What kind of reaction is this

4Au(s) + 8(NaCN)(aq) +O2(g) + 2H2O(l) --> 4NaAu(CN)2(aq) + 4NaOH(aq)

and this

2Na[Au(CN)2](aq)+Zn¬(s) —> 2Au(s) + 2NaCN(aq) + Zn(CN)2(aq)

both of these reactions are used to extract and recover gold

Both are oxidation reduction (or "redox") reactions.