NextFin News - Copper is headed for a weekly loss after the White House signaled it has not decided whether to impose tariffs on refined copper, puncturing a policy premium that had lifted the metal to record highs and left traders racing to unwind the most crowded trade in the commodity complex. The hesitation is a reminder that copper's 2026 rally was never just about supply and demand — it was, in material part, a bet on Washington.
COMEX copper futures fell about 4.4% to $6.59 a pound on Thursday, after reaching a record $6.89 a pound a day earlier, while mining shares sold off in sympathy. Freeport-McMoRan, the largest U.S. copper producer, dropped 7.2% to $70.78; Hudbay Minerals fell 7.7% to $26.60; Teck Resources slid 6.8% to $65.54; Rio Tinto gave up 4.2% to $99.33; and Antofagasta lost 6.1% to £37.52. The London Metal Exchange three-month contract traded above $14,100 a tonne, down from an all-time peak above $14,500 set in January, leaving the metal on track for a weekly decline after weeks of grinding higher.
The trigger was a report that the White House is still weighing whether to extend duties to refined copper, even though the Commerce Department delivered its recommendation to President Donald Trump by the June 30 deadline. A White House official said the administration "continues to evaluate all options to reshore copper and other critical manufacturing back to the United States." For a market that had been pricing a 15% tariff from January 1, 2027, rising to 30% in 2028, ambiguity is not neutrality — it is a repricing event.
The Trade That Priced a Tariff That Hasn't Happened
The copper market spent 2026 building a tariff into the price before a single new duty was levied. Traders and industrial buyers rushed to build inventories in the United States ahead of any new duties, creating one of the world's largest stockpiles of the metal. U.S. refined copper imports have jumped 16-fold since 2015, even as domestic production slipped 20%, according to U.S. Geological Survey data. The U.S. imported more than 200,000 metric tons in July alone, the highest level in 12 years.
The mechanism is visible in the spread between COMEX and the London Metal Exchange. Societe Generale analysts modelled the cost of moving LME-grade copper from European warehouses to the U.S. East Coast and compared that all-in delivered price with COMEX futures. Their conclusion: the current COMEX premium over fully delivered LME metal implies a 14.6% likelihood of the Commerce Secretary's recommended phased universal tariff of 15% by January 2027, rising to a 37% probability of a 30% duty by January 2028. ING's Ewa Manthey put it plainly:
"The COMEX-LME spread has increasingly become a gauge of U.S. tariff expectations, with a wider premium signaling greater perceived tariff risk and continuing to pull metal into the U.S."
That gauge is what just got reset. The spread had widened to around $400 a tonne, and every tonne that flowed into the United States was a vote for tariffs. Thursday's selloff was the market withdrawing some of those votes. The arbitrage has already reshaped inventories on both sides of the Atlantic: COMEX-registered stocks have climbed for 46 straight days to a record 675,185 metric tons, a build that came directly at the expense of LME and Shanghai stocks, which declined sharply over the same period. The tariff threat did the tariff's work without the tariff ever being imposed.
Why Uncertainty Itself Is the Catalyst
The paradox of the copper tariff is that the threat has already done much of the work the policy was designed to do. By pulling metal into the United States, the tariff expectation tightened supply outside the U.S. and widened the arbitrage that rewards further inflows. The policy did not need to be implemented to distort global trade flows — the expectation was sufficient.
"As long as (tariff) policy remains unresolved, that possibility reduces the incentive to return metal to international markets,"said Jacob White, a minerals analyst at Sprott Asset Management, which invests in copper producers. That is the trap the market is now in: unresolved policy keeps metal locked in U.S. warehouses, which props up the COMEX premium, which in turn keeps the tariff expectation alive. A decision either way breaks the loop.
