How is leaching carried out in case of low grade copper ores?

Explanation

Leaching in case of low grade copper is carried out by reacting with acid like `H_(2)SO_(4)` in the presence of air when copper is oxidised to `Cu^(2+)` ions which pass into the solution. For example.
`2 Cu(s)+2H_(2)SO_(4)(aq)+O_(2)(g)to 2CuSO_(4)(aq)+2 H_(2)O(l)`
or `Cu+2H^(+) (aq)+1//2O_(2)(g)to Cu^(2+))aq)+H_(2)O(l)`