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Rio flags Oyu Tolgoi cost blowout, delays

Oyu Tolgoi underground to cost more and take longer to reach first production

Kristie Batten
Underground at Oyu Tolgoi in Mongolia

Underground at Oyu Tolgoi in Mongolia

The company said in February challenging ground conditions required some "potentially significant" changes to the design and schedule of the $5.3 billion development. Rio said work completed since then...

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