Hydrometallurgy is generally used in the case of low grade ores, which cannot be concentrated economically. If true enter 1 else 0.

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Hydrometallurgy is generally used in the case of low grade ores, which cannot be concentrated economically. The powered ore is first treated with an aqueous solution of a suitable chemical whereby the metal is obtained in the form of its soluble salts leaving behind gangue particles (leaching).
$C u O + H_{2} S O_{4} \to C u S O_{4} + H_{2} O$
$A g C l + 2 N a C N \to N a [A g (C N)_{2}] + N a C l$
$A g_{2} S + 4 N a C N ⇌ 2 N a [A g (C N)_{2}] + N a_{2} S$

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