The Oyu Tolgoi mine, also Oyuutolgoi (Mongolian: Оюутолгой, pronounced [ɔˌjʊˑtʰɔɮˈɢœˑ]; lit. "Turquoise Hill"), is a combined open pit and underground mining project in Khanbogd sum within the south Gobi Desert, approximately 235 kilometres (146 mi) east of the Ömnögovi Province capital Dalanzadgad. The site was discovered in 2001 and is being developed as a joint venture between Turquoise Hill Resources (a majority owned subsidiary of Rio Tinto) with 66% ownership and the Government of Mongolia with 34%. The mine began construction as of 2010 and shipped its first batch of copper on 9 July 2013. The Oyu Tolgoi mining project is the largest financial undertaking in Mongolia's history and is expected upon completion to produce 450,000 tonnes (500,000 short tons) of copper annually. Financing for the project has come in part from the Rio Tinto Group and an investment agreement between Ivanhoe Mines and the government of Mongolia. Rio Tinto reached an agreement with the government in January 2022 to move the joint Oyu Tolgoi copper and gold project forward and resolve outstanding issues, which is key for Mongolia to significantly increase its copper exports to China in 2023. From Wikipedia
