Leaching method is used to concentrate the ores of:

Gold

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Silver

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Aluminium

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All of these

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Solution

The correct option is B All of these
Leaching
It involves treatment of ore with leaching agents (like NaOH, NaCN, KCN or other reagents) due to which ore becomes soluble and their impurities remain insoluble. The leaching Process is basically done in the extraction of Al from Alumina.
$A l_{2} O_{3} + 2 N a O H \to 2 N a A l O_{2} + H_{2} O$ + Impurities

If leaching process is done in case of Ag and Au with NaCN (0.4 to 0.8%) then the process is called as Mac-Arthur Forrest cyanide Process.
$A g + N a C N \to N a A g (C N)_{2} +$ Impurities
$A u + N a C N \to N a A u (C N)_{2} +$ Impurities

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