Rio Tinto, a metals and mining corporation, completed the acquisition of the remaining 49% stake in Turquoise Hill, a mineral exploration and development company, for $3.1bn. "This acquisition further strengthens our copper portfolio, as part of our strategy to grow in materials the world needs for achieving net zero and delivering long-term value for our shareholders. We now have a simpler and more efficient ownership and governance structure, with our partner the Government of Mongolia, as we proceed together towards sustainable production from the underground mine,” Bold Baatar, Rio Tinto Copper CEO.