Oxidation of ore is involved in:

Oxidation of ore is involved in the roasting of galena.

A large and tiny exothermic DTA peak at 460°C was seen during the oxidation of galena to lead sulphate during roasting. A minor exothermic peak indicates the result of the interaction between galena and lead sulphate, which formed ${\mathrm{Pb}}_{{\mathrm{SO}}_4}\cdot \mathrm{PbO}$ at ${580}^{\circ }\mathrm{C}$ 

Hence, option C is correct.