Debswana Diamond Co will spend 65-billion pula (about R85bn) to build the world’s largest underground diamond mine at Botswana’s Jwaneng, which is already the richest mine by value for the previous stones.

The underground mine will have more than 360km of tunnel development and will hit full production by 2034, Debswana’s head of transformation and innovation, Thabo Balopi, said at a briefing in Gaborone on Friday...

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