Key Takeaways
- China metals overcapacity is forcing Western smelters to shut down.
- Processing fees have turned negative for copper and zinc.
- Strategic by-product recovery is at risk.
- Policymakers face a stark choice: intervene or cede control to Beijing.
LONDON—Glencore’s Mount Isa copper smelter in Australia is preparing to shut within weeks, the latest casualty in a widening crisis driven by China metals overcapacity. From Europe to the Pacific, plants once regarded as industrial anchors are buckling under Beijing’s relentless expansion of processing capacity, raising fears about the security of critical mineral supply chains.
Industry leaders warn that the collapse in processing fees is not merely cyclical. It reflects China’s strategy to dominate base metals the same way it already controls rare earths.
Margins Collapse as China Metals Overcapacity Spreads
The scale of the downturn has stunned industry veterans. This year, Chinese smelters struck a benchmark contract with Chile’s Antofagasta that set copper conversion fees to zero—a reversal of decades of pricing. In spot markets, some smelters have paid miners just to keep furnaces running.
“It’s a margin environment where you’re effectively subsidizing the producer,” said Andrew Michelmore, former chief executive of Zinifex.
Zinc treatment charges also fell below zero before recovering modestly. Despite global zinc mine production rising 5.1% in early 2025, China metals overcapacity has steadily eroded profitability across the sector.
China Metals Overcapacity Drives Dominance in Zinc and Aluminium
China’s refined zinc output has climbed from a third of the global market in 2007 to nearly half today, according to the World Bureau of Metal Statistics. In aluminium, Chinese producers control about 60% of primary supply. Even state-imposed capacity limits have not stopped companies from building new smelters offshore, particularly in Indonesia.
Chinese-backed plants there now supply roughly half of the world’s nickel, driving a glut that has halved prices and forced more than 500,000 tons of Western nickel capacity offline since 2020.
“This is not just market forces,” said Lisa Sachs, director of Columbia University’s Center on Sustainable Investment. “It’s a deliberate industrial policy designed to secure leverage.”
| Metal | China’s Global Share (2024) | Western Plant Closures |
|---|---|---|
| Zinc | ~50% | Multiple Europe plants since 2022 |
| Aluminium | ~60% | Tomago, other EU facilities |
| Nickel | ~50% (Indonesia production) | 500,000 tons since 2020 |
Strategic Assets at Risk from China Metals Overcapacity
Smelters are vital not only for producing base metals but also for recovering by-products such as gallium, tellurium, and antimony—materials essential to semiconductors and defense.
“If we lose domestic smelting, we surrender the capacity to produce critical metals we don’t even think about until there’s a crisis,” said Morgan Bazilian, director of the Payne Institute at the Colorado School of Mines.
Australia faces this dilemma acutely. The government is under pressure to support Rio Tinto’s Tomago aluminium smelter and Nyrstar’s Port Pirie zinc plant, alongside Glencore’s Mount Isa operation.
Power Costs Amplify the China Metals Overcapacity Crisis
Europe’s smelters face an added challenge: soaring energy costs since Russia’s invasion of Ukraine. Meanwhile, Chinese operators benefit from subsidized power and vertically integrated structures that spread losses across the supply chain.
“The playing field is simply not level,” said Farid Ahmed, a senior analyst at Wood Mackenzie. “Chinese producers can withstand negative margins indefinitely. Western smelters can’t.”
A Strategic Choice in the Era of China Metals Overcapacity
Some Western governments are debating whether smelting warrants the same public support afforded to semiconductor fabrication plants. Advocates warn that inaction will deepen dependence on Chinese supply chains just as the energy transition accelerates.
“We’ve been warning about this scenario for years,” said Karen Hudson-Edwards, mining professor at the University of Exeter. “It’s here now. The question is whether policymakers will step up.”
Until they do, China metals overcapacity will continue reshaping global trade—and entrenching China’s control over the metals that power modern economies.
