You never see it, yet it is everywhere: in the cables that carry electricity, in the motors of electric cars, in the server halls that run artificial intelligence. Copper is the metal of the transition and of computing. And it is sliding into shortage, a shortage with two faces: a fault line dug by ten years of underinvestment, and a lever China has just learned to pull.
2 A shortage foretold
The looming deficit does not come from a demand spike, but from a supply failure.
A fault line long predicted
Ten to twenty years to open a mine
Between the discovery of a deposit and the first tonne produced, ten to twenty years commonly pass: exploration, permits, financing, construction. A decade of insufficient investment emptied the pipeline of projects ready to produce, while the grades of existing mines decline and Chile and Peru pile up water and political constraints. The shortfall was written in advance: not an accident, but a failure of anticipation.
Expected deficit
≈ 150,000 t
In 2026: the market's first structural deficit since 2009, after the ICSG abandoned its surplus forecast.
Refined output
≈ 0.9%
Expected growth in 2026, too weak to deliver fresh tonnes despite record prices.
The self-inflicted fragility
The striking part is not the deficit, but that it was announced. The market knew for years that it would have to invest; it did not. This vulnerability it inflicted on itself, and it is precisely the one an outside lever can exploit.
3 The chemical chokehold
The weapon is not a rare metal, but a humble chemical.
The invisible link
The acid without which one copper in five never leaves the ground
About 20% of the world's copper is produced not by smelting but by leaching: oxide ores are sprayed with sulphuric acid to extract the metal, the so-called SX-EW process. Yet China accounts for more than 40% of global sulphuric acid output, which it co-produces while refining copper and zinc. On 1 May 2026, it suspended its exports, possibly until the end of the year.
Imported by Chile
> 1 Mt/yr
Of Chinese sulphuric acid, to support around 20% of its national copper output.
Copper exposed
300 to 400 kt
Of supply threatened by the acid shortage, from Chile to the Congo corridor (Goldman Sachs estimates).
The sulphur shortage, acid's raw material, is worsened by the closure of the Strait of Hormuz since the Iranian conflict of late February 2026, which blocks Middle Eastern sulphur. A crucial nuance: China is not acting out of pure calculation; it suffers a sulphur deficit of its own and needs acid for its fertilisers in the middle of the planting season. The lever is born of a real vulnerability, which makes it all the more credible.
4 The refining lock
Real power over copper is not in the mine, it is in the smelter.
Where metal becomes usable
China refines more than half the world's copper
We picture power on the side of those who dig the ore. It actually sits in the next step, refining, which turns concentrate into usable metal. There China reigns: more than 50% of the world's refined copper, and four of the five largest smelters on the planet. Since 2005 it has captured over 90% of capacity growth, lifting its share from about 15% to nearly half.
How the lock holds
①
Imported concentrate. China depends on foreign ore, but controls the step that makes it usable: mined in Chile or in the Congo, the metal often passes through its smelters.
②
An unbeatable cost. Subsidised electricity and preferential financing allow costs near $1,200/t, about a third below the global average.
③
The margin war. In January 2026 the treatment charge, the TC/RC, fell to $0/t, an all-time low: non-Chinese smelters, for their part, cannot work at a loss.
Holding the tap
Owning a mine is worthless if you cannot have your ore refined. By holding refining, China holds the tap through which the world's copper becomes usable. That, more than the subsoil, is where sovereignty is decided.
5 A doctrine, not a one-off
Copper is only one front of a far broader strategy.
The common grammar
Leading refiner of 19 of the 20 strategic minerals
The sulphuric-acid move only truly makes sense placed within a whole. For 19 of the 20 major strategic minerals, China is the leading refiner, with an average share of about 70%. These are not isolated strikes, but a doctrine: turning a quiet industrial dominance into a diplomatic lever.
Rare earths
≈ 90%
Of global refining; controls in April and October 2025 on seven heavy rare earths, magnets and processes.
Titanium · tungsten
68% · 80%
Of the world's titanium sponge, and more than 80% of tungsten: so many fronts of one strategy.
From April 2025 to January 2026, Beijing widened its palette: seven heavy rare earths and their magnets, then a rule inspired by US controls targeting any product containing 0.1% Chinese material, then the addition of samarium, gadolinium, lutetium and silver. Carmakers had to scale back, sometimes halt lines. Through acid, copper joins rare earths, antimony, tungsten and titanium in the same arsenal.
6 The flaw in the weapon
A weapon always cuts both ways: this is the nuance that separates panic from analysis.
The lever has a price
China depends too
The country that holds refining depends on the ore it lacks: it imports most of its copper concentrate. It suffers a sulphur deficit above half its needs, and the acid it withholds is acid it needs for its own fertilisers. Shutting the tap also deprives China of outlets and feeds the very competitors it would like to choke.
Why the lever wears out
①
A time-limited weapon. Chinese restrictions are often temporary: dragging them out would accelerate the very diversification Beijing is trying to avoid, as seen with rare earths.
②
A re-industrialising effect elsewhere. High, lasting prices revive mining projects, recycling and substitution, aluminium for some uses, outside China.
③
A risk of backfire. Keeping acid for its fertilisers protects a harvest, but withholding a global input invites retaliation and a loss of commercial trust.
The right tempo
A weapon effective in the short run and costly in the long run: that is what makes it dangerous now and uncertain later. The immediate risk is real; the lasting power less so. It all comes down to tempo.
7 What it changes
In the end, it all comes down to an asymmetry of time.
The problem is time
You cannot build a mine with a decree
Against levers a state activates with a signature, the West can only answer with projects of ten to twenty years: opening mines, building smelters outside China, reforming permits, building stockpiles. That is the dossier's central asymmetry: vulnerability is created fast, it is repaired slowly.
The levers of response
①
Recycling and substitution. Copper recycles indefinitely without losing its qualities: it is the fastest mine to open.
②
Diversify refining, not just mining. The real chokepoint is the smelter: without capacity outside China, multiplying mines is not enough.
③
Stockpiles and supply agreements. To cushion the blows and buy the time the projects demand.
The compass
Behind the price of a metal, a question of shared sovereignty: whoever controls the inputs of the transition controls its pace. For the investor, structurally supported but volatile prices, and non-Chinese smelters under pressure. For the citizen, the awareness that the electric car, the wind turbine and the data centre rest on a metal whose chain is held in a few hands.