A deadline came and went in Washington last week, and almost nobody outside the metals world noticed. The Commerce Department was supposed to hand President Trump an updated report on the US refined copper market by June 30, the final input he needs before deciding whether to impose a new tariff on refined copper imports starting in 2027. Whether that report has actually produced a public decision is still unclear as of this writing. But here is the thing that matters more than the announcement itself: the copper market has already spent the better part of eighteen months rearranging itself around the mere possibility of that tariff, and a lot of that rearrangement cannot be undone no matter what gets decided next.
That is worth sitting with for a second, because it is not how tariff stories usually work. Normally you wait for the policy, then the market reacts. With copper, the market reacted first, and kept reacting, for so long that the anticipation became its own economic event.
The eighteen-month rehearsal
Start with the inventories, because the numbers are almost comical. Back in February 2025, COMEX copper warehouses in the United States held roughly 80,000 tonnes of metal. By late June 2026, that figure had climbed to a record 652,200 tonnes, according to data reported by TradingKey. That is not organic demand growth. That is traders physically moving copper out of the London Metal Exchange system and into the United States, betting that whatever tariff eventually lands will be worth having metal on the right side of the border for. LME inventories, unsurprisingly, did the opposite. They fell to around 352,100 tonnes in late June, a near three-month low, as the metal that left never really came back.
US imports of unwrought refined copper tell the same story from a different angle. Between January 2025 and May 2026, average monthly imports ran around 140,000 tonnes, nearly double the 2024 monthly average. Companies did not suddenly need twice as much copper. They needed to own copper that was already inside the tariff wall before anyone knew exactly where that wall would be built.
Why does the timeline matter here? Because the original tariff move goes back to August 2025, when the administration placed a 50% Section 232 tariff on semi-finished copper products and copper-intensive derivatives, things like pipes, wire, rod, and cable. Refined copper itself, the raw cathode that feeds wire mills and smelters, was carved out and given a longer runway: a proposed phased tariff of 15% starting January 1, 2027, rising to 30% on January 1, 2028, contingent on the Commerce Department’s June 30 assessment of domestic refining capacity. That two-step structure, tariff now on downstream products, tariff later on the raw input, is exactly what created eighteen months of runway for traders to front-run the second shoe.
Where the metal actually ran out
None of this would matter nearly as much if global copper supply were comfortable right now. It is not. Chile, which produces more copper than any other country on earth, saw national output fall 9.04% year over year in March 2026, to 434,314 tonnes, according to Cochilco, the country’s copper commission. The declines were broad. Codelco, the state miner, was down 10%. BHP’s Escondida, the largest copper mine in the world, fell 15.75%. The Glencore-Anglo American joint venture at Collahuasi dropped 10.80%.
Chile is not an isolated case. Freeport-McMoRan’s Grasberg mine in Indonesia, one of the largest copper and gold operations anywhere, pushed back its full production restart from 2027 to 2028 following a mudslide in September 2025, and the company cut its 2026 production guidance by 35%, as CNBC reported in March. In the Democratic Republic of Congo, Ivanhoe Mines’ Kamoa-Kakula project has struggled to recover from 2025 flooding, and now faces a separate bottleneck entirely: a shortage of sulfuric acid, the chemical needed to process oxide copper ore. China halted sulfuric acid exports in May 2026, a move JPMorgan estimates affects roughly 15% of global copper production that depends on acid leaching. Spot sulfuric acid prices in Chile have reportedly climbed above $400 a tonne as a result, according to reporting from Crux Investor, squeezing margins at exactly the projects that were supposed to help fill the gap.
Add it up and you get a market where three of the largest copper-producing regions on the planet are simultaneously underperforming, for three completely unrelated reasons. That kind of coincidence is rare, and it is a big part of why prices have behaved the way they have.
A deficit nobody disputes, even if they argue about the size
COMEX three-month copper hit a record $6.65 a pound on May 13, 2026, equivalent to roughly $13,650 a tonne on the LME, before settling back into a range closer to $13,100 to $13,400 a tonne. As of this week, COMEX copper was trading around $6.24 a pound. Up or down thirty or forty cents in a matter of weeks is now a completely normal week for this metal.
Wall Street’s banks do not agree on how bad the 2026 supply deficit will actually be, but they all agree there is one. Morgan Stanley is the most bearish on supply, projecting a 600,000-tonne shortfall for the year, which would be the largest in more than two decades. JPMorgan is more measured, at 330,000 tonnes. The International Copper Study Group, an industry body that tends toward caution, revised its own 2026 forecast from a projected 209,000-tonne surplus back in October 2025 to a 150,000-tonne deficit by May 2026. When an organization moves from surplus to deficit in seven months, that is not a rounding error. That is a genuine shift in how the physical market is being read.
Goldman Sachs has said that if the refined copper tariff proceeds as proposed, prices could push above $14,000 a tonne in the second half of this year, and the bank has already raised its year-end 2026 LME forecast from $12,465 to $13,735 a tonne. None of that is a promise. It is a forecast, and forecasts on copper have been wrong in both directions plenty of times over the past two years.
What the decision can and cannot change now
Here is the uncomfortable truth for anyone waiting on a headline out of Washington to tell them what to do. Whatever the administration ultimately decides on refined copper, the physical reshaping of the market is already done. You cannot easily un-ship 570,000 tonnes of copper back across the Atlantic. You cannot instantly restore Grasberg, or Kamoa-Kakula, or Escondida to full output. The White House’s own June 1 fact sheet on the tariff program pointed to new investment from Highland Copper, Ivanhoe Electric, Rio Tinto, and Wieland in US mining, smelting, and fabrication capacity, which is precisely the kind of response tariff policy is designed to encourage. But building smelters takes years, not months. If the refined copper tariff is confirmed, US buyers pay more starting in 2027 and the rest of the world, now sitting on thinner LME stockpiles, has to absorb tighter supply outside American borders. If the tariff is scaled back or delayed, COMEX premiums likely deflate somewhat and some of that stockpiled metal eventually finds its way back into global circulation, but the underlying mine disruptions in Chile, Indonesia, and the DRC do not disappear because a proclamation changed.
That is really the story here. Tariff policy has become a headline generator, but the deficit driving copper’s rally this year was never purely a Washington creation. It is geology, weather, and chemistry, three mines in three countries with three different problems, layered underneath eighteen months of speculative positioning that has permanently rewired where the world’s copper physically sits. Investors watching for the next presidential proclamation might be looking at the wrong scoreboard. The market already made its move.
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This article is written for educational and informational purposes only and does not constitute financial or legal advice. The views and analytical frameworks presented draw on publicly available information and reported commentary from industry participants. Readers are encouraged to consult primary sources and form their own informed views on these complex topics.
