Copper Smelters Rely on By-Products as Processing Fees Collapse Despite Record Copper Prices

The global copper market is witnessing a striking contradiction. While copper prices remain close to historic highs, copper smelters are facing mounting financial pressure due to the dramatic collapse in processing fees. Traditionally, smelters generated a significant portion of their earnings by converting copper concentrate into refined metal and charging treatment and refining charges (TC/RCs) for this service. However, an unprecedented decline in these fees has fundamentally altered the economics of copper refining, forcing smelters to depend increasingly on valuable by-products such as gold, silver, and sulfuric acid to sustain profitability.

The sharp deterioration in processing fees is largely the result of China's rapid expansion of copper smelting capacity, which has significantly outpaced the growth in global copper mine production. As the world's largest copper refiner, China has invested heavily in expanding its refining infrastructure over recent years. However, the supply of copper concentrate has not kept pace with this increase in processing capacity, creating intense competition among smelters for limited raw materials. As a consequence, spot treatment charges have remained in negative territory for several months, an extraordinary situation in which smelters effectively pay mining companies for the privilege of processing copper concentrate rather than earning fees from the service.

This shift has substantially reduced the importance of conventional benchmark treatment charges in determining smelter profitability. Instead, the commercial value of precious metals contained within copper concentrates, particularly gold and silver, has become increasingly significant. Rising prices for both metals have helped offset a portion of the financial losses resulting from the collapse in processing charges. Additionally, sulfur recovered during the refining process has emerged as another critical revenue source.

Sulfuric acid production has become particularly lucrative following disruptions to Gulf exports caused by the Iran war and the closure of the Strait of Hormuz. The resulting supply shortages have driven sulfuric acid prices higher, providing copper smelters with an important alternative source of income. In response to these favorable market conditions, some Chinese smelters have reportedly begun processing larger quantities of pyrite, commonly known as "fool's gold," primarily because of its higher sulfur content rather than its copper value. This strategic adjustment highlights the extent to which the industry's revenue model has evolved.

What makes this transformation especially remarkable is the speed at which it has occurred. China's refined copper production increased by approximately 8% year-on-year to reach 14.72 million tonnes in 2025, while global mine production grew by only around 1%, according to the International Copper Study Group. The imbalance between refining capacity and concentrate availability has therefore widened considerably within a relatively short period.

Recognizing the deteriorating market conditions, the China Smelters Purchase Team (CSPT), representing the country's largest copper producers, agreed in November to reduce production by 10% during 2026 in an effort to stabilize processing fees. Despite this commitment, official data from China's National Bureau of Statistics showed that refined copper output continued to increase, rising by 7.4% year-on-year between January and April 2026. The continued growth suggests that announced production cuts have had little practical impact on easing the supply-demand imbalance.

The rapid changes in the copper concentrates market are also prompting industry participants to reconsider the long-standing practice of annual benchmark pricing agreements. Chilean mining company Antofagasta has reportedly proposed replacing annual benchmark negotiations with spot index-based pricing during its mid-year discussions with Chinese smelters. Such a move would better reflect prevailing market conditions, particularly as the gap between benchmark treatment charges and actual spot market pricing continues to widen.

The expanded membership of the CSPT is expected to strengthen its negotiating position with mining companies. Nevertheless, unless substantial reductions in Chinese refining capacity are implemented, the disconnect between benchmark pricing and real market fundamentals is likely to persist. As a result, the copper refining industry appears to be entering a new phase in which operational flexibility, by-product revenues, and market-responsive pricing mechanisms will play a far greater role than traditional processing fees in determining financial sustainability. Media reports indicate that these structural shifts could reshape the economics of the global copper industry for years to come.

Impact of Copper Price Surge & Smelter Crisis on Copper Commodity Prices

Copper prices have surged to record highs in 2026, briefly exceeding $14,500 per tonne, driven by supply disruptions at major mines and US inventory build-up due to tariff uncertainty. For copper as a tracked commodity, this has direct downstream consequences:

Smelter treatment and refining charges (TC/RCs) have settled at $0 per tonne for 2026 — the lowest ever — as Chinese smelter overcapacity outpaced concentrate supply, intensifying competition. Spot TC/RCs turned deeply negative, reaching as low as –$90/t in March 2026, signaling extreme concentrate tightness.

If Chinese smelters maintain 20%+ production cuts through Q4 2026, the refined copper deficit could exceed 350,000 tonnes, potentially pushing prices back toward $13,000/t. BloombergNEF warns copper demand for the energy transition could triple by 2045, with structural deficits possible as early as 2026.

In short, copper prices tracked by ChemAnalyst are expected to remain elevated and volatile through 2026, driven by smelter bottlenecks, mine disruptions, and inelastic demand from electrification and AI infrastructure.