The treatment charge (TC) — the fee smelters earn for converting concentrate into refined copper — has plunged to levels that make no economic sense for Chinese smelters to operate at full capacity. Spot TC/RC benchmarks have fallen to near $0 per tonne in May 2026, with some transactions reportedly dipping into negative territory. For context, the industry's typical breakeven TC is in the range of $50–70 per tonne. Smelters are effectively paying to process concentrate, an unsustainable position that is already triggering voluntary and involuntary production cuts across China's sprawling smelting sector. (FACT: Reuters, Fastmarkets, May 2026)
The root cause is a growing mismatch between mine supply and smelting capacity. Global copper mine output has struggled to keep pace with the rapid expansion of Chinese smelting capacity, which now accounts for over 50% of global refined production. Concentrate supply from major mines — including ongoing disruptions at Codelco's operations, the ramp-up struggles at Quebrada Blanca Phase 2, and the lingering impact of the Cobre Panama closure — has been insufficient to feed the smelters. The result is a bidding war for available concentrate that has pushed TC/RCs to historic lows. (FACT: ICSG, S&P Global, May 2026)
The International Copper Study Group (ICSG), in its April 2026 forecast, acknowledged that global refined production growth is slowing and flagged that a deficit of 200,000–300,000 tonnes is possible in 2026. If Chinese smelters implement sustained production cuts in response to the TC squeeze, that deficit could widen materially. Codelco's production is recovering but remains below historical levels, offering little relief to a concentrate market that has never been tighter. (FACT: ICSG, Reuters, May 2026)
The TC/RC squeeze is not just a smelter problem — it is a leading indicator of refined copper scarcity. When Chinese smelters cut output, the downstream effect is reduced availability of cathode for the physical market, particularly for delivery into Asia. Buyers with long-term contracts linked to LME pricing may face delays and allocation reductions as smelters prioritise margin preservation over volume. We recommend engaging directly with smelter partners to assess their operational status through Q3 2026, and exploring alternative cathode sources — including secondary/ scrap-based supply — to diversify exposure. The TC collapse also argues for rebuilding cathode inventory buffers now, before the production cuts translate into visible LME draws.