Copper and aluminum prices fell on October 13, 2026. The reason had less to do with mines and smelters than with server farms.
Investors are growing nervous about how much money is being poured into AI infrastructure. That nervousness has turned into doubts about how much metal the world will actually need.
What happened to metal prices
Both metals retreated significantly during the session. The selling came as the wider AI and technology trade went through another rough patch.
Part of that turbulence comes from a growing chorus of warnings. The concern is that the rapid expansion of data centers could hit financial obstacles. Building these facilities is expensive, and financing them at the current pace may get harder.
Copper had been riding high before this pullback. Prices had recently hovered near record levels above $14,000 per metric ton. Demand tied to AI and electrification did much of the lifting.
The South Korea connection
The pain was not confined to metals. South Korea’s equity benchmark fell as much as 7% during the same stretch.
The link is not random. Throughout 2026, South Korean stocks have moved in step with copper prices. Both have essentially been tracking the same story: global appetite for AI hardware and the infrastructure behind it.
Not the first warning shot
This is the second time in roughly a month that AI sentiment has weighed on copper. In mid-September 2026, prices came under pressure after technology executives called for AI development to slow down.
Those calls dented expectations for data center investment. If the people building AI are suggesting the industry tap the brakes, investors naturally wonder whether the construction boom will tap the brakes too.
What this means for investors and the metals market
The immediate takeaway is that volatility may stick around. As long as questions about financing AI infrastructure remain unresolved, copper and aluminum could keep swinging with every new headline from the tech sector.
The episode also highlights a concentration risk that built up quietly during the rally. A significant portion of the bullish case for copper this year has rested on AI demand. When one theme carries that much weight, a crack in confidence travels fast.
South Korea’s sharp drop shows how far that risk extends. Investors holding regional equities, mining stocks or commodity funds may all be exposed to the same underlying bet, even if their portfolios look diversified on paper.
The key question for the months ahead is whether the financing worries prove temporary or start showing up in actual construction plans. If data center projects get delayed or cancelled, the demand outlook for copper and aluminum would need a real rethink.
Disclosure: This article was edited by Diego Almada Lopez. For more information on how we create and review content, see our Editorial Policy.