DR Congo Opens Uranium-in-Cobalt Investigation as Critical Minerals Collide With Nuclear Oversight

The Democratic Republic of Congo has launched a formal investigation into uranium associated with its vast cobalt export industry, transforming an emerging scientific controversy into a potentially important test of how African critical-mineral governance intersects with nuclear safeguards, radiation protection and international oversight.

The government response follows the publication of peer-reviewed research estimating that between 2,000 and 5,000 tonnes of natural uranium may have left the DRC embedded in cobalt-hydroxide exports between 2000 and 2024.

Congolese authorities have challenged aspects of those estimates and say further measurements are needed. But rather than simply dismissing the findings, the government has announced additional testing, an inter-agency investigation and consultations with the International Atomic Energy Agency with a view to obtaining technical assistance.

The development makes the story considerably larger than a question about uranium contamination in cobalt.

It raises a broader African policy problem: what happens when a critical-mineral supply chain unintentionally becomes a pathway for material that also falls within the nuclear-governance system?

For a continent rapidly expanding production of cobalt, copper, lithium, rare earths and other strategic minerals, the answer could have implications far beyond the DRC.

Government Moves From Dispute to Investigation

The DRC Ministry of Mines has now publicly addressed what it describes as traces of uranium in certain cobalt-hydroxide exports, issuing an official communiqué through its institutional social-media channels. The Ministry’s LinkedIn account identifies itself as the official page of the national mining ministry and links directly to the government’s mines website.

The Congolese government says it will undertake further analyses and establish a working mechanism to investigate the findings.

According to the Financial Times, authorities intend to test uranium levels in cobalt hydroxide, involve relevant Congolese nuclear institutions and laboratories and consult the IAEA about a possible technical-support mission. The investigation is expected to produce findings within approximately 60 days.

The government’s response is important because it does not amount to acceptance of the scientific study.

Authorities have questioned whether the modelling used by the researchers accurately reflects material exported from individual mines and have stressed the need for direct testing.

That distinction should remain central to reporting on the case.

The estimated uranium quantities have not yet been independently confirmed through a government inventory of exported material.

What the Study Actually Found

The research behind the controversy was published in Nature Communications on 30 July by Ryan Manzuk and Sébastien Philippe.

The researchers examined the geology and chemistry of the DRC Copperbelt, where cobalt and uranium can occur within the same mineralised formations.

Their argument is based on the way uranium can move with cobalt during mining and hydrometallurgical processing.

The researchers combined geological mapping, mineralisation and geochemical information with mine-level trade records covering 2000–2024 and a first-order model estimating the proportion of uranium likely to remain associated with cobalt hydroxide during processing.

Their resulting estimate is substantial: approximately 2,000–5,000 tonnes of natural uranium may have been exported embedded within cobalt-hydroxide shipments during the 24-year period.

The study also estimated that another 1,000–4,000 tonnes could have accumulated in mining tailings in forms the researchers say may present environmental and occupational-health concerns.

The researchers describe the findings as revealing a gap between critical-mineral production, nuclear material accounting and environmental oversight.

But modelling is not measurement.

That is precisely why the new Congolese investigation matters.

Uranium Was Not Necessarily Being Deliberately Mined

One of the most important distinctions in the story concerns intent.

Uranium occurs naturally in parts of the DRC Copperbelt.

The presence of uranium in a cobalt-bearing ore therefore does not prove that a mining company deliberately extracted uranium as a commercial nuclear material.

Study co-author Sébastien Philippe has explicitly said the research does not show that uranium was deliberately exported from the DRC for the purpose of obtaining uranium.

The underlying process can instead arise because several elements occur in the same geological system.

Mining companies may target cobalt or copper, but other elements can enter the processing stream with the desired mineral.

For policymakers, however, accidental co-extraction does not remove the governance question.

If uranium becomes sufficiently concentrated during processing and subsequently crosses an international border, governments need mechanisms capable of recognising what material is moving, its concentration, where it is going and which regulatory rules apply.

A Nuclear Safeguards Question — But a Complicated One

Some reporting on the study has described the material simply as “unsafeguarded uranium”.

