Oyu Tolgoi is a large copper and gold mining project located in the southern region of Mongolia. It is one of the largest known copper deposits in the world and is operated by Turquoise Hill Resources, a subsidiary of Rio Tinto. The project includes an underground mine and an open-pit mine, contributing significantly to the local economy and providing jobs. The site is rich in minerals, with estimated reserves of over 40 billion pounds of copper and 22 million ounces of gold. Oyu Tolgoi plays a crucial role in Mongolia's mining sector, attracting foreign investment and supporting infrastructure development in the region.