A common mineral hiding in plain sight could hold the key to making copper production cleaner, faster and more efficient, just as global demand for the metal surges to power the energy transition.
In a new article published in Nature Geoscience, researchers from Monash University's School of Earth, Atmosphere and Environment describe why chalcopyrite, the source of around 70 per cent of the world's copper, has remained so difficult to process, and how its hidden chemistry could be harnessed to unlock more sustainable extraction.
Despite being known for more than 300 years, chalcopyrite continues to frustrate scientists and industry alike, resisting low-temperature leaching and slowing efforts to extract copper from lower-grade ores. This inefficiency is a major bottleneck at a time when copper is critical for renewable energy systems, electric vehicles and modern infrastructure.
"Chalcopyrite is the world's primary copper mineral, but it behaves in surprisingly complex ways that have limited how efficiently we can extract copper from it," said study lead Professor Joël Brugger from the School of Earth, Atmosphere and Environment.
The research shows that this complexity is not a flaw, but an opportunity.
Chalcopyrite's crystal structure, long thought to be relatively simple, is in fact riddled with microscopic defects and trace elements such as silver, gold and nickel. These subtle variations control how the mineral reacts during processing and ultimately how much copper can be recovered.
Crucially, the team highlights how trace amounts of silver can dramatically improve copper extraction by destabilising the mineral's surface and triggering a cycle that releases copper more efficiently.
"By understanding how trace elements like silver interact with chalcopyrite at the atomic level, we can begin to design smarter, more targeted extraction methods," said co-author Dr Barbara Etschmann.
"That means less energy, fewer chemicals, and better recovery from the same resource."
Beyond mining, the implications extend into advanced materials and clean technology. Chalcopyrite's atomic structure underpins a family of semiconductors used in solar cells, photodetectors and energy conversion devices, linking geology directly to next-generation technologies.
As the world races to decarbonise, demand for copper is expected to surge dramatically, placing pressure on existing resources and processing methods.
"Meeting future copper demand isn't just about finding more deposits," Professor Brugger said. "It's about extracting what we already have more intelligently. Chalcopyrite sits at the centre of that challenge, and the solution."
The study highlights the need for cross-disciplinary innovation, bringing together Earth scientists, chemists and engineers to rethink how critical minerals are processed in a low-carbon world.
Three centuries after it was first named, chalcopyrite remains both a scientific puzzle and a strategic opportunity, one that could help power the technologies of the future while reducing the environmental cost of getting there.
