We picture power in barrels of oil, in aircraft carriers or in billions of dollars. Sometimes it lodges in a grey metal no one notices, worth a few dollars a pound. Antimony makes the front page of no newspaper; it weighs almost nothing in the cost of a shell. But without it, the primer does not ignite, the bullet does not harden, and the weapon, quite literally, falls silent. A single country refines most of it. In September 2024, it tightened the tap. Here is why an obscure metal has become a matter of national security.
1 The metal no one looks at
A paradox: unremarkable on the market, vital in the arms factory.
Portrait
"A critical material you've probably never heard of"
Antimony (symbol Sb) is a silvery metalloid, drawn from a black ore, stibnite. It is discreet in price too: long cheap, it was worth about $12,000 a tonne in 2023, a pittance measured against its importance. The phrasing comes from the US International Trade Commission itself: "a critical material you've probably never heard of". The whole subject lies in that contrast: a market triviality that masks a strategic criticality. For this obscure metal is the hidden link in entire industries, beginning with that of munitions.
2 Why weapons fall silent
The concrete chain: no antimony, no shot.
The vital link
The spark of the primer, the hardener of the bullet
When the firing pin strikes the cartridge, it is an antimony compound, antimony trisulfide, that ignites in the primer and sets fire to the powder: without that spark, the shot does not go off. Antimony also serves to harden the lead of bullets, shells and armour-piercing projectiles, to make tracer munitions and detonators. Its military uses go further still: night vision, infrared sensors, precision optics, nuclear applications. The US Army describes antimony trisulfide as "essential and non-replaceable" for munitions, and the US Geological Survey lists no substitute for that use. Without antimony, in time, weapons fall silent.
3 More than a weapon
Its criticality spills beyond the military field, which makes any shortage worse.
Demand
A metal of war and of daily life
Antimony is not only a metal of war. In the United States, its demand splits (2026 data from the Geological Survey) between flame retardants and metal products (49%), antimonial lead and munitions (40%), and non-metallic products such as glass and ceramics (11%). It is found in lead-acid batteries, as a catalyst for PET plastic, in semiconductors. This dual nature, civilian and military, makes any shortage doubly awkward: it strikes both the arsenal and ordinary industry at once, and sets the needs of defence against those of the economy.
4 The real lock is not the mine
The key to the file: dependence is settled at refining, not at extraction.
The asymmetry of the chain
Extracting is easy, refining is the bottleneck
It is often believed that dependence rests on geology: whoever holds the ore commands. That is false. Power lodges in the middle of the chain, at refining, the technical step that turns raw ore into usable metal and oxide. China accounts for only about 48% of world antimony mine output (it even shares the top rank with Russia), but it refines more than 80% of it. Better still: ore mined elsewhere converges on its plants. About 78% of Tajikistan's antimony exports and 86% of Australia's go to China to be processed. The lock is not the mine: it is the furnace.
The mine
≈ 48%
China's share of mine output (2023), level with Russia.
Refining
> 80%
China's share of the world's refined antimony: there lies the real lever.
5 When dependence becomes a weapon
The 2024 tipping point: the dominant position turns into a lever.
Weaponized interdependence
Closing the tap, by design
In 2024, Beijing turns its dominance into an instrument. On 14 August, China announces that the export of antimony ore, metal and oxide will require a licence from 15 September. Then, on 3 December 2024, in the wake of a US tightening on semiconductors, it bans outright the export of antimony to the United States, invoking its civilian and military "dual use". The immediate effect: Chinese shipments collapse by about 97%. The political scientists Henry Farrell and Abraham Newman gave this mechanism a name: "weaponized interdependence". When a state holds a central node of a global network, it can cut off access and inflict a brutal cost on its target. Antimony has become the textbook case.
6 The surge of a cheap metal
The consequence in figures, and the paradox of the disproportionate lever.
The price shock
Multiplied by five in two years
The market reacted violently. From about $12,000 a tonne in 2023, the price of antimony climbed towards $40,000 in late 2024, after the restrictions, then peaked around $60,000 in the summer of 2025, before easing back towards $45,000 at year-end. The data provider Fastmarkets calls it the sharpest rise ever recorded since it began tracking the metal. The paradox stands there, entire: the absolute value remains modest compared with other metals, but the strategic leverage is immense. Cutting off access to a low-cost input is enough to halt entire production chains, and to send a long-dormant market soaring.
7 China's arsenal
Antimony is only one arrow: the quiver is far wider.
