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[AJAZ31]

The process may work with Ag, but there is no AuS... Au does not have a salt of any kind... such as a AuS or AuSO4... and reacts with nothing... It starts as Au and ends with Au... all you have to do is pick it out of the dirt...

3MeS (s)+ 2HNO3 (aq) + 3H2SO4 (aq) ? 3MeSO4 + 3S° (s) + 2NO (g) + 4H2O

The NO+ then reacts with the mineral and oxidizes the sulphide to sulphur.
2MeS (s) + 4NO+ (aq) ? 2Me+2 (aq) + 2S° + 4NO (g)

Au is soluble only, as a complex with cyanide.