Here is a good You Tube clip on the massive Oyu Tolgoi, OT (Turquoise Hill) copper mine.  The mine is located in the Gobi Desert in Mongolia.  The costs to bring the mine online are estimated at $6.5 billion.  OT will start production in 2012.  The mine will have a huge impact on the economy of Mongolia.  Over several years this one mine will double the GDP of Mongolia.

http://www.youtube.com/watch?v=UoY5cVIdVMU