Question

Which of the following ores is concentrated by chemical leaching method?

• A. Cinnabar
• B. Argentite
• C. Copper pyrites
• D. Galena

Answer 1

Answer: (B)

Argentite

Answer 2

Ag and Au are extracted from their native ores by leaching (Mac – Arthur forest cyanide process).

$4M + 8CN^{-} + 2H_{2}O + O_{2} \rightarrow 4\lbrack M(CN)_{2}\rbrack^{-} + 4OH^{-}$ (where M = Ag or Au)