When Donald Trump and Xi Jinping shook hands in Busan last October, the White House declared a victory: China would pause its sweeping rare-earth export controls for a year. But buried in the fine print was a different story. Beijing simultaneously introduced binding new export restrictions on silver, antimony, and tungsten, materials just as critical to American defence and industry, in a move analysts are characterising as a deliberate long-game strategy to trade short-term concessions for lasting leverage over the minerals that underpin modern civilisation.
Introduction
On the morning of October 30, 2025, aides to Donald Trump and Xi Jinping were still ironing out the language of a joint communique when China's Ministry of Commerce quietly published a separate document on its website. The Busan summit, convened in a South Korean coastal city more accustomed to container traffic than superpower diplomacy, was about to produce what the White House would call a historic minerals truce. Yet the MOFCOM notice, timestamped within hours of the two leaders meeting, outlined new state-trading rules governing exports of tungsten, antimony, and silver. The rules would take effect on January 1, 2026.
The juxtaposition was not accidental. While American headlines spent the following week celebrating relief from China's rare-earth export curbs, the new controls on three equally strategic metals were entering their implementation phase in near-total silence. By the time most Western policymakers noticed, the licensing frameworks were already operational, the approved exporter lists had been published, and prices in international markets had begun their ascent.
The episode illustrates what a growing chorus of analysts describes as Beijing's most sophisticated geoeconomic manoeuvre to date: the deliberate use of a high-visibility concession to obscure a suite of lower-profile restrictions that collectively tighten China's grip on the materials undergirding American defence, semiconductor manufacturing, clean energy, and advanced industry. As Olena Borodyna, a senior geopolitical risks adviser at the ODI think tank, put it in a recent assessment, "the past year has exposed persistent U.S. supply chain vulnerabilities to geoeconomic coercion, with Beijing successfully leveraging raw material dependencies in trade negotiations to negotiate tariff reductions." The rare-earth truce, she argued, was the price Washington paid. The controls on silver, antimony, and tungsten were what Beijing kept.
The Fine Print Nobody Read
To understand what was actually agreed at Busan, it helps to read both documents that emerged from those negotiations: the White House fact sheet and MOFCOM's formal announcement. They do not say the same thing.
The White House fact sheet stated that China agreed to issue general licences covering exports of rare earths, gallium, germanium, antimony, and graphite for the benefit of U.S. end users. MOFCOM's official remarks, published on November 7, described a suspension of six specific October 9 announcements (numbered 55, 56, 57, 58, 61, and 62) until November 10, 2026. Critically, the word "relevant" appeared throughout the Chinese text as a qualifier for which controls were paused. Analysts at Clark Hill, an international trade law firm that has closely tracked China's export control escalation, noted that this language left the scope of the suspension deliberately ambiguous.
The practical consequence is significant. China's April 4, 2025 controls on seven medium and heavy rare earth elements, including dysprosium, terbium, samarium, gadolinium, lutetium, scandium, and yttrium, were never suspended. These materials, which flow into the NdFeB permanent magnets used in electric vehicle motors and defence systems, remain under a strict licensing regime that Chinese authorities have been applying selectively. According to analysis from Wood Mackenzie, Chinese authorities approved only around 25 percent of export licence applications submitted by automotive suppliers during April 2025 alone, contributing to a 58.5 percent year-on-year collapse in rare earth magnet exports to the United States that month.
The automotive consequences were concrete and humiliating. Ford Motor Company suspended production of its Explorer SUV for a full week at its Chicago assembly plant in May 2025 due to a shortage of rare earth magnets. BMW, Suzuki, and several European automakers reported disruptions ranging from supplier delays to month-long production halts. Thomas Jones, senior rare earths analyst at Wood Mackenzie, observed that "the sudden drop in exports has exposed the automotive industry's vulnerability to supply chain disruptions. With China controlling over 90 percent of global processing capacity for rare earth magnets, the impact on vehicle production has been severe and far-reaching."
In exchange for suspending the October 9 escalation (not the April baseline), the United States removed ten percentage points from tariffs related to fentanyl-flow penalties, suspended implementation of an end-user controls rule covering affiliates of listed entities, and maintained its broader tariff suspension through November 2026. Washington, as one analyst at Rare Earth Exchanges bluntly summarised, "traded away some leverage in exchange for what certainly seems like an ambiguous promise."
Three Metals, One Strategy
Silver, antimony, and tungsten do not share a periodic table neighbourhood or a common industrial application. What they share is a different kind of geography: the overwhelming majority of the world's refined supply of all three passes through Chinese facilities before reaching global markets.
