Cyanide process is used for the extraction of
As we learnt in
In this process we use suitable agent which react with ore to form water soluble complex while impurities are insoluble
Ag2S +NaCN Na [Ag (CN)2]
Na [Ag (CN)2] + Zn Na2 [Zn(CN)4] +Ag
Ag forms a water soluble complex with cyanide while the impurities are insoluble .