Copper Hits Record $14,533 a Ton as Tariff Fears Drain Stocks

Copper set an all-time high on the London Metal Exchange on September 7, 2026, when the benchmark three-month contract climbed as much as 0.8 percent to touch $14,533 a ton. That move cleared the previous intraday peak of $14,527.50 set on January 29, 2026. The metal held most of the gain into the afternoon and was quoted 0.7 percent higher at $14,513 a ton at 16:15 London time. The record was reached in unusually thin conditions, since United States exchanges were closed for the Labor Day holiday and risk appetite across financial markets was subdued.

Copper has gained roughly 17 percent since the start of 2026 and about 47 percent over the past twelve months. Measured against the low of $8,105 a ton reached on April 7, 2025, during the selloff that followed the first round of sweeping United States tariff announcements, the metal is now worth close to 79 percent more. That is a repricing of a core industrial input inside eighteen months, and it lands on every buyer of wire, cable, tube, transformers, motors and power electronics.

The immediate driver is regulatory rather than economic. Under the Section 232 measures in force since August 1, 2025, the United States applies a 50 percent duty to semi-finished copper products and copper-intensive derivatives, while refined cathode, ore and scrap were left outside the scope. A phased duty on refined copper was flagged at the same time, set at 15 percent from January 2027 and rising to 30 percent in 2028. The Commerce Secretary was required to send the White House an update on the domestic copper market by June 30, 2026, after which the President could decide whether to bring forward or widen those duties. More than two months past that deadline, no public determination has appeared, and the market is still pricing the possibility of an earlier or heavier levy on primary metal.

That uncertainty has kept a very profitable trade running. Futures traded in New York have held a persistent premium over London, opening an arbitrage that traders and producers have worked since copper tariffs were first formally proposed in February 2025. United States importers brought in more than 200,000 tonnes of refined copper in July 2026, the largest monthly volume in at least twelve years. Comex warehouse stocks reached about 688,000 tonnes on August 31 and 695,624 tonnes by September 7, against roughly 80,000 tonnes in February 2025. Counting exchange stocks and private port storage, the United States is now sitting on more than a million tonnes of copper accumulated on the expectation of a tariff.

Everywhere else the metal has drained away. London Metal Exchange stocks fell for 42 consecutive sessions into early August, the longest continuous run of declines since 2014, bottoming near 204,975 tonnes with almost half of the remainder already cancelled for withdrawal. The squeeze that followed pushed the nearby spread to roughly $370 between the August and September contracts, the widest one-month dislocation since the 2021 episode that forced the exchange to intervene. Fresh deliveries have since eased the worst of the strain and stocks recovered to 234,275 tonnes on September 1, but the curve remains in backwardation, with cash metal trading at a premium to three-month futures. That structure signals that immediate physical availability, not future supply, is the binding constraint.

Mine supply has given no relief. Chile, the largest producer in the world, turned out 403,424 tonnes in July 2026, down 9.4 percent year on year and 9.8 percent from June, the weakest July since 2011. The national statistics agency pointed to severe weather in the north of the country and maintenance at major sites. The damage reached the wider economy, with the Imacec activity index down 1.5 percent in July against expectations of modest growth, dragged by a 9.3 percent fall in mining. Storms shut Antofagasta's Los Pelambres and Lundin Mining's Caserones. Antofagasta cut its 2026 guidance on August 13 to a range of 625,000 to 655,000 tonnes from 650,000 to 700,000 tonnes, and Lundin trimmed Caserones on August 19 to 120,000 to 130,000 tonnes from 130,000 to 140,000 tonnes. The Chilean copper commission now projects national output falling 2.6 percent this year to about 5.3 million tonnes.

Whether this record signals a genuinely hot global economy or a tariff and inventory squeeze playing out in real time remains open. Structural demand from data centres, power grids, renewable generation and electric vehicles is real, and aging mines are struggling to keep pace with it. But analysts at the Chilean copper research centre Cesco have argued that the tariff prospect is moving the market more than end demand, and that what is being observed is a localised shortage rather than a global consumption surge. The rally has also continued despite genuine macroeconomic headwinds, including the war in Iran and a rise in United States borrowing costs that weighs on capital-intensive manufacturing.

The near-term triggers to watch are the overdue Commerce update and any presidential decision on refined copper duties, the daily pace of London warrant cancellations, whether Chilean output recovers through the fourth quarter, and how far Chinese buyers retreat at current price levels. A clear tariff decision in either direction would settle the arbitrage that has drained the ex-United States market. Until then, buyers outside the United States should plan for scarce prompt metal and volatile spreads rather than for a return to the price levels of early 2025.