RPT-REFILE-Rio CEO to visit troubled Mongolia copper mine - sources
March 26, 2015 at 18:19 PM EDT
ULAN BATOR, March 26 (Reuters) - Rio Tinto's chief executive will visit its $6.5 billion Oyu Tolgoi copper mine in Mongolia on Sunday, two people familiar with the visit said, amid signs the country's new prime minister is keen to end disputes that have delayed an expansion project.