(i) Certain minerals may occur as alluvial deposits in sands of valley floors and base of hills. These deposits are called 'placer deposits'. (ii) They generally contain minerals which are not corroded by water. (iii) Gold, silver, tin and platinum are examples of some important minerals found in 'placer deposits'.
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Magnetite and Monazite are two minerals amongst many that are obtained from the placer deposits.They are present in significant amounts, and also influence the color of the placer to become shiny black due to the presence of iron.
They appear in placers due to their high density and specific gravity.
(i) Certain minerals may occur as alluvial deposits in sands of valley floors and base of hills. These deposits are called 'placer deposits'.
(ii) They generally contain minerals which are not corroded by water.
(iii) Gold, silver, tin and platinum are examples of some important minerals found in 'placer deposits'.
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