Copper tc/rc benchmark talks called toughest year yet as spot charges plunge to -$90/t

The annual copper treatment and refining charge (TC/RC) benchmark negotiations for the 2027 contract year are being described by industry participants as the most contentious in memory. The talks, which typically set the template for concentrate treatment fees between major miners and smelters, are taking place against the backdrop of a market where spot TCs have been deeply negative for months — currently ranging from -$66/t to -$90/t depending on the specific grade and origin of concentrate. (Source: Fastmarkets, CRU)

The current impasse reflects a fundamental structural imbalance. Global smelting capacity — particularly in China, which expanded by roughly 11% in 2025 alone — has grown far faster than mine supply. Mine disruptions including the permanent closure of Cobre Panama, output issues at Freeport's Indonesian operations, and Kamoa-Kakula's ramp-up delays have tightened concentrate availability precisely when smelters need it most. China accounts for roughly 48% of global smelting capacity but only 8% of concentrate production, creating an inherent structural deficit of feedstock. (Source: Columbia University SIPA)

The 2026 annual benchmark was set at $0/mt — the first zero in history — when Chilean miner Antofagasta and a Chinese smelter agreed terms in December 2025. The previous year's benchmark of approximately $20-25/mt was itself a record low at the time. The move to zero signaled that the industry's traditional pricing mechanism — where smelters earn a processing fee that historically covered roughly one-third of their revenue — had completely broken down. (Source: Sprott, CRU)

Spot market conditions have since deteriorated far beyond zero. By early 2026, spot TCs had fallen to negative -$51/t, and the Iran conflict in the Gulf accelerated the decline. CRU's weekly spot assessment hit -$120/mt at its trough. The economics are brutal: a smelter processing 1 million tonnes of concentrate annually at a spot TC of -$80/t is effectively paying miners $80 million for the right to process their ore — a complete inversion of the traditional revenue model. (Source: CRU, Sprott)

The response is already reshaping the industry. China's top smelters have cut output by more than 10% and Beijing has halted approvals for new smelting capacity. But the crisis extends beyond China. Japanese smelters, including Sumitomo Metal Mining, face a 2027 negotiating environment where negative benchmarks may become the norm. South Korean and European smelters, operating at even higher cost bases, face existential margin pressure. The risk is a wave of non-Chinese smelter curtailments that would further tighten refined copper supply at a time when the market is already in deficit. (Source: Columbia SIPA, Sprott)

The 2027 benchmark talks are contentious because the baseline has shifted. Miners, flush with leverage from scarce concentrate, are pushing for continued zero or negative TC/RC terms. Smelters, facing mounting losses, are pushing back aggressively. The outcome — whether the 2027 benchmark stays at zero, turns negative, or recovers modestly — will determine the trajectory of global smelter margins for the next contract year and, by extension, the availability of refined copper to end-users. (Source: Fastmarkets)