Copper Hits Record Highs Amid Trump Tariff Threat

Copper prices have climbed to all-time records as the mere prospect of US tariffs on refined copper pulls the metal toward American warehouses and drains supplies from the rest of the world. The London Metal Exchange (LME) benchmark touched a record $14,875 per tonne in the week of 10 September 2026 before retreating more than 3% in a single session, according to RTBF, the Belgian public broadcaster. By 17 September, three-month LME copper had rebounded to about $14,285 per tonne.

The episode has exposed a market increasingly driven as much by political decisions in Washington as by the fundamentals of supply and demand — a dynamic with consequences for manufacturers, energy infrastructure and consumers worldwide.

A Market Powered by Anticipation

The mechanics are deceptively simple. Copper does not vanish during a price spike; it relocates. For months, traders and industrial buyers have raced to move metal into the United States ahead of a possible import duty on refined copper. The result, as RTBF described it, is that “copper concentrates in the United States, while available stocks elsewhere, notably in London, become scarcer. It is this relative scarcity that drives prices up.”

In July alone, more than 220,000 tonnes of copper flowed into the US — a monthly record. By early September, inventories on the Comex, the main American exchange for copper contracts, reached roughly 680,000 tonnes, about eight times the level at the start of 2025. Meanwhile, LME stocks stood at roughly 242,900 tonnes.

Financial markets do not wait for decisions to react — they anticipate them. Traders had already priced in the expected tariff, creating what analysts call a “tariff premium.” When Reuters reported on 10 September that the White House had not yet decided, part of that premium evaporated — wiping more than 3% off copper in one session.

Washington’s Unresolved Decision

The tariff at the center of the storm has not been imposed. President Donald Trump tasked Commerce Secretary Howard Lutnick with reviewing the copper market and recommending by 30 June 2026 whether to impose a 15% tariff on refined copper starting 1 January 2027, rising to 30% in 2028. That deadline has passed without a public decision.

“The administration continues to evaluate all options to reshore copper and other critical manufacturing back to the United States,” a White House official told Reuters. It was not immediately clear what Lutnick recommended.

The hesitation is rooted in politics as much as economics. Officials are weighing concerns that higher copper prices could raise manufacturing costs against the potential benefit of encouraging more domestic mining — all as the administration focuses on affordability ahead of November’s midterm elections. Tariffs could boost domestic producers but risk feeding inflation, a politically fraught trade-off.

A similar dynamic played out in 2025, when the market expected a blanket tariff on all copper-containing products. Trump stopped short in July 2025, instead imposing levies only on pipes, wiring and other semi-finished products — frustrating mining companies that had sought a sweeping duty.

A Structural Bind Beneath the Headlines

Beyond the political wrangling lies a more stubborn problem: the world cannot quickly produce more copper. Global mine production fell 1% in the first half of 2026 even as demand continued to rise. Opening a new mine takes years — from discovery and permits to infrastructure construction.

The United States is acutely exposed. It imports roughly half its copper needs and operates only two copper smelters, owned by Freeport-McMoRan and Rio Tinto, according to Reuters. US refined copper imports have jumped 16-fold since 2015 while domestic production slipped 20%, according to US Geological Survey data cited by TechTimes. New mines take an average of 16 to 17 years from discovery to production, meaning no tariff imposed today yields additional domestic refined copper before the 2040s.

The demand outlook sharpens the stakes. S&P Global expects growth in artificial intelligence and defense to lift global copper demand 50% by 2040, from roughly 28 million tonnes to 42 million tonnes.

Goldman Sachs Research argues the current prices have overshot underlying fundamentals. Its analysts estimate copper’s “fair price” at around $11,500 per tonne and expect a 15% tariff to be announced in mid-2026 — while warning that any delay could dramatically reshape prices. “We feel that the price has overshot its fair fundamental level,” analyst Eoin Dinsmore wrote, calling a clear tariff decision a potential “catalyst for a correction.”

Winners, Losers and Spillover Effects

The redistribution of stocks creates clear winners and losers. Copper producers and holders of US inventories benefit from elevated prices, while manufacturers that rely on the metal — in electrical equipment, automobiles, construction and electronics — face higher input costs.

“As long as policy remains unresolved, that possibility reduces the incentive to return metal to international markets,” Jacob White, a minerals analyst at Sprott Asset Management, told Reuters — a self-reinforcing loop in which uncertainty keeps global supply tight and prices high.

The consequences reach beyond balance sheets. Record prices have fueled a rise in copper cable thefts across many European countries, including railway cables and EV charging station wiring, RTBF noted. The affordability of the energy transition itself is also in question, since grid expansion, electric vehicles and renewable infrastructure are all copper-intensive.

What to Watch

The immediate question is whether Washington imposes refined copper tariffs — and when. A decision would signal the end of US stockpiling and allow attention to return to the market’s underlying surplus. Goldman Sachs noted the global copper market recorded a 600-kilotonne surplus in 2025, its largest since 2009, and forecasts a further 300-kilotonne surplus in 2026.

For now, copper’s price rests on a delicate balance between long-term supply constraints and short-term political signals. China’s return to buying has lent support, but the market remains hostage to a single unresolved decision in Washington — a reminder that in an electrified world, a humble metal has become a barometer of global trade policy.