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Andy Home: The US tariff on copper is draining China's warehouses.

China's refined copper exports surged to records levels in the last year, as the world’s top buyer found themselves in unusual competition with the U.S.

CME's U.S. Copper contract continues to command an impressive premium over the London Metal Exchange's (LME) international copper price as the "market prices" in anticipation of possible U.S. Tariffs. The decision was deferred to June of this year.

The ripple effect of U.S. metal delivery premiums is now emptying China’s bonded storage zones.

China's exports jumped from 698,500 tons to 143,000 in November. This is already a record.

The total for November included 57.700 tons of goods headed to the U.S. All were sourced from stocks stored in bonded warehouses located at Chinese ports, such as Shanghai.

The lingering threat of tariffs continues to disrupt global trading patterns.

CHINA'S BONDED STOCK RAIDED AGAIN

Last year, the arbitrage between the CME and LME was so blown out that traders had a unique opportunity to make money by shipping copper to the U.S.

CME copper stocks have exploded to 450,000 tonnes, more than LME and Shanghai Futures Exchange combined.

LME stocks for U.S. delivery of desired brands, notably Chilean metal, are exhausted. Chinese and Russian copper made up?95% or the registered inventory as of the end of November.

Metal that was physically unloaded, but had not been cleared by customs to be delivered to mainland buyers has come back to the forefront of attention.

This is the second raid on this bonded inventory.

China exported or redirected 120,000 tons (or more) of refined copper from February to July last year when tariffs on imports were a certainty.

The tariff trade was stifled by Donald Trump's decision to impose tariffs on copper, but only on refined copper, in July.

Since then, traders have been betting that the tariff threat will only be deferred.

The increase in November shipments of goods from Chinese ports to United States is "a testament to the renewed appeal of U.S. deliveries."

Plugging the Gaps

China's portside copper inventory will also leave to plug any gaps that may have arisen elsewhere. Traders are stripping the supply chain of all brands of metal?that can be delivered in accordance with the CME contract, to ensure an?effortless arbitrage trade.

Outbound flows in November included 16,500 tonnes bound for Italy, as well as smaller tons destined for Germany and Sweden.

The rush to get products to the U.S. has caused availability to fall and physical prices to rise everywhere else.

Aurubis, Europe's largest producer, has increased its premium for sales on term this year from $228 to $315 per ton above the LME base price.

Codelco, a Chilean state-owned producer, is charging its European clients $325 per tonne and its Chinese customers $350 per tonne. This reflects the fierce competition between traders for Codelco's brands.

China is still the largest copper importer in the world, but the increase in outbound shipments has caused its net pull of units from other countries to decrease by 11% during the first eleven months of 2025.

It has also struggled to compete with the U.S. premium brands when it comes CME-deliverable products.

China's imports from Chilean metal dropped by 43% on an annual basis between January and November, while those from Peruvian metal declined by 50%.

Chinese buyers are increasingly dependent on imports from Russia and the Democratic Republic of Congo, which represented 37% and 11% of the total imports during the first 11 months of 2025.

SIGNAL CONFUSION

In recent years, it's difficult to tell how much copper is stored in China's warehouses.

Metals are classified as imports by customs departments, but they only become statistically visible when they're reshipped to another country. In that case, it appears on the export side under a special code.

It's obvious that there are fewer imports now than before Trump proposed tariffs in February.

The stripping of China’s port stocks shows how the threat of U.S. Tariffs has impacted global copper flows.

This is also a problem for assessing the current state of a market where prices are hitting all-time highs.

The global exchange inventory was above 800,000 tonnes for the first since 2013 which could dampen the bullish market exuberance.

The CME is where copper continues to arrive daily, and this has been the main driver for higher visible inventories. The CME, where copper is still arriving daily, has been the driver of higher visible stocks.

The physical supply chain as well as the price signal of inventory are still being distorted by the tectonic movement of copper stocks from Europe to the U.S.

As long as Trump's tariff threat causes a CME premium large enough to cover physical shipment costs, the drain on availability elsewhere, including China’s port stocks, could become more acute.

Andy Home is an author and columnist. The opinions expressed in this column are Andy Home's. Open Interest (ROI), a data-driven, thought-provoking commentary on the markets and finance. Follow ROI on LinkedIn, X and X.

(source: Reuters)