DRC uranium in cobalt exports: risk, assay and compliance notes for engineers
Reviewed by Tom Sullivan
First reported on MINING.com
30 Second Briefing
The Democratic Republic of Congo has ordered systematic testing of cobalt hydroxide exports, mainly to China’s refineries that handle about 95% of global cobalt refining capacity, after a Nature Communications study estimated 2,000–5,000 tonnes of undeclared natural uranium left the country in cobalt shipments between 2000 and 2024. Researchers also estimate a further 1,000–4,000 tonnes may have entered tailings, prompting Kinshasa to plan radiation detectors on outbound trucks and seek an IAEA technical mission. Chinese operators grouped under USMCC deny excessive uranium levels, citing concentrations too low for economic recovery.
Technical Brief
- Study’s chemical processing model tracks uranium partitioning through cobalt-hydroxide refining, without facility-specific calibration.
- Researchers combined country-scale mineralisation maps, geochemical datasets, mine-level trade records and processing chemistry to infer uranium flows.
- Less than 10% of estimated exported uranium was declared and placed under IAEA safeguards, per co-author Philippe.
- DRC authorities plan a 60‑day programme of cobalt-hydroxide testing using national and international laboratories plus nuclear agencies.
- Radiation detectors are to be installed on outbound trucks at border crossings to screen cobalt shipments in real time.
- USMCC’s internal review reports uranium in cobalt hydroxide only at trace levels, below technical and economic recovery thresholds.
- Chinese operators under USMCC commit to regular sampling, publishing quality-control data and following Congolese rules and international testing standards.
- Government criticism notes model-based estimates lack direct measurements of exported material, prompting a formal counter-verification campaign.
Our Take
With China controlling about 95% of global cobalt refining capacity, any tighter uranium controls on cobalt-hydroxide exports from the southeastern DRC would likely shift more leverage to Chinese refiners that can certify and segregate radionuclide-bearing feedstock at scale.
The estimate that undeclared uranium in DRC cobalt exports could theoretically fuel a standard light‑water reactor for 10–25 years will sharpen scrutiny from the International Atomic Energy Agency on mixed critical‑minerals shipments, not just on traditional yellowcake exports.
Our database shows only a handful of uranium‑tagged safety pieces compared with broader cobalt coverage, so this incident in the Copperbelt is likely to become a reference case for how environmental and radiological risk is handled in critical‑minerals supply chains feeding US and Chinese technology sectors.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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