Which reducing agent is employed to get copper from the leached low grade copper ore?

Q. At a site low grade copper ores are available, and zinc and iron scraps are also available. Which of the two scraps would be more suitable for reducing the leached copper ore and why?

Q.

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

Q. What is the process of leaching in case of low grade copper ores?

Q. Assertion :Copper sulfate can also be produced by slowly leaching low grade copper ore in air. Reason: Bacteria may be used to hasten the process.

Q. How is copper extracted from low grade copper ores?