Extraction of copper from copper pyrite $\left({\mathrm{CuFeS}}_2\right)$ involves:

Extraction of copper from copper pyrite $\left({\mathrm{CuFeS}}_2\right)$is done by the froth flotation process in which iron is removed as slag $\left({\mathrm{FeSiO}}_3\right)$.

Initially, the ore is crushed and ground into a fine powder. Since the ore is a supplied ore, froth-floatation is used to concentrate it.

Copper blisters are produced when the combination of ${\mathrm{Cu}}_2\mathrm{S}$ and ${\mathrm{Cu}}_2\mathrm{O}$ undergoes self-reduction; the blisters are caused by the development of ${\mathrm{SO}}_2$ and other gases.