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Why a surplus can coexist with a supply crunch
Copper markets have two different clocks. Mines, smelters and major projects take years to develop, so a pipeline can be inadequate for 2035 while existing operations still produce enough refined metal in the next two years. Demand forecasts, mine disruptions, recycling, inventories and Chinese stock data can also change the annual balance.
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For that reason, investors should not treat one deficit estimate, one stock draw or one price move as proof of a permanent shortage. Read the four charts together, keeping each chart’s supply definition, time horizon and scenario visible.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchChart 1: Mined supply versus demand, 2026–2035
What the chart measures
The International Energy Agency’s 2026 chart places expected mined copper supply beside demand through 2035 under its stated scenario. It is the clearest structural view because both lines share a time axis and the supply line reflects the output path of mines rather than refined-metal availability.
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How to interpret it
Use the chart as a scenario outlook, not as a guaranteed price forecast. In the IEA’s 2025 base case, mined supply peaks at a little over 24 million tonnes in the late 2020s and falls below 19 million tonnes by 2035 as ore grades decline, assets retire and reserves are depleted. The important signal is the direction after the peak: demand can continue rising while the existing production base loses capacity.
A falling mined-supply line does not mean the world has exhausted all copper in the ground. It indicates that currently operating assets and the projects represented in the scenario may not deliver enough output without additional investment, substitutions, efficiency gains or more recycling.
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Chart 2: Existing and announced projects versus 2035 primary requirements
Why the supply definition matters
The IEA’s project-pipeline chart compares expected output from existing and announced mines with primary supply requirements. The IEA defines primary requirements as total demand net of secondary supply, while also accounting for refining losses. That makes the comparison more meaningful than placing mine output directly against total refined demand.
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The pipeline case
In a 2025 news release, the IEA stated that “the current copper mine project pipeline points to a 30% supply deficit by 2035.” This is a pipeline assessment under the stated scenario and assumptions, not a certainty that a 30% physical shortage will occur. New projects, expansions, higher recovery rates, demand changes and additional secondary supply could alter the result.
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When reproducing this chart, label the scenario and assumptions on the graphic. A reader should be able to tell whether a bar represents mined production, primary requirements net of recycling or another measure. Mixing those definitions can make a manageable gap look catastrophic—or hide a real one.
Chart 3: Near-term mine growth and the refined balance
The 2026–2027 counterweight
The International Copper Study Group’s April 2026 forecast supplies the short-term context missing from a 2035 pipeline chart:
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| Year | Forecast world mine-production growth | Forecast refined-copper balance |
|---|---|---|
| 2026 | 1.6% | Surplus of about 96,000 tonnes |
| 2027 | 2.3% | Surplus of about 377,000 tonnes |
These are annual forecasts, not guarantees. A refined surplus can occur while the long-term project pipeline remains insufficient because existing mines, smelters, inventories and secondary material determine the near-term balance. Conversely, a disruption at a large mine, a demand revision or a change in recycling can erase a projected surplus.
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Read the caveats with the numbers
The ICSG notes that actual balances can diverge because of unforeseen developments. Its treatment of China’s apparent demand does not include several categories of unreported stocks, so the published balance should not be read as a complete inventory of every tonne held in the country. Keep that limitation in the chart caption or accompanying note.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Chart 4: Stocks and prices as a market-tightness check
Build a dated time series
Use the ICSG’s selected copper statistics to plot reported stocks and prices over time, then annotate major production or demand events. ICSG’s recurring statistics cover production, usage, stocks, prices and trade. For every series, identify the exchange or warehouse, unit, currency, contract and observation date. “Stocks” is not a single universal pool: exchange-reported inventories and broader estimated inventories can move differently.
What the signals can—and cannot—say
A sustained stock draw alongside firm prices can indicate tighter prompt availability, while rising stocks and weaker prices can indicate easier nearby supply. Neither pattern proves a structural mine deficit. Reported stocks also move because of international trade, commercial stocking and destocking, financing decisions and shifts between warehouses. Treat the series as a market check on the supply-and-demand charts, not as a standalone verdict.
How to compare copper outlooks without mixing unlike numbers
Before comparing two charts, check these axes:
- Time horizon: near-term forecasts for 2026–2027 answer a different question from a 2035 structural outlook.
- Supply definition: mined supply, refined supply and primary requirements net of secondary supply are not interchangeable.
- Scenario: identify whether the chart uses an IEA case such as STEPS or another stated set of assumptions.
- Geography: confirm whether the series is global, regional or limited to reporting countries.
- Recycling treatment: check whether secondary supply is included, excluded or netted from demand.
- Inventory scope: distinguish exchange-reported stocks from broader estimated holdings.
Keeping those labels visible prevents a common error: using a short-term refined surplus to dismiss a long-term mine-development problem, or using a long-term pipeline gap to claim that a shortage must appear in the next quarter.
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Update the four charts together and watch six indicators:
- Mine production: compare actual output with the growth path in the forecast.
- Refined usage: track demand revisions rather than relying on a single annual estimate.
- Secondary supply: note whether recycling is expanding enough to reduce primary requirements.
- Reported stocks: record the exchange or warehouse and the observation date.
- Prices: document the currency, contract and market used; the available official material does not establish a single authoritative copper price target.
- Project additions: record new mines, expansions, delays and cancellations, because the pipeline is the slowest-moving part of the system.
The central conclusion is a timing distinction: the ICSG’s projected refined surpluses for 2026 and 2027 do not invalidate the IEA’s warning that the current mine-project pipeline could leave a substantial primary-supply gap by 2035. Investors get a more useful signal by tracking both horizons and preserving the definitions behind every line.
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