2 CuIIFeS2-II + 2 SiO2-II + 5 O20 2 FeSiO3-II + 2 Cu0 + 4 SIVO2-II

This is an oxidation-reduction (redox) reaction:

2 CuII + 4 e- 2 Cu0 (reduction)

4 S-II - 24 e- 4 SIV (oxidation)

10 O0 + 20 e- 10 O-II (reduction)

Change the oxidation states