Natalie Scott-Gray, senior metals demand strategist at StoneX, called the overdue U.S. Section 232 decision on refined copper the
"single biggest catalyst"facing the copper market. In her reading, comprehensive tariffs would squeeze supply outside the U.S., while no tariffs would unwind the COMEX-LME arbitrage. There is no middle outcome that leaves the spread untouched.
The political economy explains the hesitation. The administration is increasingly focused on affordability ahead of November's midterm elections, with pressure to demonstrate that economic policies are lowering rather than raising costs. Tariffs would improve the economics of U.S. mines, smelters, and refineries, but they would also raise input costs for electrical equipment, vehicles, construction, and other industries at precisely the wrong political moment. Copper is used in construction, transportation, and electronics — a tariff is a tax on the cost-of-living message.
There is also a precedent for exactly this kind of last-minute ambiguity. In July 2025, President Trump imposed a 50% levy on semi-finished copper products such as pipes and wiring but carved refined copper out of the order. The exemption initially sent prices plummeting. The proclamation, however, left open a staged tariff of 15% on refined copper from January 1, 2027, rising to 30% in 2028 — the very decision now stalled in the White House. History is not repeating, but it is rhyming, and the market remembers what happened the last time Washington blinked.
Cyclical Premium, Structural Deficit: Two Markets in One Metal
This is where the analysis has to separate two things the market has been treating as one. The tariff premium is cyclical: it is a policy-driven distortion that will mean-revert if the policy does not materialize. The underlying supply-demand balance is structural: it will not self-correct on its own.
On the cyclical side, the evidence is straightforward. The COMEX premium is a function of expected policy, not of physical scarcity in the U.S. — indeed, U.S. warehouses are overflowing precisely because metal has been pulled in speculatively. If the White House exempts refined copper, as it did in July 2025, the arbitrage unwinds and metal returns to the global deliverable pool. That is a mean-reverting move, and Thursday's 4.4% drop is the first leg. Three historical markers support the call: the July 2025 carve-out, which sent prices down; the collapse of the cash-to-three-month premium from $434 a tonne in mid-August back toward normal levels once short-covering around contract expiry eased; and the fact that COMEX inventories have climbed for dozens of consecutive sessions, a pattern that only makes sense as stockpiling rather than genuine consumption.
On the structural side, the floor is real and it is rising. World copper mine production fell 1.1% in the first half of 2026, according to International Copper Study Group data, as a 2.6% decline in concentrate output outweighed a 4.3% increase in solvent extraction-electrowinning production. Morgan Stanley, which entered the year expecting mine production to rise, now forecasts output will be flat to slightly lower in 2026 — the first annual contraction in global copper mine supply since 2017. ING forecasts the global market will move into a deficit of around 35,000 tonnes in 2026, reflecting mine supply losses across Indonesia, Chile, the Democratic Republic of Congo, and Zambia.
Demand is not doing the cyclical side any favors either. China, the world's largest copper consumer, imported 382,000 tonnes of unwrought copper and copper products in August, the weakest August in six years. Imports during January through August totalled 3.3 million tonnes, down 6.7% from a year earlier. Yet S&P Global expects growth in the AI and defense sectors to boost global copper demand 50% by 2040. The tension between a softening China and an electrifying West is the structural story underneath the tariff noise.
The verdict: the near-term move is cyclical — a policy premium being written down — but the medium- and long-term floor is structural. Investors who treat Thursday's selloff as the end of the copper bull market are confusing the premium with the price. Investors who treat it as a buying opportunity without distinguishing the two benchmarks are making the opposite error.
The Second-Order Question the Market Isn't Asking
The first-order read of Thursday's selloff is obvious: tariff doubts, lower copper price. The second-order question is what happens to the trade map if the premium unwinds without the policy ever landing.
If the White House ultimately exempts refined copper, the metal stockpiled in the United States does not instantly flood back onto the LME. Much of it is committed, financed, or positionally locked; Sprott's White noted that unresolved policy reduces the incentive to move it. So a "no tariff" outcome likely leaves the COMEX-LME spread settling at a structurally wider level than pre-2025 norms rather than collapsing to parity, as ING has argued. The tariff threat permanently altered the flow of copper even if the tariff never happens. That is the second-order effect: policy uncertainty, not policy, reshaped the market.
