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Why partial roasting of sulphide ore is ...

Why partial roasting of sulphide ore is done in the metallurgy of copper ?

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Partial roasting of sulphide ore forms some oxide which then reacts with the remaining sulphide ore t form copper metal by self reduction of the oxide and sulphide as :
`2Cu_2 S + 3O_2 to 2Cu_2 O + 2SO_2`
`2Cu_2 O + Cu_2 S to 6Cu + SO_2 `
Thus , to bring about self reduction process, sulphide ore of copper is partially roasted to `Cu_2 O`.
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