Rio Tinto to spend at least $500 million to advance diamond project in India

[caption id="attachment_814156" align="aligncenter" width="600"] Bunder diamond jewellery collection.  (Image courtesy of Rio Tinto Diamonds)[/caption] Mining giant Rio Tinto (LON:RIO) plans to invest $500 million in its Bunder diamond mining project in the central Indian state of Madhya Pradesh, the firm boss...

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