The Democratic Republic of Congo’s (DRC’s) State miner has started selling its share of copper from joint-venture projects for the first time as the country seeks greater control over a metal key to the energy transition. Gecamines holds minority stakes in large mines run by firms such as China’s CMOC Group and Glencore. Until now, the joint ventures themselves have sold all the production. But the State company is taking a more active role in marketing its portion — totaling hundreds of thousands of tons a year – according to people familiar with the matter.