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- Placer_mining abstract "Placer mining (/ˈplæsər/ or /ˈpleɪsər/) is the mining of alluvial deposits for minerals. This may be done by open-pit (also called open-cast mining) or by various surface excavating equipment or tunneling equipment.Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often found in alluvial deposits—deposits of sand and gravel in modern or ancient stream beds, or occasionally glacial deposits. The metal or gemstones, having been moved by stream flow from an original source such as a vein, is typically only a minuscule portion of the total deposit. Since gems and heavy metals like gold are considerably more dense than sand, they tend to accumulate at the base of placer deposits.The containing material may be too loose to safely mine by tunneling, though it is possible where the ground is permanently frozen. Where water under pressure is available, it may be used to mine, move, and separate the precious material from the deposit, a method known as hydraulic mining, hydraulic sluicing or hydraulicking.".
- Placer_mining thumbnail Henry_Sandham_-_The_Cradle.jpg?width=300.
- Placer_mining wikiPageExternalLink minecache.com.
- Placer_mining wikiPageID "293076".
- Placer_mining wikiPageRevisionID "606357870".
- Placer_mining hasPhotoCollection Placer_mining.
- Placer_mining subject Category:Economic_geology.
- Placer_mining subject Category:Gold_mining.
- Placer_mining subject Category:History_of_mining.
- Placer_mining subject Category:Surface_mining.
- Placer_mining comment "Placer mining (/ˈplæsər/ or /ˈpleɪsər/) is the mining of alluvial deposits for minerals. This may be done by open-pit (also called open-cast mining) or by various surface excavating equipment or tunneling equipment.Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often found in alluvial deposits—deposits of sand and gravel in modern or ancient stream beds, or occasionally glacial deposits.".
- Placer_mining label "Placer mining".
- Placer_mining sameAs m.01qvlc.
- Placer_mining sameAs Q17075164.
- Placer_mining sameAs Q17075164.
- Placer_mining wasDerivedFrom Placer_mining?oldid=606357870.
- Placer_mining depiction Henry_Sandham_-_The_Cradle.jpg.
- Placer_mining isPrimaryTopicOf Placer_mining.