The legal and safeguards position requires more precision.

Under the IAEA’s comprehensive safeguards system, uranium and thorium in mining and ore-processing activities are not automatically subject to the full set of nuclear-material safeguards procedures applied farther downstream in the nuclear fuel cycle.

However, comprehensive safeguards agreements contain reporting provisions relating to certain imports and exports of material containing uranium or thorium before that material reaches the processing stage at which it is normally subject to full safeguards procedures.

Additional Protocol arrangements can also require information relating to specified quantities and movements of source material.

That makes factors such as the uranium’s physical and chemical form, concentration, processing stage, quantity, declared end use and destination important when determining applicable reporting requirements.

Consequently, the scientific estimate cannot on its own establish that every tonne included in the model represented a safeguards violation.

The IAEA’s own safeguards framework distinguishes between material in mining and ore-processing activities and material that has progressed farther into the nuclear fuel cycle.

This is one reason an eventual IAEA technical assessment could be valuable.

It could help clarify how the particular material streams identified in the DRC should be characterised and how national reporting, radiation monitoring and safeguards arrangements should interact.

The IAEA Dimension Needs Careful Reporting

The Congolese government has said it intends to consult the IAEA with a view to securing technical support.

That does not yet mean the Agency has dispatched or scheduled a formal mission.

NuclearAfrica understands the distinction to be important because IAEA involvement can easily be overstated in public reporting.

At this stage, the verified milestone is:

DRC government investigation → planned consultations with the IAEA → possible technical-support mission.

It is not:

IAEA investigation completed → safeguards violation established.

Independent reporting associated with the original investigation also provides an important counterpoint.

Lighthouse Reports says an IAEA expert indicated that the Agency believed the DRC was meeting its safeguards obligations, while noting that uranium associated with cobalt may frequently enter mining waste streams.

That assessment sits alongside the researchers’ concern about possible reporting gaps and reinforces why the case should be investigated rather than prejudged.

Critical Minerals Meet Nuclear Regulation

The wider significance of the controversy lies in the institutional gap it exposes.

Mining regulators generally focus on resource extraction, mine safety, environmental obligations, royalties and mineral exports.

Nuclear and radiation regulators focus on radioactive materials, radiation exposure, nuclear safety, security and safeguards obligations.

Customs authorities oversee the movement of goods across borders.

Environmental agencies monitor contamination.

Health authorities oversee worker and public exposure.

But a cobalt-hydroxide shipment containing uranium can touch all of those regulatory systems simultaneously.

If institutions operate independently without adequate information sharing, such mixed-material supply chains can fall between regulatory mandates.

That is a lesson with continental relevance.

Why This Matters for Africa

Africa is emerging as one of the world’s most important suppliers of minerals required for electric vehicles, renewable-energy systems, digital technologies and advanced manufacturing.

Many of these minerals occur in complex geological settings rather than in isolation.

The DRC case demonstrates why critical-mineral strategies should therefore include radiological and nuclear-material characterisation, particularly where uranium and thorium are known to occur alongside commercially targeted ores.

Countries developing or expanding mining sectors may need to consider an integrated chain of oversight:

geological characterisation → mine radiation monitoring → processing controls → product assay → material classification → export certification → customs detection → nuclear regulatory reporting.

This does not mean every truck carrying mineral concentrate should automatically be treated as carrying nuclear material.

It means regulators should know enough about the material being exported to determine when nuclear or radiation rules become relevant.

Radiation Protection May Be the More Immediate Risk

International discussion has understandably focused on safeguards and non-proliferation.

But for communities and workers in the Copperbelt, radiation protection may be an equally important issue.

The Nature Communications study estimates that significant quantities of uranium may also have been deposited in mining tailings.

If confirmed, that could create long-term questions surrounding occupational exposure, tailings management, contaminated water, environmental monitoring and remediation.

The University of Wisconsin researchers consequently recommend improved uranium accounting, systematic assays of cobalt-hydroxide shipments and stronger radiation monitoring for workers.

This reinforces a broader policy point.

A nuclear-governance failure does not have to involve a reactor or a nuclear facility.

