rio
Rio, which meets its London-based investors on April 19, has been in the spotlight over rising costs at Oyu Tolgoi, the flagship Mongolian copper-gold mine that it controls through its majority stake in Ivanhoe Mines.
A 513-page technical report -- published two weeks ago by Ivanhoe but not publicised or officially endorsed by Rio -- put the capital costs for one of the industry's most anticipated greenfield projects at $13.2 billion US, up from $9.55 billion.