How Uranium Slipped Into China-Bound Cobalt

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DR Congo is now looking into reports that uranium rode inside cobalt shipments bound for China, and the finding raises fresh questions about mineral oversight, radiation controls, and who really watched the supply chain.

Quick Take

New research says 2,000 to 5,000 tonnes of uranium may have moved in cobalt-hydroxide exports from the Democratic Republic of Congo between 2000 and 2024.
The peer-review file says less than 10 percent of that material was declared under international standards.
Investigators say some of the uranium was sent to China, while no evidence shows it was meant for weapons.
Kinshasa says uranium is a known geological issue and questions the study’s model-based method.

What the research says

A peer-reviewed study in Nature Communications estimates that cobalt-hydroxide shipments from the Democratic Republic of Congo carried between 2,000 and 5,000 tonnes of natural uranium from 2000 through 2024. The peer-review file says a significant share went to China, less than 10 percent was declared, and as much as 3,000 tonnes may have ended up in unstable tailings inside the country. Reporting around the study says the authors found no evidence of intentional diversion for weapons.

The size of the estimate matters because it points to a long-running gap in mineral screening. The research says uranium was present in cobalt hydroxide, not hidden in a separate nuclear program. That distinction matters for readers who care about honest trade, clean supply chains, and basic state control. It also means the issue is less about a dramatic smuggling plot and more about whether exporters, regulators, and refiners failed to catch a radioactive by-product.

How Congo and industry responded

Congolese officials said the study does not rely on direct measurements from every exported cargo and instead uses a broad model. That response does not deny that uranium can occur in the geology. It does, however, challenge how confident anyone should be in the exact tonnage estimate. The Union of Chinese-Capital Mining Companies in the Democratic Republic of Congo also rejected the allegations as unfounded.

That back-and-forth is familiar in critical-minerals disputes. Governments and companies often argue that trace material is natural and routine, while investigators warn that the same material can still create safety, reporting, and safeguards problems. In this case, the public record already shows one documented instance in Finland where uranium from Congo-origin cobalt shipments was detected, separated, and placed under safeguards. That finding suggests the material can be found when screening is done.

Why the case matters beyond trade politics

The issue reaches beyond a single shipment or one refinery. Congo is a major source of cobalt, and China dominates cobalt refining, so even small gaps in screening can affect a large supply chain. The research and related reporting say the uranium likely traveled as a by-product of cobalt mining, which would make the oversight failure especially troubling for anyone focused on border control, industrial discipline, and energy security.

There is still an important limitation. The available reporting does not provide a complete cargo-by-cargo chain from mine to refinery for the entire period, and the estimate is model-based rather than built from direct sampling of every shipment. Even so, the core finding is clear enough: uranium was present in some Congo cobalt exports, and officials in Kinshasa are now saying they will review the reports while the broader safeguard questions remain open.

DR Congo: 2,000–5,000 tonnes of uranium exported to China hidden in cobalt shipments, investigation finds

A joint investigation by Lighthouse Reports and the Financial Times, published July 30, 2026, traces back to a confidential 2024 IAEA memo. Peer-reviewed research estimates… pic.twitter.com/0pfs66VTjK

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