Antofagasta Proposes Index-Based Pricing for Copper Concentrate Contracts

Published: Jun 18, 2026 09:41

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According to market sources, Chilean miner Antofagasta has recently proposed to several major Chinese copper smelters that mid-year copper concentrate contracts be priced using spot-market TC/RC indexes rather than the traditional fixed benchmark TC/RC structure. Since the 1980s, annual benchmark treatment and refining charges (TC/RCs) have been established through negotiations between leading miners and smelters, serving as a reference point for copper concentrate contracts worldwide. However, the benchmark system is facing growing pressure as global copper concentrate supply tightens, smelting capacity continues to expand, and spot TC/RCs fall to unprecedented lows. As of June 12, 2026, the SMM Imported Copper Concentrate Index had declined to a record low of -US$119.84/mt. If more miners move toward index-linked pricing mechanisms, the long-standing benchmark TC/RC pricing system could face a fundamental shift.

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