China's 60% Grip on Copper Smelting Leaves Western Supply Chains Exposed

China's control of copper smelting has become one of the most concentrated chokepoints in the global metals supply chain, and closing the gap could take Western economies decades and billions of dollars. That warning came from Phillip Mackey, a metallurgist with more than five decades in copper processing and a past president of the Metallurgy and Materials Society of the Canadian Institute of Mining, in remarks published in early August 2026.

Mackey estimates that China now smelts close to 60 percent of the world's copper and refines a similar share. The country turns out roughly 12 million to 13 million tonnes of refined copper a year out of about 26 million tonnes produced globally, drawing on around 45 smelters. Several of those plants rank among the largest ever built. The Guixi complex in Jiangxi province, operated by Jiangxi Copper, is the only single site anywhere with capacity above one million tonnes a year and accounts for roughly a tenth of Chinese electrolytic copper output.

The imbalance is starkest on the mining side. China extracts only about 8 percent of the world's copper ore but processes well over half of it, importing concentrate from Chile, Peru and other producers. Western miners therefore ship raw material to the very country their governments are trying to depend on less, then buy back the finished cathode. Mackey called China the Saudi Arabia of copper smelting and said it controls the market.

The position was built steadily from around 2000 using proven smelting technology, state-backed financing and industrial scale rather than any technological breakthrough. Over the same period the United States cut its copper smelting fleet from about a dozen plants to two, as permitting delays, capital costs and decade-long build timelines discouraged investment. Chile, the largest copper mining country in the world, now runs four smelters after closing capacity.

The clearest measure of the imbalance is the collapse in treatment and refining charges, the fees miners pay smelters to turn concentrate into metal. The 2025 annual benchmark was set at 21.25 dollars per tonne. In December 2025, Antofagasta and Chinese smelters settled the 2026 benchmark at zero dollars per tonne and zero cents per pound, the lowest annual level ever recorded, and the Chilean miner later agreed the same terms with all of its Chinese customers. The spot market went further, falling to minus 126.80 dollars per dry metric tonne by the end of June 2026. At that level smelters are effectively paying miners for the right to process their material.

The pressure has already changed behaviour inside China. The China Smelters Purchase Team, a group of 16 leading producers whose guidance normally sets the spot benchmark, has declined to publish quarterly guidance for several consecutive quarters. Its members agreed to cut 2026 output by more than 10 percent, and Beijing has halted roughly 2 million tonnes of planned new smelting capacity and paused approvals for further plants. The International Energy Agency has cautioned that these measures are unlikely to lift processing charges in a meaningful way, which leaves custom smelters outside China the most exposed group in the chain.

Refined metal prices have moved in the opposite direction. Copper on the London Metal Exchange first passed 12,000 dollars per tonne in December 2025 and briefly exceeded 14,500 dollars per tonne intraday in January 2026. After a mid-year pullback the market has tightened again. On 5 August 2026 the September contract on Comex reached 6.7045 dollars per pound, equal to about 14,781 dollars per tonne and a fresh record, while LME three-month copper touched 14,050 dollars per tonne and the market flipped into backwardation with cash metal commanding a premium of more than 100 dollars over three-month material.

A second constraint is now feeding into the same picture. The closure of the Strait of Hormuz removed around half of seaborne sulphur shipments from the Gulf, and China's ban on sulphuric acid exports, which runs through December, has stripped roughly a quarter of global acid supply. Acid is essential to the solvent extraction and electrowinning route that accounts for more than 15 percent of world copper output. The Democratic Republic of Congo produces about 1.5 million tonnes of copper by that method each year and Chile about 1.2 million tonnes, and some operations are reported to be down to between 30 and 60 days of acid inventory. Higher acid prices are a by-product windfall for smelters, which cushions Chinese margins and pushes processing charges even lower.

Western policy has moved, though slowly relative to the scale of the gap. Since 6 April 2026 the United States has charged an import tax of 10 to 50 percent on copper entering the country, covering refined metal, wire, tube and finished goods that contain a large share of copper. The rates were adjusted again in June. A second rule took effect on 30 July 2026 and requires importers of certain copper wire and cable to state where the metal was originally smelted and where it was cast, which for the first time shows in customs data how much of the supply chain runs through China. The tax on refined copper is set to rise toward 30 percent by January 2028.

Tariffs do not create metal. A modern primary copper smelter costs several billion dollars and typically takes close to a decade to permit, build and commission, and Mackey argued that governments have not yet matched their critical minerals rhetoric with the funding and permitting reform required. He compared the situation with rare earths, noting that although copper is abundant and openly traded, the strategic weakness is similar because Western countries keep exporting raw material and importing higher-value refined product.

Recycling is the one area where North America and Europe retain a genuine edge. Scrap can be processed at smaller scale and lower capital cost than a new primary smelter, and several proposed projects in the United States focus on secondary smelting and anode refining rather than greenfield primary capacity. Recycling alone cannot close the processing gap, but it shortens the timeline for adding domestic output.

For buyers, the practical exposure is not a single plant outage but a structural one. Demand from electrification, renewable energy and data centres continues to rise, refined copper is trading at record levels, exchange inventories outside the United States are thin, and more than half of the world's refining capacity sits in one jurisdiction that has already shown it will restrict exports of a related input. Any procurement plan for copper cathode, rod or wire through 2027 should assume that lead times, premiums and origin documentation requirements will continue to tighten.