ICSG Copper Forecast: How a 246,000-Tonne Swing Reveals What Market Models Cannot Capture
The International Copper Study Group published a copper market forecast update in April 2026 that should prompt every copper investor to reconsider how much weight they place on any single balance forecast. Six months earlier, at its October 2025 meeting in Lisbon, the ICSG projected a 150,000-tonne deficit for 2026. The April 2026 update revised that to a 96,000-tonne surplus. A 246,000-tonne swing in a single revision, without a single major new mine solving the underlying problem. The ICSG copper forecast swing illustrates precisely where the structural limits of market modelling sit.
The revision was driven by two forces operating simultaneously: softer demand and higher secondary supply. The Middle East conflict and disruption to global trade flows prompted the ICSG to revise refined copper usage growth down from 2.1% to 1.6%. EU demand remains subdued. Japan is flat. At the same time, scrap-based secondary refined production is expected to grow 5.7% in 2027, as new and expanded processing capacity comes online across multiple jurisdictions. Less demand, more scrap: a surplus emerges.
What Actually Changed in the ICSG Copper Forecast Between October and April
Mine production growth was revised down from 2.3% to 1.6% for 2026. Grasberg, the Freeport-McMoRan operation in Indonesia, continues to underperform following the 2025 mud-inflow accident. Kamoa-Kakula in the DRC remains in rehabilitation. Chile and the DRC came in below expectations. The mines that were supposed to close the supply gap have not closed it. The pattern runs through the majors as well: the Codelco Q1 2026 production audit showed record profit sitting alongside falling output at the world’s largest copper producer.
Refined production growth in 2026 was a mere 0.4%, constrained by concentrate availability even as new smelting capacity has come online. The structural tension between mining output and refining capacity, where smelters have been built but cannot be fully fed due to concentrate shortages, is acting as a brake on the system.
The demand revision is equally instructive. The ICSG’s calculation of Chinese copper demand excludes unreported stocks: no State Reserve Bureau movements, no bonded warehouse flows, no producer or trader inventory changes. In a year where Chinese apparent demand is growing 1.9%, the actual physical balance could look materially different depending on what is happening off the books. The surplus figure is a model output, not a physical reality.
Why the 2027 Surplus Projection Deserves Scepticism
The ICSG projects a 377,000-tonne surplus in 2027 as mine supply from new operations in Mongolia, Russia, Uzbekistan, and a string of smaller jurisdictions ramps into the market. That projection is built on an assumption that those operations execute on schedule, at forecast grades, without operational disruption.
The track record on that assumption is poor. Oyu Tolgoi in Mongolia, the Malmyz mine in Russia, and new capacity in Uzbekistan are all real projects. They are also projects in politically complex jurisdictions with infrastructure challenges, permitting dependencies, and operational ramp-up risks that have historically caused production to come in below schedule. The ICSG’s October 2025 forecast already had to revise mine growth down from 2.3% to 1.6% due to unexpected disruptions. There is no obvious reason to assume 2027 execution will be different.
The more useful framing for investors is that the ICSG forecast provides a reasonable central scenario, not a reliable point estimate. The range of plausible outcomes around the central case is wide, particularly for a market where Chinese unreported stocks can shift the apparent balance by hundreds of thousands of tonnes.
This is the kind of analysis we publish daily in The Drill Down.
The China Demand Calculation Problem
The structural weakness in all ICSG balance forecasts is the China demand calculation. The ICSG explicitly acknowledges that its China apparent demand figure excludes unreported inventory movements: State Reserve Bureau acquisitions or releases, bonded warehouse changes, and producer and trader stock adjustments. These flows are not small. In periods of trade policy uncertainty or strategic stockbuilding, they can amount to hundreds of thousands of tonnes.
Chinese apparent demand is growing 1.9% in the ICSG’s 2026 model. If that figure understates actual physical consumption by even 5%, the surplus disappears. If the SRB is running down strategic stocks, the surplus becomes a deficit. The confidence interval on the ICSG’s China demand number is wide enough that the sign of the market balance, surplus or deficit, is genuinely uncertain.
This is not a criticism of the ICSG methodology. It is a recognition that modelling a market where the dominant demand centre does not publish comprehensive inventory data is inherently uncertain. Investors who treat the ICSG balance as a reliable forward indicator are accepting a precision that the underlying data cannot support.
