The extraction of which of the following metals involves bessemerisation?

In a Bessemer converter, copper pyrites are oxidised to FeO and $\mathrm{Cu}_2 \mathrm{O}, \mathrm{FeO}$ is slagged off. $\mathrm{Cu}_2 \mathrm{O}$ reacts with $\mathrm{Cu}_2 \mathrm{~S}$ left unoxidised to give Cu . $2 \mathrm{Cu}_2 \mathrm{~S}+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{Cu}_2 \mathrm{O}+2 \mathrm{SO}_2 \uparrow$ $2 \mathrm{Cu}_2 \mathrm{O}+\mathrm{Cu}_2 \mathrm{~S} \longrightarrow 6 \mathrm{Cu}+\mathrm{SO}_2 \uparrow$ Thus, extraction of Cu involves bessemerisation.