China controls 60 to 70 percent of the world's refined silver supply, according to the London Bullion Market Association, which counts 27 Chinese-accredited silver refineries, more than double the number in Japan, the next largest centre. China is also the world's largest producer of tungsten, accounting for over 80 percent of global supply according to the U.S. Geological Survey, and the leading producer of antimony, responsible for 48 percent of global mine output and 63 percent of U.S. antimony imports. The United States has mined no antimony domestically since the closure of the Sunshine Mine in Idaho in 2001 and stopped domestic tungsten mining entirely in 2015.
The new MOFCOM rules, effective January 1, 2026, govern state-traded exports of all three metals for the 2026-2027 period under the stated rationale of protecting resources and the environment. The environmental framing is being received with open scepticism. "The rhetoric rings familiar as policy cover for supply-chain leverage," said Faysal Amin, a financial analyst who covers Chinese commodity markets. "There is no evidence that these new quotas are primarily ecological; rather, they appear designed to reward state-favoured exporters and tighten pricing control heading into 2026."
The structural details of the new regime confirm that reading. Only 44 companies have been authorised to export silver; 15 firms for tungsten; 11 for antimony. To qualify, enterprises must hold independent legal person status, maintain a bank credit line of no less than 200 million yuan, demonstrate annual production capacity of at least 80 tonnes of silver, and prove substantial export volumes during the 2022-2024 baseline period. The effect, as analysts at Quest Metals noted, is to consolidate export access among large, state-favoured enterprises while effectively sidelining the hundreds of smaller producers who have historically served as suppliers to global industrial users and refineries outside China.
A source cited in China's state-run Securities Times put the strategic elevation plainly: the new policy formally lifts silver from an ordinary commodity to a strategic material, placing its export controls on the same regulatory footing as rare earths. That reclassification matters enormously, because it signals Beijing's intent to use silver as an instrument of the same kind of supply-chain leverage it has been developing with rare earths since 2023.
When Prices Speak Louder Than Policy
Markets have rarely needed policy briefings to understand the direction of Chinese export controls. They price it in immediately.
Silver more than doubled in price through 2025, putting it on course for its strongest year since 1979, when the Hunt Brothers' silver corner sent prices surging by nearly 470 percent. Spot silver briefly touched a record above $80 an ounce before retreating to around $73 at the time of writing. The price signal has already reached producers far from China: Canada-based Kuya Silver's chief executive David Stein confirmed that his company received unsolicited offers from two Chinese firms to purchase physical silver at approximately $8 above prevailing market prices, followed by an Indian buyer offering $10 above market. The scramble for physical supply was well underway before the formal 2026 controls took effect.
The solar industry is watching with particular alarm. Each solar panel requires approximately 20 grams of silver for conductive efficiency, and the International Energy Agency projects that the global solar sector could account for 40 percent of total silver demand by the end of the decade. Electric vehicles each consume up to two ounces of silver in sensors, wiring, and power modules. If Chinese silver exports decline by 50 percent, analysts estimate annual deficits could exceed 5,000 metric tonnes. Elon Musk, whose Tesla and SolarCity operations sit squarely in the path of any silver supply disruption, was characteristically direct on his social media platform X: "This is not good. Silver is needed in many industrial processes."
Antimony's price history is even more dramatic, and its defence implications sharper. When China began restricting antimony exports in August 2024 and then imposed explicit controls on U.S.-bound shipments in December 2024, prices surged from multi-year lows to nearly $51,500 per tonne, approximately ten times the five-year average. Shipments from China to the United States dropped 97 percent between August and December 2024. The U.S. Department of Defense uses antimony in over 200 types of ammunition, yet domestic production remains virtually nonexistent. Antimony is essential for armor-piercing rounds, night vision goggles, infrared sensors, and the flame retardants that prevent naval and aviation fires.
For tungsten, the German Mineral Resources Agency (DERA) confirmed that prices for tungsten concentrate more than doubled at times in 2025, with ferrotungsten recording a monthly price increase of over 20 percent in September alone. Lewis Black, chief executive of Almonty Industries, one of the West's primary tungsten producers, described Beijing's export quotas as a de facto wake-up call. "There is no substitute for tungsten in most applications," Black said. The company is among a handful of non-Chinese producers scrambling to fill the gap, in a market valued at $7.3 billion in 2025 and projected to reach $11.6 billion by 2035.
The Architecture of Dependency
Building on my analysis of Washington's critical minerals architecture in March 2026, and the subsequent acceleration of U.S.-Australian investments I reported in April, the uncomfortable truth is that the policy responses assembled so far remain structurally mismatched to the scale and immediacy of Beijing's leverage.
