Au and Cu separation from a metallic bar

[pinkrose]

Wich reactions occours in the following steps?
data:(g/mol):H=1; N=14; O=16; Cu=64; Zn=65; Au=197;
step 1
metallic bar + HNO₃ --------- solution A + solid X
step 2
solution A + solid X ----- filtration-----solution A solid X
step 3
solution A + Zn(powder) -------- solution B + solid Y
step 4
solution B + solid Y -------filtration ------- solution B solid Y
Thanks!!!

[pinkrose]

this question is about separating mixtures actually, so I think it wasn´t supposed to have any chemical reaction, but there´s no way.here´s my suggestion:
step 1
HNO₃ + metallic bar(Cu/Au) ------solA Cu(NO₃)₂ + solidX (Au)
step 2
solA Cu(NO₃)₂ + solidX (Au)----filtration----solA Cu(NO₃)₂ solidX (Au)
step 3
solA Cu(NO₃)₂ + Zn----solB Zn(NO₃)₂ + solidY (cu)
step 4
solB Zn(NO₃)₂ + solidY (Cu)----filtration----solB Zn(NO₃)₂ solidY (cu)

[Zedekiah]

That looks pretty solid to me.

Dissolve in nitric acid, filter, add zinc to the copper nitrate solution and then filter the copper.