The third-order implication cuts the other way. If the market has priced only a 14.6% chance of a 15% tariff, and the White House then confirms one, the repricing runs in the opposite direction — and it runs through a market with thinner ex-U.S. supply than existed before the stockpiling began. The same mechanism that capped Thursday's downside would amplify the upside. The asymmetry is not symmetric.
There is also a macro overlay that copper traders cannot ignore this week. The Federal Reserve meets on September 16-17, and about 70% of economists in a recent poll — 65 of 93 — expect the federal funds rate to remain in the 3.50%-3.75% range. Consumer prices are expected to have risen 0.4% month-on-month in August. A hawkish surprise, whether a hike or language that prices one in, would strengthen the dollar and pressure all dollar-denominated commodities, copper included. The tariff premium is being written down at the same moment the macro discount rate is under scrutiny. Two headwinds, one metal.
The Counter-Thesis: The Deficit Doesn't Care About Washington
The strongest argument against the cyclical read is the simplest: the supply deficit is real, and it is getting worse. Mine production is contracting for the first time in nearly a decade. The U.S. imports roughly half the copper it consumes and operates only two smelters, owned by Freeport-McMoRan and Rio Tinto. The country has nearly 30 years' worth of supply within its borders, but bringing it online takes years, not election cycles. S&P Global sees demand rising 50% by 2040 on AI and defense. From that vantage point, Thursday's 4.4% drop is noise on a chart that points to $15,000 a tonne and beyond.
There is force in that argument — for the global benchmark. It does not hold for the U.S. premium. The COMEX price and the LME price have become, in effect, two different markets separated by a policy border. The deficit supports the LME three-month contract; the tariff expectation supports the COMEX premium. When the market sold off on Thursday, it was the premium that was repriced, not the deficit. Confusing the two is how investors end up long the right metal in the wrong market.
The signal that would prove the cyclical call wrong is specific and observable: if the COMEX-LME spread re-widens beyond $600 a tonne while COMEX-registered inventories continue to build, the market is pricing tariffs back in and the "policy premium unwind" thesis fails. The spread is the gauge; the inventory data is the confirmation. Watch both.
What to Watch Next
Short term, the path is set by two events. First, any White House statement on the refined copper decision — a confirmation, an exemption, or further delay each moves the spread in a different direction. Second, the FOMC meeting on September 16-17 and the August CPI print; a hawkish Fed adds a macro headwind to the policy one.
Medium term, the deficit has to show up in the data. ING's forecast of a 35,000-tonne shortfall in 2026 is the base case; if LME stocks keep falling while mine output stays flat, the structural floor holds regardless of U.S. policy. If China's imports recover from their six-year August low, that floor rises further. Three scenarios frame the range: a base case where the decision is delayed and the spread compresses modestly toward $200-$300 a tonne; an upside case where a confirmed tariff re-widens the arb and pushes COMEX back toward its $6.89 record; and a downside case where an outright exemption unwinds the stockpiling trade and drags both benchmarks lower.
Long term, the structural bull case rests on electrification, grid build-out, and AI data centers — demand drivers that do not reverse with an election. The tariff is a detour, not a destination. But detours can be expensive, and this one has already moved hundreds of thousands of tonnes of metal.
The Bottom Line
Copper's selloff is a policy repricing, not a demand collapse. The metal's structural deficit remains intact, but the premium the market built on a tariff that may never arrive has started to unwind — and until Washington decides, uncertainty itself will keep copper volatile and keep metal locked in U.S. warehouses. The tariff threat did the tariff's work without the tariff. That is the paradox Thursday's selloff exposed: in copper, the expectation is the event.
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