Turquoise Hill Resources is a Canadian mining company primarily focused on the development of mineral resources in Mongolia. The company is best known for its ownership stake in the Oyu Tolgoi copper-gold mine, one of the largest mining projects in the world. Founded in 1994, Turquoise Hill operates as a subsidiary of Rio Tinto, a major global mining group. The company aims to create value through the sustainable extraction of minerals while adhering to environmental and social responsibility standards.