Rio Tinto under investigation by SEC over Mozambique impairment

LONDON—Mining company Rio Tinto PLC on Thursday said it was under investigation by the U.S. Securities Exchange Commission over an impairment it booked in 2012 against its operations in Mozambique.

Rio RIO, +1.65%RIO, -1.12% said it was cooperating with the SEC’s probe, which it said started in 2013, but that it would be “inappropriate to comment further at this time” because the investigation is ongoing.

The company was responding to media reports published earlier this week that the SEC was examining the timing of $3 billion of impairment charges it booked on a Mozambique coal deal.

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