A refined copper surplus does not settle the concentrate question

Observed facts: the refined balance is a forecast, not a mine count

The International Copper Study Group (ICSG) forecast in April that global refined copper production would rise by about 0.4% in 2026, while apparent refined usage would grow by about 1.6%. Its resulting projected refined surplus was approximately 96,000 tonnes for 2026 and 377,000 tonnes for 2027. Those figures describe refined metal production against apparent use. They do not mean every smelter can secure the concentrate it wants, or that every buyer can obtain a particular form of copper at a particular location and time. [1]

The same ICSG release revised expected 2026 mine-production growth down to 1.6% from 2.3% in its October 2025 forecast. It cited weaker growth expectations in the Democratic Republic of the Congo, Chile and Indonesia, as well as continuing constraints at Grasberg and Kamoa following incidents in 2025. The Group said constrained concentrate availability would limit primary electrolytic refined output growth in 2026, with secondary production from scrap partly offsetting that limit. This is why the refined balance and the mine-to-smelter feedstock balance should be read as separate series. [1]

Observed facts: price strength and smelter pressure can coincide

Australia’s Office of the Chief Economist reported that London Metal Exchange copper prices exceeded US$14,700 a tonne in early September 2026. It linked the rise partly to strong US imports on tariff expectations and a tight concentrate market associated with mine disruptions and the DRC concentrate export ban. Its September Resources and energy quarterly projects Australian copper export earnings rising from A$14 billion in 2025–26 to A$19 billion in 2030–31 in real terms. These are reported market observations and an official forecast, rather than a current transaction price or a guaranteed outcome. [2]

The International Energy Agency (IEA) describes a different pressure point. Its 2026 critical minerals outlook says benchmark copper smelter treatment fees were settled at US$0 per tonne for 2026, while spot charges had remained negative since 2024. It links the strain to tight concentrate supplies and rapid smelter-capacity expansion, particularly in China. A high refined-copper price can therefore appear alongside weak fee income for custom smelters. The price of finished metal alone is an incomplete measure of conditions for the plants that convert mine output into refined copper. [3]

Observed facts: near-term surplus and longer-term gaps use different horizons

The IEA projects that, under its stated policy scenario and based on announced projects in its base case, expected copper mine supply in 2035 could be about 25% below primary supply requirements. It says the gap has narrowed from about 30% in its previous outlook as more projects advanced. This is a scenario-based comparison of future mine output and requirements after allowing for secondary supply and refining losses. It is not a prediction of a 25% refined-metal deficit in 2026, and it should not be placed beside the ICSG annual balance as though the two figures measured the same thing. [3]

ICSG itself cautions that its projected market balances can differ from subsequent outcomes. Its calculation of Chinese apparent demand uses reported production, trade and exchange stock changes, but excludes changes in several unreported or bonded stock categories. It also flags uncertainty from Middle East disruption. The forecast 2026 surplus is consequently a dated estimate with an explicit inventory limitation. A later change in demand, scrap flows, mine output or stocks could alter the measured balance without invalidating the distinction between mine, concentrate and refined markets. [1]

Oakhampton inference: track the chain, not a single copper headline

For a commodity assessment, Oakhampton would keep four questions apart: how much mine output is expected; how much concentrate is available to particular smelters; how much refined metal is produced and consumed; and where reported or unreported inventories sit. This is an analytical method inferred from the sources, not a claim that any named buyer or seller currently faces a shortage. It helps explain why an annual refined surplus need not translate into relaxed processing terms or easy physical delivery for every specification. The relevant evidence will vary with product form, delivery point, timing and counterparty. [1][3]

The Australian outlook also shows why a price narrative needs a date and unit. Its observed early-September peak is in US dollars per tonne, while its export-earnings projection is an Australian-dollar annual value extending to 2030–31. Neither can be substituted directly for an individual cargo price, smelter margin or realised export receipt. For a transaction, the practical research sequence is to identify the product and quality specification, then compare current independent price, treatment-charge, stock and logistics evidence for the relevant delivery window. That sequence is Oakhampton’s inference from the published data, not personalised trading advice. [2][3]

Remaining uncertainty

The September Australian forecast is newer than the April ICSG balance, but it does not publish a directly comparable revised ICSG refined-surplus figure on its copper summary page. The IEA’s 2035 mine-supply scenario has a different horizon and method again. None of these sources establishes the copper market’s realised balance for all of 2026 as of 2 October. Further mine disruptions, scrap availability, inventory movements, trade policy and economic demand could change the near-term picture. The next useful comparison is an updated official refined-balance release alongside mine output, concentrate terms and reported exchange stocks, with each observation labelled by date. [1][2][3]