Democratic Republic of Congo plans to expand its main border post with Zambia, a source close to its government said, to ease truck queues of up to 60 km that copper miners have faced this year due to increased production and inadequate infrastructure. The backlog of trucks at Kasumbalesa, a border town and the main exit point for metals exports from Congo, is an example of supply chain disruption that will make it harder to meet future demand for copper, essential for electric vehicles.