Rio Tinto goes ahead with $5.3 billion expansion of Oyu Tolgoi

[caption id="attachment_851366" align="alignright" width="550"] Oyu Tolgoi, a copper-gold mine in the South Gobi region of Mongolia, approximately 550 km south of the capital Ulaanbaatar, holds one of the largest undeveloped high-grade copper deposits in the world. (Image courtesy of Oyu...