Copper: a lead-time-governed supply gap

The finding

Electrification demand will outrun what the world's mine pipeline can physically deliver by 2040, because the supply response is governed by a 15-to-17-year lead time that no price signal can compress. The central estimate comes from a 20,000-draw simulation of the announced copper supply pipeline: the world comes up roughly 8.5 million tonnes short of projected 2040 demand, on a 95% confidence interval running from 3.8 to 13.2 million tonnes, with a 93% probability that the shortfall exceeds 5 million tonnes.

The wall is built out of time. S&P Global Market Intelligence's dataset of 127 mines that have come online since 2002 puts the average time from discovery to production at 15.7 years; mines that began operating between 2020 and 2023 averaged 17.9 years; and S&P Global's January 2026 study finds it takes 17 years on average for a new copper mine to go from discovery to production. Run forward, projects reaching a final investment decision from 2026 onward contribute a median of 0.6 million tonnes to 2040 supply, against a demand path implying roughly 1 million tonnes a year of net new supply.

Underneath the pipeline, the ore is getting poorer. BHP reports Escondida's average concentrator grade at 0.90% for the year to June 2026 and expects a feed grade of roughly 0.70% for the year to June 2027. Cochilco puts Chile's weighted-average ore grade at 0.94% in 2006 and 0.62% in 2024. Falling grade raises the energy, water, haulage, and capital required for each tonne of finished metal, which lifts the price a new project needs in order to clear its investment hurdle.

The refining layer sits on top of the mine gap. Refinery-production data in the USGS Mineral Commodity Summaries 2026 puts China at 44.9% of world refined copper output in 2024 and an estimated 48.3% in 2025. Running the announced ex-China smelter and refinery pipeline forward, the probability that China's share falls below 40% by 2035 is 0.2%.

The report is equally direct about what its own evidence refuses to support. Across 967 weeks of London Metal Exchange data from 2008 to 2026, weeks when stocks sat more than one standard deviation below their own trend were followed by a 13-week median copper return of negative 1.4%, against positive 1.9% in all other weeks, a difference of 3.3 percentage points carrying a p-value of 0.000. LME registered stocks stood at 306,500 tonnes on July 10, 2026, 1.61 standard deviations above their five-year trend. Across five Section 232 copper events the world copper price moved less than on random days; what moved was the US-versus-world price spread, which collapsed by 2,679 dollars a tonne in a single session on a change of definition. The report publishes no price target for copper and makes no call on the timing of any repricing.

The numbers that carry it

• 8.5 million tonnesThe median modeled 2040 copper supply gap, on a 95% confidence interval of 3.8 to 13.2 million tonnes and a 93% probability the gap exceeds 5 million tonnes. As of publication, July 2026.
• 15.7 yearsAverage time from discovery to production across 127 mines online since 2002, on S&P Global Market Intelligence data, with mines that began operating 2020 to 2023 averaging 17.9 years. As of publication, July 2026.
• Median 0.6 MtContribution to 2040 supply from copper projects sanctioned 2026 or later, against a demand path implying roughly 1 million tonnes a year of net new supply. As of publication, July 2026.
• 48.3%China's estimated share of world refined copper output for 2025, up from 44.9% in 2024, on USGS Mineral Commodity Summaries 2026 refinery-production data. As of publication, July 2026.
• 306,500 tonnesLME registered copper stocks at the July 10, 2026 close, 1.61 standard deviations above their five-year trend.

What would change our mind

A sustained run of mine approvals above roughly 1 million tonnes a year of new capacity, arriving alongside recycling and substitution scaling fast enough to bend the 2040 demand path down toward the deliverable supply path.

Related research

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• LiveDashboard. The nightly regime read and the underlying series.

Published July 2026. Figures are as of publication and are not updated on this page.