Democratic Republic of Congo’s State mining company Gecamines has submitted an offer to buy Freeport McMoRan’s majority stake in the Tenke copper project, Gecamines’ interim director-general Jacques Kamenga told Reuters on Wednesday. Freeport agreed in May to sell its 56% stake in Tenke, one of the world’s largest copper mines, to China Molybdenum for $2.65-billion.