by various forms of tunneling into ancient riverbeds. Excavation may be accomplished using water… …   Wikipedia

  • placer mining — ☆ placer mining [plas′ər ] n. mining of placer deposits by washing, dredging, or other hydraulic methods * * * Oldest method of recovering gold from alluvial deposits. It takes advantage of gold s high density, which causes it to sink more… …   Universalium

  • Placer — may refer to one of the following:*Placer deposit *Placer sheep *Placer miningGeographical names: * Placer, Masbate, Philippines * Placer, Surigao del Norte, Philippines * Placer County, California, United States …   Wikipedia

  • deposit — /di poz it/, v.t. 1. to place for safekeeping or in trust, esp. in a bank account: He deposited his paycheck every Friday. 2. to give as security or in part payment. 3. to deliver and leave (an item): Please deposit your returned books with the… …   Universalium

  • placer — placer1 /plas euhr/, n. Mining. 1. a surficial mineral deposit formed by the concentration of small particles of heavy minerals, as gold, rutile, or platinum, in gravel or small sands. 2. the site of a form of mining (placer mining) in which a… …   Universalium

  • placer — I plac•er [[t]ˈplæs ər[/t]] n. 1) min mir a natural concentration of heavy metal particles, as gold or platinum, in sand or gravel deposited by rivers or glaciers 2) min the site of a form of mining(plac′er min ing)in which a placer deposit is… …   From formal English to slang

  • Placer, Surigao del Norte — Placer is a 4th class municipality in the province of Surigao del Norte, Philippines. According to the 2000 census, it has a population of 21,542 people in 4,237 households.BarangaysPlacer is politically subdivided into 20 barangays. * Amoslog *… …   Wikipedia

  • placer — ► NOUN ▪ a deposit of sand or gravel in the bed of a river or lake, containing particles of valuable minerals. ORIGIN Latin American Spanish, deposit, shoal …   English terms dictionary

  • Placer — Plac er, n. [Sp.] 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.] [1913 Webster] …   The Collaborative International Dictionary of English

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