(C) Copper matte is a mixture of $Cu_2S$ and $FeS$.During the smelting of roasted copper ore (copper pyrites,$CuFeS_2$),the ore is heated with silica

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(C) Copper matte is a mixture of $Cu_2S$ and $FeS$.During the smelting of roasted copper ore (copper pyrites,$CuFeS_2$),the ore is heated with silica $(SiO_2)$ in a blast furnace.The iron oxide $(FeO)$ formed reacts with silica to form slag $(FeSiO_3)$,while the remaining $Cu_2S$ and $FeS$ form the molten copper matte.$2CuFeS_2 + O_2 \longrightarrow Cu_2S + 2FeS + SO_2$