Technology Targets a Revival in Copper Refining

Why It Matters

Copper is critical for electrification, so losing domestic smelting could erode Australia’s export revenues and increase reliance on overseas processors. A scalable, low‑energy alternative like Banksia’s could preserve domestic value chains if it proves economically competitive.

Key Takeaways

• Banksia aims to replace smelting with chloride hydrometallurgy
• A$5 m (≈US$3.3 m) grant funds pilot plant by 2028
• Mount Isa smelter faces closure without continued government support
• Hydrometallurgy reduces emissions but raises corrosion and reagent costs
• Energy prices in Queensland triple national rates, challenging new tech viability

Pulse Analysis

Australia sits on more than 10% of the world’s copper reserves, yet its processing chain is increasingly unbalanced. While mining output remains robust, smelting capacity is contracting, leaving the country dependent on overseas hubs in China, Japan and South Korea for the high‑temperature conversion of concentrate to anode copper. This structural gap is magnified by soaring global copper prices—hovering between $8,500 and $13,000 per tonne in 2025‑26—and by energy costs in north‑west Queensland that are roughly three times higher than the national average. The result is a strategic vulnerability: without a domestic smelting solution, Australia risks losing downstream value and ceding market influence as electrification drives demand.

Enter Banksia Minerals, a Brisbane‑based start‑up leveraging University of Queensland research to commercialise a chloride‑based hydrometallurgical route. By dissolving sulphide concentrates in saline solution and recovering copper via electrowinning, the process eliminates the need for high‑temperature furnaces, cutting emissions and potentially lowering energy consumption. The breakthrough lies in achieving smooth copper plating from a chloride leach, a hurdle that has stalled commercial adoption for decades. Backed by a A$5 m (≈US$3.3 m) ARENA grant, Banksia targets a pilot plant by 2028, aiming to demonstrate scalability and cost parity. However, the technology introduces new challenges: corrosive environments demand expensive materials, reagent costs add to operating expenses, and the process still depends on continuous electricity—an issue in a region where power is costly.

If Banksia can prove its economics, the implications extend beyond Australia. A modular, low‑carbon copper processing unit could enable smaller mines to stay on‑site, reducing transport costs and fostering regional supply‑chain resilience. Retrofitting existing infrastructure, such as the Glencore Townsville refinery, could lower capital outlays compared with building new smelters, offering a pragmatic pathway for jurisdictions seeking to regionalise critical mineral processing. Nonetheless, the technology must compete with entrenched, large‑scale smelting hubs that benefit from economies of scale and cheaper energy. Government support, like the A$600 m (≈US$396 m) aid package that kept Mount Isa operational until 2028, may be essential to bridge the transition. Ultimately, the success of hydrometallurgy will hinge on its ability to deliver consistent, market‑grade copper at a competitive total cost of ownership, reshaping Australia’s role in the global copper value chain.