What the Swing Means for Copper Price Discovery
Copper went from a projected structural deficit to a projected surplus without a single major new mine solving the underlying supply problem. What changed was a demand revision and a reclassification of secondary supply growth. For price discovery, the implication is that the macro environment, specifically trade flows, geopolitical disruption, and Chinese industrial activity, is currently more important than mine supply fundamentals.
That is not a permanent state. Grade decline across the major copper mines is structural and ongoing. Replacement rates for depleted reserves remain inadequate. The long-term supply case for copper is not resolved by a 96,000-tonne surplus projection for 2026 or a 377,000-tonne surplus projection for 2027. Both figures are sensitive to Chinese demand and to operational execution at a handful of key projects.
For capital allocators, the more productive question is not whether the ICSG’s 2026 or 2027 number is correct, but what the structural supply position looks like when the macro noise clears. On that question, the answer remains: there are not enough high-quality, construction-ready copper projects to meet long-term demand growth. That is the same constraint that sits underneath the copper investment gap, where the binding shortage is in financeable projects rather than in capital. The ICSG swing does not change that.
Key Takeaways
- The ICSG revised its 2026 copper balance by 246,000 tonnes between October 2025 and April 2026, swinging from a 150,000-tonne deficit to a 96,000-tonne surplus. The revision was driven by softer demand and higher scrap-based supply, not new mine production.
- The ICSG’s China demand calculation excludes unreported inventory movements from the State Reserve Bureau, bonded warehouses, and trader stocks. The margin of error in that exclusion is large enough to change the sign of the market balance.
- Mine supply growth was revised down, not up: Grasberg, Kamoa-Kakula, Chile, and the DRC all underperformed. Long-term supply constraints remain unresolved regardless of near-term balance revisions.
FAQ
What did the ICSG copper forecast revision in April 2026 show?
The ICSG’s April 2026 Copper Market Forecast revised the 2026 copper balance from a 150,000-tonne deficit (forecast at the October 2025 meeting) to a 96,000-tonne surplus, a swing of 246,000 tonnes in a single forecast update. The revision reflected lower-than-expected copper usage growth, revised down from 2.1% to 1.6% due to the Middle East conflict and trade flow disruption, and higher secondary refined production growth from scrap. For 2027, the ICSG projects a larger surplus of 377,000 tonnes.
Why did the ICSG copper balance swing so dramatically between forecasts?
The 246,000-tonne swing between the October 2025 and April 2026 ICSG forecasts reflects the sensitivity of copper balance models to demand assumptions and secondary supply estimates. Refined copper usage growth was revised down from 2.1% to 1.6% due to macro headwinds from the Middle East conflict and trade flow disruption. Secondary refined production from scrap was revised up. Mine production growth was also revised, from 2.3% to 1.6%, with underperformance at Grasberg, Kamoa-Kakula, and operations in Chile and the DRC.
How reliable are ICSG copper market balance forecasts?
ICSG copper balance forecasts provide a useful central scenario but should not be treated as precise point estimates. The ICSG explicitly excludes Chinese unreported inventory movements from State Reserve Bureau operations, bonded warehouses, and trader stocks from its China demand calculation. These flows can be large and can shift the apparent market balance by hundreds of thousands of tonnes. The ICSG itself acknowledges that actual market balance outcomes have historically deviated significantly from forecasts due to unforeseen developments.
Does the 2026 copper surplus forecast change the long-term supply case?
No. The 2026 surplus projection reflects near-term demand softness and higher scrap supply. It does not resolve the structural long-term supply challenge: grade decline at existing copper mines, inadequate replacement rates for depleted reserves, and an insufficient pipeline of construction-ready projects to meet long-term demand growth from energy transition and electrification. Copper went from a projected deficit to a projected surplus without a single major new mine entering production. The underlying supply problem remains unaddressed.
This analysis is from The Drill Down, a daily briefing on critical minerals, junior mining, and capital markets. Join 3,200+ investors and operators who read it before the market opens.
Sources
International Copper Study Group Press Release October 2025; ICSG Copper Market Forecast 2026/2027 and accompanying press release April 23, 2026; Recycling Today April 28, 2026.
Kamoa Capital is not licensed and does not know your circumstances. Nothing here is financial, legal or tax advice – seek professional advice and read any PDS before acting. We aim for accuracy but make no guarantees and accept no liability. Views are opinions only and may include forward-looking statements that may not occur.