A portfolio of levers
A dominance deployed, material after material
Antimony is not an isolated case, but one link in an arsenal that Beijing can pull one after another. According to the International Energy Agency, China is the leading refiner for 19 of the 20 strategic minerals, with an average share of about 70%. And it uses that power in successive waves: controls on gallium and germanium (two semiconductor metals) as early as July 2023; on graphite in late 2023; on antimony in 2024; a tightening on rare earths and permanent magnets in 2025. Each time, the same justification: national security and "dual use".
Gallium (semiconductors)
≈ 98%
of world primary production; controlled as early as 2023.
Rare earths & magnets
≈ 90%
of world refining, and about 93% of permanent magnets.
The double edge
This control cuts two ways. The first, obvious: cutting off access to inflict a cost (the "chokepoint" effect). The second, quieter: the licensing regime forces every foreign buyer to declare itself, revealing to Beijing who buys what, in what quantity, for what use — a precious piece of industrial and military intelligence. Tungsten, another "metal of munitions" largely dominated by China, is often cited as the next potential target. The message sent to Western capitals is plain: your military apparatus depends on our plants.
8 The family of chokepoints
The lesson is not only Chinese: the bottleneck lies wherever things are processed.
The pattern repeats
Every power has its lock
Antimony belongs to a family of indispensable materials, each with its bottleneck, and not always Chinese. Aeronautical titanium: before 2022, Boeing imported up to about 80% and Airbus around 60% of their titanium from Russia's VSMPO, the world's leading producer of titanium sponge; the United States, for its part, produces not an ounce and imports all of theirs. The war in Ukraine brutally recalled this dependence, and reshuffled the supply of a metal without which neither aircraft nor missile flies. Sulfuric acid: the most manufactured chemical in the world, indispensable to fertilizers, ore processing and batteries, of whose sulfur more than 80% comes from the refining of fossil fuels — so that decarbonization, paradoxically, threatens its very source. And finally copper, whose supply could fall short by about 30% by 2035. The common thread: in each case, power does not rest on the scarcity of the ore, but on the concentration of the narrow step that transforms it.
9 The Western response, and its limits
A real counter-offensive, but slow and double-edged.
Rebuilding a supply chain
Reopening mines, rebuilding furnaces
The West has reacted. In the United States, the Stibnite mine in Idaho, carried by Perpetua Resources, received its permits in 2025 and benefits from about $80 million from the Department of Defense and a $2.9 billion loan from the US Export-Import Bank: in time, it could cover nearly 35% of the country's demand. Australia is reviving the Hillgrove project; strategic stockpiles are being rebuilt; recycling already supplies about 12% of US consumption. But rebuilding a complete supply chain, mine and refining, takes years.
The honesty of the counterpoint
The weapon of raw materials has its limits, and they must be stated. Stibnite output is not expected before 2028; the Sino-American trade truce of November 2025 suspended some controls without abolishing them, and remains reversible. Above all, restricting access accelerates diversification on the adversary's side: this is the boomerang effect. Substitution exists, but on a scale of several years. And the risk is not nil of simply shifting the dependence from one sole supplier to another. The weapon is therefore real in the short term, but it blunts over the long term: it is a double-edged blade, for the one who wields it as for the one it targets.
10 The nail and the kingdom
The moral of a metal worth a few dollars a pound.
The lesson
For want of a nail the kingdom was lost
An old proverb tells how, "for want of a nail the shoe was lost; for want of a shoe the horse was lost; for want of a horse the rider was lost; for want of a rider the kingdom was lost". Antimony is that nail: derisory in value, decisive in its absence. Its story sums up a law of the age: power is no longer measured only in barrels of oil or in billions of dollars, but in the control of the invisible bottlenecks through which the essential passes. Whoever holds the narrow step of refining holds the whole chain. And an obscure metal, worth a few dollars a pound, can decide whether weapons thunder or fall silent.
The compass
①
An obscure metal, but vital. Antimony is the spark of primers and the hardener of bullets: without it, weapons fall silent, and the USGS knows of no military substitute for it.
②
The lock is at refining. China refines more than 80% of the world's antimony (versus ~48% of the mine) and weaponized it in 2024: this is "weaponized interdependence", and antimony is only one arrow of an arsenal (gallium, rare earths, tungsten).
③
A double-edged weapon. The Western response is real but slow (~2028), and restricting access accelerates diversification. This sheet sheds light on a geopolitical debate; it does not offer investment advice.
Same bottlenecks, other theatres
Antimony joins two files already explored:
the battle for copper, where structural shortage becomes a matter of sovereignty, and
Taiwan's silicon shield, another chokepoint of a global chain. Three materials, three theatres, one and the same lesson: power nests in the links we do not see.
Read alongside: The battle for copper and The silicon shield, same bottlenecks, other theatres. Reference: abbreviations & acronyms (USGS, IEA, Sb).