How is copper extracted from a low-grade ore?

Leaching is the process to extract pure copper from a low-grade ore. Leaching is the process of extracting substances from a solid by dissolving them in a liquid; in this process, the ore is dissolved in liquid, but not impurities. Then the copper solution is reacted with iron to get pure copper (reduction process). Cu²⁺ + Fe → Cu(pure) + Fe²⁺