CuIIS-II + 8 HNVO3 CuI(NVO3) + H2SVIO4 + 7 NIVO2 + 3 H2O

This is an oxidation-reduction (redox) reaction:

CuII + e- CuI (reduction)

S-II - 8 e- SVI (oxidation)

7 NV + 7 e- 7 NIV (reduction)

CuS is an oxidizing agent, CuS is a reducing agent, HNO3 is an oxidizing agent.