The recent sharp rise in copper prices has been accompanied by several headline trading themes: the widening LME-COMEX spread, record-low copper concentrate TC, the energy crisis in Peru, repeated uncertainty around the restart pace at Grasberg, and the substitution effect between refined copper and copper scrap in China. At a deeper level, however, these events can all be understood through one central theme: the global emphasis on copper resource security is continuing to rise, and the market is repricing the entire copper value chain.
Since 2025, the US has continued to strengthen the strategic importance of copper. In its Section 232 investigation into copper imports, the US explicitly included copper, copper concentrates, refined copper, copper scrap and related derivative products within the scope of national security review, and required an assessment of how US dependence on copper imports may affect national security and industrial resilience. Subsequent policy discussions also proposed that part of the high-quality copper scrap generated in the US should be prioritized for domestic sales.
Against this backdrop, the COMEX premium over LME is no longer merely a simple screen-traded spread. It has become a price signal through which the US market attracts globally deliverable refined copper resources. If the LME-COMEX spread continues to widen and becomes sufficient to cover transportation, financing, warehousing, delivery and policy risks, it may attract some freely tradable material to the US market. Although this round of trading is different from 2025, the market is already pricing in a wider spread. While market rumors continue to circulate, the COMEX premium has already reflected the US market’s ability to attract resources. Whether this will truly translate into changes in physical trade flows still depends on LME inventories in the US, COMEX inventories and the ratio of cancelled warrants. If US LME inventories decline, the cancelled warrant ratio rises, and COMEX inventories increase at the same time, it would suggest that material may be moving from the LME system into the COMEX system. In that case, the decline in deliverable LME resources could create room for the LME nearby backwardation structure to strengthen.
Once LME shifts from contango into backwardation, the impact will further transmit into the LME-SHFE structure. A stronger LME nearby structure would compress China’s import arbitrage ratio and could even reverse the LME-SHFE spread, passively opening China’s export window. On the one hand, a stronger LME structure would raise smelters’ raw material costs and offshore procurement costs. On the other hand, if China’s domestic import ratio remains weak, exports may be forced to recover in order to repair regional price spreads. Under extreme market conditions, it will be necessary to closely monitor LME time spreads, especially the TOM-NEXT spread. If TOM-NEXT strengthens rapidly, it usually indicates that pressure on nearby deliverable resources is rising, and the market may shift from normal spread trading to pricing the risk of a squeeze.
For China, the core logic is to secure raw material supply. Copper concentrate TC has fallen to around -$107 to -$103/mt, indicating that miners still hold strong bargaining power and that smelters’ raw material procurement pressure continues to rise. In the short term, high sulphuric acid prices can still partly offset smelters’ margin losses. However, against the backdrop of China restricting or banning some sulphuric acid exports after May, further upside room for domestic acid prices may be limited. If sulphuric acid prices fall while TC remains deeply negative, smelters’ profit structure will become even more distorted. If this is further combined with a weakening LME-SHFE structure and a deterioration in the import arbitrage ratio, smelters will simultaneously face rising raw material costs, processing fee losses and declining by-product revenue.
Another key domestic signal is copper scrap. At present, although China’s refined copper social inventory continues to decline under the weakening substitution effect between refined copper and scrap, the sharp increase in copper scrap inventories is also a reality. Affected by reverse invoicing and the fair competition review regulations, tax costs for copper scrap processors have increased. Scrap with invoices has become scarce and is flowing more toward smelters, reducing the actual amount of scrap available to processors and thereby supporting refined copper consumption. However, this support is not without limits. If copper prices continue to rise, the refined copper-scrap spread widens again, and scrap inventory pressure continues to build, the incentive for scrap to substitute refined copper will strengthen. At that point, refined copper demand may decline sharply under the combined effect of high copper prices suppressing consumption and the recovery of scrap substitution, while China’s destocking pace may slow or even reverse into inventory accumulation.
The recent market discussions around Peru’s energy crisis and the delayed recovery pace at Grasberg are more emotional triggers under the broader resource security theme, rather than decisive variables that have already changed the current refined copper balance — in other words, they are more of an excuse for the market. The energy issue in Peru has raised market attention to the stability of energy supply for South American mines. As for Grasberg, Freeport Indonesia previously mentioned that full recovery could be delayed until 2028, but Freeport-McMoRan later stated that it still maintained its plan to restore full production by the end of 2027, showing that there is still a gap between market expectations and the actual impact. These events have not caused severe damage to the global physical refined copper balance in the short term. However, against the backdrop of deeply negative TC, China-US resource competition and widening cross-market spreads, any uncertainty at the mine end will be amplified by the market into a supply security premium.
Looking ahead, four groups of indicators deserve close attention. First, the LME-COMEX spread, US LME inventories, COMEX inventories and the cancelled warrant ratio. If the spread widens together with a visible transfer of material from LME to COMEX, there is still upside room for LME nearby backwardation. If US inventories remain high, the spread is more likely to stay at the level of policy and financial pricing. Second, LME time spreads, especially Cash/3M and TOM-NEXT. If TOM-NEXT strengthens abnormally, the market should watch for nearby structure risk. Third, China’s refined copper-scrap spread and copper scrap inventories. If the refined copper-scrap spread widens and scrap flows recover, the support to refined copper consumption will weaken. Fourth, TC, sulphuric acid prices and the LME-SHFE ratio. If TC continues to deteriorate, acid prices fall and the ratio weakens, smelters’ operating pressure will rise significantly.
Overall, amid the repricing of copper under resource security competition, a price transmission relationship has emerged across COMEX, LME and SHFE, which is the direct driver behind the recent copper price rally. Under the influence of these indicators, capital flows and physical trade flows may be reshaped again. In this environment, securing supply chain stability and cost safety remains a long and difficult process.
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