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Placer mining - Wikipedia

2019-4-23 · Placer mining[1] /ˈplæsər/[2] is the mining of stream bed (alluvial) deposits for minerals. This may be done by open-pit (also called open-cast mining) or by various surface excavating equipment or tunnelling equipment. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often

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Placer Deposits | SpringerLink

Griffith designated all such accumulations alluvial deposits and stated that they are known as placer deposits in the USA and Canada. In many European descriptions they are described as alluvial deposits.

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What Are Placer Ore Deposits? | Sciencing

Throughout human history, placer deposits have been mined for treasures -- gold, platinum diamonds and other gems. The ancient Romans got most of the empire''s gold from placer mines throughout the empire. Placer deposits were at the center of the great gold rushes of

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Placer | Define Placer at Dictionary

A surface deposit of minerals, such as gold or magnetite, laid down by a river. The minerals are usually concentrated in one area because they are relatively heavy and therefore settle out of the river''s currents more quickly than lighter sediments such as silt and sand. ♦ The extraction of minerals from placers, as by panning, washing, or dredging, is called placer mining.

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Placer mining | Britannica

2  · Placer mining, ancient method of using water to excavate, transport, concentrate, and recover heavy minerals from alluvial or placer deposits.Examples of deposits mined by means of this technique are the gold-bearing sands and gravel that settle out from rapidly moving streams and rivers at points where the current slows down.

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Placer Deposits | SpringerLink

Placer deposits are accumulations of dense “heavy” minerals (ρ > 2.85 g cm −3), which are enriched in comparison to the common “light” minerals (ρ < 2.65 g cm −3) like quartz and feldspar.The placer minerals must be mechanically and chemically stable to survive weathering and transport in rivers and along the beach.

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What are ''placer deposits''? - Quora

Placer deposits are found in mountain streams. Much of the gold mining in Colorado was done this way. Large dredges would dig deep into the stream beds and the large cobbles and stones would be separated out until you got to the gold bearing sands.

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Placer deposit | geology | Britannica

2019-4-25 · Placer deposit: 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 lighter matrix. Thus the heavy minerals

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Mindesea | Marine Placer Deposits

Marine Placer Deposits comprise detrital heavy metallic minerals and gemstones, eroded from, usually igneous, source rocks on land and transported to sea, mostly by rivers. Thereby, placer deposits are concentrated by water motions (waves, tides, currents).

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Alluvial placer deposits, geology, exploration, mining

2011-10-27 · Note that placer deposits can be worked whose gold content is as low as 0.1 ppm. The pay streaks of placer deposits may rest on or near bedrock or on some stratum above bedrock. The bedrock in placer deposits is commonly referred to as the ''true bottom'', although the term is little used today.

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Prospecting Placer Gold Deposits

2019-4-24 · Prospecting for placer gold, except perhaps in the case of buried placers, is the simplest form of prospecting. Gold, platinum, and tin are the principal metallic minerals won from placers, but gold (alloyed with varying percentages of silver) is the only metal that has been recovered in commercially important quantities from placers in the United States.

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Placer deposits form when

Placer deposits originate in an alluvial environment, and are the result of natural gravity separation of material according to its density. Gold (say), originally entrained in the rock mass, is

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Geology of Placer Deposits, Part 1 - GOLD NUGGET

2019-4-22 · Hey I just put up another video, The Geology of Placer Deposits, Part 1 (it will be part 1 of 3) This one focuses on different types of placer deposits and how the gold concentrates naturally - then also about finding those natural concentration spots. I do think it has a lot of hints, informatio

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Placer mining | Britannica

2  · Placer mining, ancient method of using water to excavate, transport, concentrate, and recover heavy minerals from alluvial or placer deposits.Examples of deposits mined by means of this technique are the gold-bearing sands and gravel that settle out from rapidly moving streams and rivers at points where the current slows down.

Read more
Geology of Placer Deposits, Part 1 - GOLD NUGGET

2019-4-22 · Hey I just put up another video, The Geology of Placer Deposits, Part 1 (it will be part 1 of 3) This one focuses on different types of placer deposits and how the gold concentrates naturally - then also about finding those natural concentration spots. I do think it has a lot of hints, informatio

Read more
What are ''placer deposits''? - Quora

Placer deposits are found in mountain streams. Much of the gold mining in Colorado was done this way. Large dredges would dig deep into the stream beds and the large cobbles and stones would be separated out until you got to the gold bearing sands.

Read more
Placer Deposits | SpringerLink

Griffith designated all such accumulations alluvial deposits and stated that they are known as placer deposits in the USA and Canada. In many European descriptions they are described as alluvial deposits.

Read more
Placer Deposits - Mining Fundamentals

2011-4-1 · • Placer Deposit Types • Environments of Placer Mineral Occurrence • Exploration Methods in Shallow Waters • Sand & Gravel, Mineral Aggregates – Sources and Uses of Major US Nonmetallic Construction Raw Materials – Projected US Sand & Gravel Demand – Sources & Fates of Offshore Sand & Gravel Deposits • Exploitation (Mining) Methods

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PLACER DEPOSITS Sub-committee Meers

2018-3-28 · Placer deposits include several different types of commodities and a range of geological environments. The three deposit types discussed here; mineral sands, placer gold and alluvial diamonds, are considered to have specific technical issues that require specialized knowledge. MINERAL SANDS Mineral sands are deposits of ilmenite and other heavy

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Mindesea | Marine Placer Deposits

Marine Placer Deposits comprise detrital heavy metallic minerals and gemstones, eroded from, usually igneous, source rocks on land and transported to sea, mostly by rivers. Thereby, placer deposits are concentrated by water motions (waves, tides, currents).

Read more
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