The expansion of AI infrastructure has begun to shake metal markets beyond semiconductors themselves. According to China Fund News, tantalum ingot prices rose 158% between the end of 2025 and June 1, 2026, while indium also climbed roughly 60% from the start of the year through mid-June. Tin reached 450,000 yuan per ton in early June before quickly pulling back. Lumping the three together as "computing metals" makes them look like a single market trend, but the roles they play inside AI equipment and the supply constraints behind them are entirely different. To gauge how sustainable these prices are, we need to examine demand and supply separately for each metal.
The 158% Figure Applies Only to Tantalum Ingot
The 158% figure compares tantalum ingot prices between the end of 2025 and June 1, 2026. According to domestic pricing reported by China Fund News on June 15, the price rose from 2,600 yuan to 6,700 yuan per kilogram. Calculating the rate of increase yields 157.7%, matching the reported 158%. Indium also rose from 2,960 yuan per kilogram at the start of the year to 4,720 yuan by mid-June, a 59.5% increase.
Tin's price movement must be viewed as both a rise and a subsequent pullback. China Fund News reported that the per-ton price climbed from about 300,000 yuan in November 2025 to 450,000 yuan in early June 2026, before falling back to roughly 398,000 yuan. That represents an 11.6% decline from the early-June peak. The figure "40% up in half a year" captures the upward phase, but the price did not move in one direction throughout.
These three percentage changes are not components of the same index. Tantalum is measured as ingot, indium as refined metal, and tin as a domestic per-ton price—differing in both grade and reference dates. While the numbers each capture tightness in their respective markets, the ranking of 158%, 60%, and 40% cannot simply be read as a ranking of AI demand intensity.
Three Metals Supporting Assembly, Power Supply, and Optical Transmission
Tin goes into the solder that connects chips to substrates. In advanced packaging, chiplets and stacked components are connected through numerous contact points, so as assembly density increases, so does demand for solder material. CCTV Finance's industry survey reported that tin usage per AI server unit is more than three times that of conventional servers, while China Fund News reported more than four times. However, the server configurations and comparison baselines were not disclosed. What can be confirmed is that usage exceeds that of conventional servers.
Tantalum is used in electronic capacitors that require small size and high reliability. AI servers contain more components that must supply stable power to high-output processors, pushing up tantalum demand. Meanwhile, USGS lists aluminum, ceramics, and niobium as alternative materials for capacitors, but notes that substitution can involve performance degradation or higher costs depending on the application. Even as prices rise, switching to alternative materials is not necessarily straightforward.
Indium plays its role on the optical communication side. According to USGS, indium phosphide (InP) is used in high-speed photodetectors and laser diodes, transmitting and receiving data through optical fiber. As connection speeds within data centers increase, so does the need for InP elements used in optical transceivers. Tin supports assembly, tantalum supports power circuits, and indium supports optical transmission. "Computing metals" is not a single application category but a market term that bundles together different uses and functions within AI equipment.
Why Supply Concentration Matters More Than Demand Growth
Tantalum mining is heavily skewed toward central Africa. According to USGS's 2025 estimates, of the 2,500 tons of global mine production, the Democratic Republic of the Congo accounted for 1,300 tons and Rwanda for 400 tons. Together, the two countries account for 68%. If shipments are halted due to a mining accident or regional instability, even a small increase in demand can quickly ripple through to ingot prices.
Indium refining shows an even clearer concentration in China. USGS estimated global production at 1,100 tons in 2025, with China accounting for 760 tons—a ratio of about 69%. Moreover, indium is not a metal extracted in large quantities from dedicated mines; it is mainly recovered as a byproduct of zinc sulfide ore processing. Even if indium prices rise, supply cannot keep pace unless zinc mining and refining processes can be quickly expanded.
Tin's supply is more geographically dispersed than the other two, but that does not mean there is ample slack. Against global mine production of 290,000 tons in 2025, China produced 71,000 tons and Indonesia 61,000 tons. Myanmar's production fell 40% from 20,000 tons the previous year to 12,000 tons. Even if the increment tied to AI equipment represents only a fraction of total demand, when it coincides with reduced output from major producing regions, it is enough to push prices higher.
The Gap Between 3.3% Production Growth and 99.4% Profit Growth
According to China's National Bureau of Statistics, production of the ten major non-ferrous metals in the first half of 2026 reached 41.51 million tons, up 3.3% year-on-year. In contrast, profits in the non-ferrous metal smelting and rolling industry rose 99.4%. Copper smelting profits rose 53.9%, while aluminum smelting profits rose 117.1%. Profit growth far outpacing volume growth indicates that high metal prices have flowed through into upstream and refining margins.
The price increases did not suddenly begin in 2026. According to first-quarter average prices compiled by China's Ministry of Industry and Information Technology, year-on-year increases were 30.5% for copper, 17.3% for aluminum, and 48.6% for tin. AI infrastructure has boosted demand, but export restrictions, reduced mine output, and thin inventories were also at work simultaneously. Because minor metal markets are small in scale, they tend to swing more sharply from capital inflows and outflows than physical supply and demand alone would suggest.
The indicators that procurement teams should track also differ by metal. For tin, it's production recovery and inventory levels in major producing regions; for tantalum, shipments from the Democratic Republic of the Congo and Rwanda; and for indium, China's refining output and increases in InP substrate production—these serve as leading indicators. If recycling and alternative materials increase, the pressure will ease. Conversely, as long as supply concentration remains unresolved while optical communication and AI server production continue to expand, the surge in "computing metals" will not remain merely a speculative theme—it will persist as a procurement challenge constraining component makers' delivery times and costs.