Radioactive-material risks can originate inside conventional mining industries.

African radiation regulators therefore need sufficient legal authority, equipment and human resources to oversee naturally occurring radioactive material where industrial processes concentrate it to levels that warrant regulatory attention.

The Mineral-Processing Question

The controversy also intersects with Africa’s continuing debate about local value addition.

The DRC has been attempting to increase the share of mineral processing conducted domestically rather than exporting low-value intermediate products.

On 6 August, Reuters separately reported new Congolese restrictions on exports of copper and cobalt concentrates as the government seeks to promote greater domestic processing.

The uranium issue adds another dimension to that strategy.

Greater domestic refining could give authorities more visibility and control over impurities and by-products before mineral products enter international markets.

But domestic processing would also create additional responsibilities.

If refining separates or concentrates uranium, the country would need appropriate licensing, radiation protection, material accounting, waste management and safeguards arrangements.

Value addition therefore cannot be separated from regulatory capability.

Industry Positions Must Also Be Heard

Mining companies named in the wider investigation have disputed some of the allegations.

Lighthouse Reports says CMOC rejected claims that its cobalt products exceeded applicable uranium limits and maintained that material from Tenke Fungurume complied with regulatory requirements.

Other operators have said they follow applicable national and contractual controls, while companies processing cobalt containing uranium have described uranium as an incidental impurity rather than a commercial co-product.

These responses are relevant.

The government’s forthcoming measurements could provide the first opportunity for the competing positions to be tested against a nationally coordinated dataset.

What Should Happen Next?

The most important immediate step is credible measurement.

The government investigation should establish representative sampling protocols covering major cobalt-producing operations and export routes.

Results should ideally distinguish between different mines, processing methods, product forms and uranium concentrations rather than reporting a single national average.

Institutional responsibilities should also be clarified.

Mining authorities, the country’s nuclear institutions, customs services, environmental regulators and health agencies need an agreed mechanism for handling cobalt products where uranium is present above relevant regulatory thresholds.

External technical support could help strengthen that system, but national ownership will be essential.

Transparency will matter as well.

Publishing the methodology and results of the promised investigation would allow researchers, industry and international institutions to compare measured data against the existing model.

That would help move the debate from allegation and counter-allegation towards evidence.

A Wider Continental Warning

The significance of the DRC case extends beyond cobalt.

African mining economies increasingly face situations in which commercially targeted minerals occur alongside uranium, thorium or other naturally radioactive materials.

As the global race for critical minerals accelerates, governments cannot assume that mining governance and nuclear governance occupy entirely separate worlds.

They increasingly overlap.

That overlap creates an opportunity as well as a risk.

African states could develop a new generation of mineral-governance systems capable of simultaneously tracking economic value, environmental impacts, radiation hazards and strategic-material flows.

The DRC investigation may therefore become an important precedent.

If the government’s testing confirms significant uranium movement, the country will need to strengthen the way uranium-bearing cobalt is characterised and regulated.

If the measurements substantially contradict the academic estimates, the results will still be valuable because they will establish a stronger empirical basis for oversight.

Either outcome should improve understanding.

What This Means for Africa

The most important lesson is not that African cobalt exports should automatically be viewed through a proliferation lens.

That would be misleading.

The lesson is that Africa’s critical-mineral boom is producing increasingly complex governance challenges.

A material can be commercially valuable as cobalt, environmentally significant as a mining contaminant, radiologically important because of uranium content and potentially relevant to international nuclear reporting—all at the same time.

Institutions designed to regulate only one of those dimensions may miss the others.

For African governments, the future of critical-mineral governance therefore requires better integration between mining regulation, radiation protection, customs control, nuclear safeguards and environmental monitoring.

The DRC now has an opportunity to demonstrate how that integration can work.

Its promised investigation should be judged not by whether it confirms or rejects one academic estimate, but by whether it produces a credible system capable of ensuring that the country knows what strategic materials leave its mines, where they go and under which regulatory framework they belong.

That would turn a controversy over cobalt exports into something more constructive:

a model for governing the increasingly blurred boundary between Africa’s critical-mineral economy and its nuclear responsibilities.