Antofagasta Minerals (AMSA) has reportedly reached provisional settlements with several Chinese smelters in its 2026 mid-year copper concentrate negotiations, indicating a move away from traditional fixed treatment and refining charge (TC/RC) contracts towards copper concentrates index pricing mechanisms.
The latest developments reinforce our view that persistent concentrate market tightness is continuing to reshape copper concentrate index pricing. If ultimately confirmed, they would represent an important milestone in the gradual shift away from fixed benchmark pricing while raising broader questions regarding the structure of future benchmark negotiations and the proportion of contract volumes that will continue under fixed-price mechanisms.
A continuation of an emerging trend
While the details of the provisional settlements between AMSA and Chinese smelters remain confidential, we understand the structures include trader-to-smelter indexes and/or hybrid pricing mechanisms, referencing both miner-to-trader and trader-to-smelter indexes. Negotiations are understood to be continuing in an effort to reach mutually acceptable final terms.
For decades, annual and mid-year copper benchmark contracts have provided important benefits to both miners and smelters by reducing pricing uncertainty and helping planning. Miners have generally accepted TC/RCs above prevailing spot levels in exchange for pricing certainty, while smelters have benefited from greater visibility over concentrate procurement costs and operating margins.
However, this third consecutive year of exceptionally tight concentrate market conditions is placing increasing strain on this framework. The widening divergence between spot TC/RCs and the levels acceptable under fixed copper benchmark contracts has made it more difficult for both sides to reach mutually acceptable settlements. Against this backdrop, some miners have increasingly favoured pricing mechanisms that better reflect prevailing market conditions, while many smelters have continued to favour the certainty provided by fixed copper benchmark contracts. The increased use of index-linked mechanisms reflects miners’ leverage in current market conditions.
Implications for the 2027 annual benchmark
The shift towards copper concentrates index pricing raises important questions regarding the structure of the 2027 annual benchmark. While it remains too early to conclude that the fixed annual benchmark will disappear, the latest developments suggest that future negotiations are likely to focus not only on the level of any benchmark settlement, but increasingly on the pricing mechanisms used and the proportion of volumes priced under each mechanism.
One possible outcome is that a fixed annual benchmark continues to be negotiated but applies to fewer tonnes as a growing proportion of material is priced using index-linked mechanisms. Under this scenario, while the benchmark would remain an important market reference, it would account for a progressively smaller share of the market.
The transition towards index-linked pricing also changes how market fundamentals are transmitted through realised TC/RCs. Under today’s exceptionally tight market conditions, index-linked pricing enables miners to capture prevailing market conditions more effectively than would be possible under a fixed benchmark. However, when concentrate availability ultimately improves and spot terms recover, the same pricing mechanisms will also transmit those changes more rapidly into realised TC/RCs. Compared with a traditional benchmark system, index-linked pricing increases the responsiveness of miner revenues to underlying market fundamentals in both directions.
The transition also has important implications for smelters. During the current period of record-low spot terms, copper benchmark contracts priced well above prevailing spot levels have helped smelters subsidise spot purchases. Should a greater proportion of concentrate migrate towards index-linked pricing, that implicit support would gradually diminish, potentially reducing the willingness or ability of smelters to continue accepting exceptionally low spot treatment charges once sulphuric acid revenues normalise.
Outlook: Market tightness continues to reshape pricing
The provisional AMSA settlements reinforce our view that the copper concentrate market is continuing its gradual shift away from the traditional fixed-price benchmark system towards index-linked and more flexible contractual arrangements. This transition reflects an extended period of exceptionally tight concentrate markets and a growing preference among miners for pricing mechanisms that better capture prevailing market conditions.
CRU has long published robust, transparent and widely adopted copper concentrate TC/RC assessments. Earlier this year, we launched new weekly assessments to compliment our long running monthly TC/RCs.
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