A black mineral A on treatment with dilute sodium cyanide solution

(i) A black mineral A on treatment with dilute sodium cyanide solution in the presence of air gives a clear solution B and C.
(ii) The solution of B on reaction with zinc gives precipitate of metal D.
(iii) D dissolved in dil. $HNO_{3}$ and the resulting solution gives a white precipitate E with dil. HCl.
(iv) E on fusion with sodium carbonate gives D. Identify AtoE and give chemical equations.