Rio Writes Down $4.7 Billion of Unit Operating Mongolia Mine - Bloomberg: "London-based Rio, the world’s second-biggest mining company by value, and Mongolia have been at loggerheads over the mine’s cost overruns and the long-term financing of Oyu Tolgoi, being developed by unit Turquoise Hill Resources Ltd. (TRQ) The construction of the underground section was suspended in August. Mongolia holds 34 percent of the Oyu Tolgoi mine, with Rio-controlled Turquoise Hill owning the remaining stake."
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