Copper concentrate pricing slips into the shadows
XLB•Negative spot treatment charges and increasingly bespoke contract terms are making copper concentrate pricing harder to interpret. This year's benchmark terms were set at zero, down from $21.25 per ton and 2.5 cents per pound in 2025.
1. Charges lose clarity
Spot treatment and refining charges have turned negative this year, but they no longer provide a reliable measure of copper concentrate supply. The article says China's rapid smelter expansion is also influencing charges, while smelters can earn revenue from gold, silver and sulfur by-products.
2. Deals add complexity
Recent spot tenders included a negative treatment charge of $310 per metric ton for 10,000 tons from Antofagasta's Centinela mine and a charge in the minus $370s for material from Teck Resources' Highland Valley mine. Contract terms can also adjust payable ratios, by-product credits, impurity penalties and buy-backs of refined metal or sulfuric acid.
3. Benchmark fragments
This year's benchmark terms, negotiated between Antofagasta and Chinese smelters, were set at zero, compared with $21.25 per ton and 2.5 cents per pound in 2025. Japanese smelters have indicated they secured different terms: Sumitomo Metal Mining described its 2026 terms as in the double-digit range, without disclosing exact figures. Negotiations for next year's benchmark have begun.
