There have been several efforts to develop alternative gold extract...

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There have been several efforts to develop alternative gold extraction processes which could replace this one. Why ?
\( \mathrm{P} \)
(A) Sodium cyanide solutions corrode mining
W machinery
(B) Sodium cyanide escapes into ground water and produces hydrogen cyanide which is toxic to many animals.
(C) Gold obtained by this process is not pure.
(D) The amount of gold in aluminosilicate rocks is very less.
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