From century-old maps to meticulous field notes, Belgium is sitting on a trove of geological records on colonial-era Congo, a coveted archive it is working to open up amid a global scramble for critical minerals.
Teeming documents charting the rich subsoil of what is now the Democratic Republic of Congo fill nearly 500 metres of shelving at the AfricaMuseum in Tervuren, outside the Belgian capital.
The museum has pledged to digitise the contents and make them public within five years and, as the race for so-called rare earths heats up, it has grappled with how far to share the data with the mining sector.
Last year, the institution - formerly the Royal Museum for Central Africa - turned down an offer from the US company KoBold Metals to handle the archive's digitisation.
Belgian officials said they could not give exclusive access to millions of documents about the Congo’s geology to an overseas private company.
