UNDERGROUND

Oyu Tolgoi progressing well, Rio says

Shaft No.2 in final commissioning phase

 Underground at Oyu Tolgoi in Mongolia

Underground at Oyu Tolgoi in Mongolia

In July, the company warned of a cost blowout of as much as US$1.9 billion on the $5.3 billion capital costs after challenging ground conditions required major changes to mine design and a delay of 16-30...

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