Asked by: Bradford Timonov
asked in category: General Last Updated: 18th June, 2020

How are placer deposits mined?

Placer mining /ˈplæs?r/ 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.

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Correspondingly, what is placer mining method?

Placer mining, ancient method of using water to excavate, transport, concentrate, and recover heavy minerals from alluvial or placer deposits. Placer mining takes advantage of gold's high density, which causes it to sink more rapidly from moving water than the lighter siliceous materials with which it is found.

Additionally, what is found in placer deposit? Placer deposit. Minerals that form placer deposits have high specific gravity, are chemically resistant to weathering, and are durable; such minerals include gold, platinum, cassiterite, magnetite, chromite, ilmenite, rutile, native copper, zircon, monazite, and various gemstones.

Consequently, where are placer deposits found?

Alluvial placers are those formed in river or stream sediments. Typical locations for alluvial gold placer deposits are on the inside bends of rivers and creeks; in natural hollows; at the break of slope on a stream; the base of an escarpment, waterfall or other barrier.

Why are placer deposits important?

a placer deposit or placeris an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. 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.

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