Rio Tinto (ASX:RIO,NYSE:RIO,LSE:RIO) has finalized a joint venture with Angolan state-owned diamond company Endiama EP to develop the Chiri mine, advancing a project expected to become the country’s third-largest gem producer. The new entity, Sociedade Mineira do Chiri, formalizes Rio Tinto’s operational control over the asset. The London-based miner will hold a 75 percent operating stake in the venture, with the Angolan state retaining the rema…
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