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Rio heralds Argyle underground

DESPITE a cooling interest in diamonds, Rio Tinto has celebrated the $US2.2 billion ($A2.1 billion) Argyle underground mine in Western Australia’s Kimberley region.

Kristie Batten
Rio heralds Argyle underground

The transition from open pit to underground ensures the life of the mine until at least 2020. Average annual production from the underground is expected to be 20 million carats. Rio said the mine...

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