Which one of the following minerals islargely derived from placer deposits ?[2011(T-2)]a)Magnesiumb)Goldc)Iron ored)BromineCorrect answer is option 'B'. Can you explain this answer?

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Which one of the following minerals islargely derived from ‘placer deposits’ ?

[2011(T-2)]

a)
Magnesium
b)
Gold
c)
Iron ore
d)
Bromine

Correct answer is option 'B'. Can you explain this answer?

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Which one of the following minerals islargely derived from placer depo...

Answer:

Placer deposits:

Placer deposits are concentrations of minerals that have been transported and accumulated by flowing water.

They are often found in river channels or on the beds of ancient rivers.

Placer deposits are formed by the process of erosion, transportation, and deposition of minerals.

These deposits are typically composed of heavy minerals, such as gold, platinum, tin, and diamonds, which are denser than the surrounding rocks and sediment.

Minerals derived from placer deposits:

Gold is the mineral that is largely derived from placer deposits.

Gold is often found in rivers and streams, where it has been eroded from surrounding rocks and transported by water.

Due to its density, gold settles in the streambeds and is easily concentrated in placer deposits.

Miners have been extracting gold from placer deposits for thousands of years.

Other options:

Magnesium is not largely derived from placer deposits.

Iron ore is typically mined from large, underground deposits.

Bromine is not largely derived from placer deposits.

Therefore, the correct answer is B: Gold.

Answered by Dr Manju Sen · View profile

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Which one of the following minerals islargely derived from placer depo...

Gold

Placer deposits are concentrations of heavy minerals that have been concentrated by gravity separation during sedimentary processes. Gold is largely derived from placer deposits because it is a heavy mineral that tends to accumulate in riverbeds, streams, and beaches due to its high density.

Characteristics of Gold in Placer Deposits:
- Gold is resistant to weathering and erosion, which allows it to remain in sedimentary environments for long periods.
- It is often found in association with other heavy minerals like magnetite and pyrite.
- Gold nuggets and flakes can be easily separated from the surrounding sediment through panning or sluicing techniques.

Extraction of Gold from Placer Deposits:
- Miners use various methods such as dredging, sluicing, and hydraulic mining to extract gold from placer deposits.
- Panning is a common technique where miners swirl sediment and water in a pan to separate gold particles from the surrounding material.
- Sluicing involves using a box-like structure with riffles to trap gold particles as sediment-laden water flows through.

Significance of Placer Gold:
- Placer gold deposits have been a major source of gold production throughout history.
- They are relatively easy and inexpensive to mine compared to hard rock mining.
- Many famous gold rushes, such as the California Gold Rush of 1849, were based on the discovery of placer gold deposits.

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