oyu production tolgoi
Turquoise Hill Resources - Oyu Tolgoi (copper-gold), Mongolia .The comprehensive Oyu Tolgoi Investment Agreement took effect March 31, 2010, . Oyu Tolgoi has been producing and exporting copper and gold concentrate.oyu production tolgoi,Oyu Tolgoi LLCOyu Tolgoi is a copper-gold mine in the South Gobi region of Mongolia, . only in February 2015, just over 18 months after entering commercial production. Oyu.