Copper treatment charges hit zero for the first time ever as smelter capacity outstrips mine supply

Summary

The 2026 annual copper concentrate benchmark, agreed between Chilean miner Antofagasta and leading Chinese smelters in December 2025, settled at zero dollars per tonne, the lowest ever set in the history of annual TC/RC negotiations. The previous benchmark was $21.25/t. By late March 2026 spot treatment charges had turned negative, reaching around -$70/t, meaning smelters were paying miners for concentrate rather than receiving processing fees. The root cause is a structural imbalance: China added roughly 2 million tonnes of new smelting capacity over 2024-2025 while global copper mine supply growth stalled, creating a 650,000-850,000t concentrate shortfall. The Chinese government responded by halting a further 2 million tonnes of planned smelter build-out and China's top smelters agreed to cut production 10%. LME copper briefly exceeded $14,500/t intraday in January 2026 before settling near $13,086/t by June. By-product revenue from gold, silver and sulphuric acid has kept many smelters solvent despite the zero processing fee.

The split

Mining companies and their shareholders read zero TC/RCs as a validation of the copper bull thesis: mine supply is genuinely scarce and the price signal is real. Chinese smelters and Beijing policymakers interpret it as a self-inflicted wound from overinvestment, now being corrected through coordinated output cuts. IEA and Columbia SIPA raise a strategic concern: if Western-aligned smelters cannot survive zero or negative TC/RCs (they receive no by-product credit, unlike Chinese smelters with gold-rich South American ore streams), Western smelting capacity could permanently exit the market, deepening dependence on China for refined copper. The Fastmarkets floor-cap negotiation posture from Freeport suggests miners are prepared to contract differently in future years to share upside with smelters and preserve the processing relationship.

By the numbers

• $0/t, 2026 annual copper concentrate treatment charge benchmark (Antofagasta-China smelter).
• -$70/t, approximate spot TC/RC reached in late March 2026.
• $21.25/t, 2025 benchmark TC/RC (the previous record low before 2026).
• 650,000-850,000t, estimated 2026 global copper concentrate shortfall.
• $14,500/t, intraday copper price peak (January 2026, LME).
• $13,086.50/t, LME copper 3-month close as of June 24, 2026.
• ~10%, production cut agreed by China's top copper smelters in 2026.

Why it matters

Treatment and refining charges are the oxygen of the copper value chain: negative TCs transfer rent from processors to miners and signal that smelter overcapacity relative to mine supply has reached an extreme. The 2026 setting at zero is historic and, if sustained, will permanently impair smelter economics globally, not just in China, reshaping where refining capacity survives long-term. Copper is essential for electric vehicles, power grids, data centres and defence systems, all facing accelerating demand. The concentrate tightness also exposes the role of Cobre Panama: the 330,000t/year of production lost since 2023 accounts for a meaningful share of the global shortfall.

What to watch

• Whether Chinese smelter output cuts, combined with halted new capacity, rebalance TC/RCs toward positive territory by 2027.
• Cobre Panama stockpile processing: 70,000t of copper could alleviate spot concentrate tightness if approved quickly.
• Western allied copper-smelting capacity: can it survive negative TC/RCs, or does more exit?
• The 2027 annual TC/RC benchmark negotiation as the leading indicator of market balance.