⚙️ You have probably never seen one, yet the phone in your hand likely exists because of it. A disk of ultra-pure metal called a "sputtering target" sits at the very start of how the microscopic wiring inside a chip gets laid down — and a single Japanese company makes roughly 60% of the world's supply. That company, JX Advanced Metals, just announced something that sounds backward at first: it is selling off a copper-mine stake it holds in Chile and pouring the proceeds into this little-known material instead.

So what is a sputtering target?

Start with the problem chipmakers face: they need to coat a silicon wafer with metal films only a few atoms thick, perfectly even across the whole surface. Brushing, plating, or printing can't reach that precision. Sputtering can.

Inside a vacuum chamber, an inert gas like argon is turned into plasma, and the charged ions are slammed into a slab of pure metal — the target. The impact knocks atoms loose, and they drift across and settle on the wafer as an ultra-thin film. One Japanese materials engineer describes it as throwing a stone into a pool: the splash is what coats the surface. Those films become the wiring, barrier layers, and seed layers that make a chip work.

The catch is purity. Even trace contamination ruins a device built at the 3-nanometer scale, so the target metal has to be almost flawlessly clean and uniform in its crystal structure. That is hard, and JX Advanced Metals has spent decades getting good at it. The result: about 60% of the world's sputtering targets, plus roughly 80% of the rolled copper foil used in flexible circuits. Its customer list reads like a who's who of the industry — TSMC, Samsung, Intel, SK Hynix, Micron.

A ¥23 billion bet on the AI buildout

On March 10, 2026, JX said it would invest around ¥23 billion (about $140 million) to expand sputtering-target capacity at a new plant it is building in Hitachinaka, Ibaraki Prefecture. The goal is to lift output to 1.6 times the company's fiscal-2023 level, with the new equipment coming online in stages from the second half of fiscal 2027. Some of the gear was due to begin trial runs at the end of March 2026.

The reason is the same force reshaping the whole semiconductor world: the AI data-center boom. Advanced logic chips and high-bandwidth memory (HBM) — the stacked memory that feeds AI accelerators — need more, and more exotic, thin-film layers. More layers means more sputtering targets. JX is betting that demand keeps climbing, and it isn't alone in reading the tea leaves; the company opened a sputtering-target plant in Arizona in late 2024 aimed at the 5- and 3-nanometer processes, part of a broader push to make the supply chain less dependent on any single country.

Selling a copper mine to fund chips

Here's the part that turns heads. On the same day, JX announced it was selling its stake in a Chilean copper operation to Canada's Lundin Mining.

The deal: Lundin pays US$215 million (around ¥34 billion) for an additional 5% of SCM Minera Lumina Copper Chile — the company that runs the Caserones copper-molybdenum mine in Chile's Atacama desert — plus a roughly 31% interest in the nearby Los Helados copper-gold project and a small royalty. The sale, completed in April 2026, drops JX's stake in Caserones from 30% to 25% and lifts Lundin's to 75%. Caserones is no minnow: it produced about 133,000 tonnes of copper in 2025.

So why walk away from a producing copper mine? Because JX has decided what it wants to be. It calls advanced materials — sputtering targets and the rare metals that feed them — its "Focus Business," and it is steering money and attention there. The mine sale isn't an exit from copper so much as a reallocation: the proceeds go straight into the Hitachinaka expansion and into locking up supplies of the rare metals and rare earths those high-purity products need. Tellingly, JX kept preferential rights to buy copper concentrate and refined copper from Caserones even after selling down — it still wants the metal, just not the obligation of owning the hole in the ground.

Why a 120-year-old miner is rewriting its identity

JX Advanced Metals traces its roots to the Hitachi Mine, opened in 1905. For most of that history it was, at heart, a mining and smelting company. The pivot now underway is the clearest sign yet that it sees its future downstream, in the specialty materials that sit between raw ore and finished electronics.

The timing makes sense. JX was spun out of oil giant ENEOS Holdings and listed on the Tokyo Stock Exchange in March 2025 in Japan's largest IPO since SoftBank in 2018, valued at over ¥800 billion. Newly independent, with its own shareholders to answer to, it has every incentive to concentrate on the high-margin niches it dominates rather than compete as one more copper producer. A historically weak yen — hovering near 160 to the dollar in recent months — adds a tailwind for a Japanese exporter selling priced-in-dollars materials to foreign chipmakers.

Not everyone is sold on the logic. Copper is in structural demand for electrification and data centers, and some observers question giving up resource ownership just as that metal looks scarce for years to come. There is also a quieter concern: as Japan trims its direct holdings in overseas mines, does it lean harder on others for the raw inputs its prized materials require? JX's answer — keep the offtake rights, redirect resource hunting toward rare metals and rare earths — is a bet that controlling the refining know-how matters more than controlling the mine. Whether that bet pays off will say a lot about where value really sits in the chip supply chain.

In Japan, the move is being read as a confident company doubling down on what it does best. How would a pivot like this land in your country — as smart focus, or as letting go of something too valuable to sell?

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