Jersey-registered GTL joint venture in the historical Lubumbashi Big Hill cobalt-alloy chain. The DRC processing company STL is a separate legal person.
Sources support the description and the individual connections below. Publication and checking dates belong to the evidence: when it was published, and when this Hub last read it.
Reported means the cited source describes the relationship at its evidence date. Historical relationships refer to an earlier period. Announced agreements may not have been implemented. None of these labels confirms that trade continues today.
USGS reports that GTL Big Hill cobalt alloy was refined at Freeport Cobalt in Finland and records a two-year supply agreement; GTL is not conflated with later STL.
The 2013 DRC extractive-industry report identifies Groupement pour le Traitement du Terril de Lubumbashi (GTL) and its alloy output.
GTL alloy from Big Hill was refined at Freeport Cobalt; CMSK reportedly sold cobalt concentrate to Freeport Cobalt.