Copper Prices Hit All-Time Highs, Tariff Uncertainty Drains Global Supply
TREE NEWS reports: Copper prices have surged to unprecedented levels, with LME copper breaking above $14,700 per ton this week. However, this rally is not driven by demand boom but by a severe regional imbalance in global copper inventories. With the US tariff review on refined copper unresolved, a profitable arbitrage window has opened between New York and London, funneling over 1 million tons of copper into the US while tightening supplies elsewhere.
What Happened: Tariff ‘Vacuum’ and Copper Squeeze
The US Commerce Department earlier proposed a 15% tariff on refined copper starting in 2027, rising to 30% by 2028. However, the Trump administration exempted refined copper last year, applying a 50% tariff only on semi-fabricated products like copper tubes and wires, and ordered a review by the end of June. That deadline passed with no announcement from the White House, so traders continue to rush copper into the US.
This ‘suction’ effect is evident in LME inventories, which plunged 32% in a month to just 205,000 tons. Meanwhile, Comex inventories have surged eightfold since early last year to over 750,000 short tons (about 680,000 metric tons), and including off-exchange stocks, the US is estimated to be stockpiling more than 1 million tons—equivalent to the annual output of Escondida, the world’s largest copper mine.
Market Impact: Structural Repricing Amid Inventory Imbalance
The copper rally is now a story of policy uncertainty and inventory hoarding rather than macroeconomic demand. The arbitrage premium between New York and London is large enough to incentivize traders like Mercuria and Trafigura to keep shipping copper to the US. Even if tariffs are ultimately not imposed, analysts expect a significant portion of the metal to remain locked in US warehouses for an extended period. If tariffs are imposed, a final rush of shipments could occur; if abandoned, traders may unwind positions built over the past 18 months, reversing trade flows.
Adding to the squeeze, the US government’s ‘Project Vault’—a $12 billion public-private initiative to build strategic reserves of critical minerals—includes copper as one of the 60 designated critical minerals. This policy support reinforces expectations that copper arriving in the US will not easily return to the global market.
Demand and Supply: Chinese Imports and Mine Constraints
On the demand side, China, the world’s largest copper consumer, has increased direct imports of refined copper this year as smelters face shortages of concentrate and scrap. As manufacturing enters its traditional peak season, Chinese demand is expected to rise further.
Supply constraints are more rigid: with mine disruptions from Chile to Indonesia, if production does not recover in the second half, global mine output could see an annual decline for the first time since 2017. Declining ore grades make mining more expensive and difficult, and environmental reviews increase costs for new projects. According to S&P Global data, mines take an average of over 15 years from discovery to production.
Key Points for Investors
- The copper rally is now structurally driven not only by global growth expectations but also by regional inventory imbalances and policy uncertainty.
- The unresolved US tariff review keeps the arbitrage window open, sustaining copper outflows to the US.
- LME inventories are extremely low, with the spot-3 month spread at its highest since the 2021 squeeze, indicating short-term supply tightness.
- Long-term fundamentals (energy transition and AI data centers) remain favorable, but any resolution to the tariff review could trigger a sharp reversal in trade flows and prices.
Investors should closely watch for US policy announcements. Either decision could dramatically alter copper’s trajectory. For now, the structural bullish thesis holds, but the market is vulnerable to policy-driven volatility.