The United States relies entirely on imports for 12 critical minerals and maintains over 50 percent import dependency for 29 others, according to the U.S. Geological Survey. For gallium and germanium, the figures approach 95 to 100 percent. For antimony, 85 percent. The IEA's Global Critical Minerals Outlook 2025 found that for 19 out of 20 important strategic minerals, China is the leading refiner, with an average market share of 70 percent. That concentration, the IEA noted, has only intensified in recent years.
China's October 2025 controls, the ones technically suspended under the Busan deal, introduced an additional layer of systemic risk through extraterritorial provisions. Under rules effective from December 1, 2025, foreign manufacturers whose products contain more than 0.1 percent Chinese-origin rare earth materials by value may be required to seek MOFCOM approval before exporting to a third country. The "0.1 percent rule," as it has been dubbed, effectively extends Beijing's regulatory jurisdiction across supply chains that have been deliberately constructed to bypass Chinese chokepoints. It means that a European defence contractor using a tiny quantity of Chinese-origin dysprosium in an alloy is, in theory, subject to Chinese export control law regardless of where the final product is manufactured or sold.
The U.S. response has been energetic but honest about its timescales. The Department of Defense contracted for $245 million in antimony offtake with U.S. Antimony Corporation and awarded an $80 million grant to Perpetua Resources, which is developing the Stibnite Gold Mine in Idaho. But that project will not begin production until 2028 at the earliest, and it still awaits final permitting. The DoD's goal of a complete mine-to-magnet rare earth supply chain independent of China by 2027 is, as most independent analysts concede, unlikely to be met. Western supply chain alternatives, in the blunt assessment of Clark Hill's trade lawyers, remain five to ten years away.
Kevin Thow, a researcher at the Australian National University writing for the East Asia Forum in March 2026, offered a structural diagnosis: China's export controls were largely a defensive action in retaliation for U.S. restrictions on advanced chip exports and unilateral tariffs, and "critical minerals have become a battlefield in intensifying geopolitical rivalries." That framing matters because it suggests Beijing is not operating from a position of irrational aggression but from a calculated assessment of where its structural advantages lie. And as the SunSirs commodity data service noted in a rare candid analysis of the tungsten and silver measures, the logic is coherent from Beijing's perspective: "Tungsten, tin, and silver are not rare earths, but their effects are similar, if not more concealed."
The "whack-a-mole" metaphor that has taken hold in Washington policy circles captures the tactical frustration but perhaps understates the strategic coherence on the other side. China is not randomly displacing pressure from one mineral to another. It is systematically testing which materials produce the most leverage, at what price points, and under what diplomatic cover. The Busan truce provided three things simultaneously: a positive news cycle for both governments, a reduction in tariff pressure on Chinese exports, and twelve months of runway to embed the silver, antimony, and tungsten controls before the rare-earth question returns to the table in November 2026.
Conclusion: The Calendar Is the Strategy
Return, for a moment, to that MOFCOM notice published on October 30, 2025, the same day as the Busan handshake. The timing, whether coordinated or coincidental, was instructive. Beijing did not wait until the rare-earth truce had settled into public consciousness before announcing the next tier of controls. It published them simultaneously, knowing that the diplomatic spectacle would consume the available attention of journalists, policymakers, and markets.
By the time the silver, antimony, and tungsten restrictions entered force on January 1, 2026, they had been formally operative for two months with minimal Western pushback. The 44 approved silver exporters, the 15 tungsten firms, the 11 antimony companies: these lists were not assembled in a hurry. They reflect a deliberate consolidation of export access among enterprises aligned with Chinese state interests, a process that takes months of regulatory preparation.
The November 2026 deadline, when the suspension of the October rare-earth controls is scheduled to expire, now looms as the next inflection point. Unless a broader trade settlement is reached before then, Beijing will face a choice between reintroducing those controls or extending the truce in exchange for further U.S. concessions. By that point, the silver, antimony, and tungsten frameworks will have been operational for nearly a full year, with their licensing regimes embedded, their approved exporter networks established, and their pricing effects already transmitted through global markets.
In Washington, officials who worked on the Busan framework privately acknowledge the asymmetry. The United States bought a news cycle of relief. China bought a year of consolidation. As one trade attorney who reviewed both the White House fact sheet and the MOFCOM announcement told me, the deal read very differently depending on which document you were holding. "Washington won the press conference," he said. "Beijing kept the periodic table."
That observation echoes the headline concern I flagged in my March 2026 analysis of Washington's 60-day critical minerals architecture: that the gap between the urgency of American industrial policy ambition and the timeline required to build genuine supply chain independence is the central vulnerability that Beijing is now exploiting with considerable precision. The Busan truce did not close that gap. It papered over it, with a one-year expiry date and a set of new controls buried in a document most people never read.