The mine is Rio’s biggest copper growth project, but it has faced geological challenges and legal setbacks.

Mark Bristow met Papua New Guinea landowners on Thursday to discuss royalty arrangements, as the miner seeks to negotiate a reopening of the Porgera gold mine.

The world’s most influential gold market authority is threatening to stop bullion from countries including the United Arab Emirates entering the mainstream market if they fail to meet regulatory standards.

The company has raised its investment forecast to $3.3 billion for its Sukhoi Log gold deposit in Siberia.

Turquoise Hill last week began arbitration proceedings against its biggest shareholder Rio Tinto to seek "clarity" on financing for Oyu Tolgoi, one of Rio's biggest growth projects.