Mining & Processing

How Copper Is Mined and Processed

Copper (Cu) is a base metal with global annual production of approximately 22 million tonnes, primarily from Chile and Peru. Typical ore grades range from 0.4-1.5% Cu.

Mining Methods

Copper is extracted through the following methods, selected based on deposit type and geology:

• Open-pit mining
• Underground mining (block caving, SLC)
• In-situ leaching (SX-EW)

Ore Types and Mineralogy

The principal ore types and mineral sources for Copper include:

• Chalcopyrite - CuFeS2
• Chalcocite - Cu2S
• Bornite - Cu5FeS4
• Malachite - Cu2CO3(OH2)

Processing and Beneficiation

Following extraction, Copper ore undergoes the following processing stages:

1. Flotation concentration
2. Smelting and electrolytic refining
3. Solvent extraction-electrowinning (SX-EW)
4. Flash smelting (Outotec)

Major Mines and Production Centers

The following are key Copper mining and processing operations worldwide:

Environmental and Regulatory Considerations

Mining and processing of Copper must comply with environmental regulations governing water use, tailings management, emissions, and land rehabilitation. Increasingly stringent environmental standards are raising production costs but also driving innovation in cleaner extraction technologies. The social license to operate and community engagement have become critical factors in project development, particularly in Chile where 24% of global production is concentrated.