Britain is reopening a tungsten mine it couldn't run. The £71m buys the right to keep half the metal in the country.

Britain's £71m (about $90m) equity stake in the Hemerdon tungsten mine on the outskirts of Plymouth is the price of admission. The strategic tool is sitting next to it in the deal: ministers' right to reserve up to half of the mine's output for British use.

Tungsten is the heat-resistant metal that hardens armour-piercing rounds, drilling bits, and jet-engine components. It is on the UK's critical-minerals list because the country has no domestic production of its own, and because the mines that do exist sit in a small number of jurisdictions, dominated by China.

The Devon deal is the operator's second attempt at the same site. Tungsten West entered administration in 2018 after a tungsten price downturn, warned in 2023 that it was close to insolvency, and recorded losses of more than £10.3m (about $13m) to March 2024 before approaching the government for support. That history is the reason the ringfence matters as much as the cheque.

The National Wealth Fund, the government's sovereign investor, is putting up £36m (about $46m) for a 7% stake in Tungsten West, and a further £35m (about $44m) toward restarting production. The fund says the deal will support around 350 jobs.

Ministers can, if they choose, ringfence up to half of Hemerdon's output for UK buyers. It is conditional, not a guaranteed offtake, and it sits in political rather than commercial territory. The private market never gave the government that lever. The deal does. If tungsten prices fall again, the government's option to reserve output for British buyers is the mechanism that keeps at least some of the metal in the country regardless of what the spot market does.

China dominates global tungsten production, and in 2025 it tightened export controls on the metal and a range of other strategic materials. Tungsten prices rose sharply during the broader US-China trade confrontation that year, which is what made a Devon mine that lost money in 2018 worth another look.

Chancellor John Healey framed the investment as "backing British industry in a more dangerous world"; Business Secretary Jonathan Reynolds called it a vote of confidence in UK critical mineral supply. Both framings lean on the Vision 2035 Critical Minerals Strategy, which treats domestic mining and processing capacity as resilience infrastructure rather than a commercial sector.

£71m is real money, but it is small against the scale of the global tungsten market and even smaller against China's share of it. A single Devon mine does not, on its own, change UK exposure to Chinese export policy. What it does is create a working test of whether sovereign capital, paired with a conditional output reservation right, can keep a previously failed mine in production long enough for downstream refining and processing capacity to come back. If the test works, the same template travels to lithium and tin, both of which South West England also hosts. If it does not, the government's 7% stake is the least of its losses; the more durable one is the credibility of "government as customer of last resort" as a tool.

The first shipment volume, and which of the conditional ringfence triggers ministers choose to pull, will be the real verdict on whether £71m bought a strategic option or a second administration.