Anglo-Australian miner Rio Tinto PLC (RTP) said Wednesday that the investment agreement for the $4 billion Mongolian Oyu Tolgoi copper-gold mine has become binding and the project will now move into its development phase.

Under the investment agreement, the Mongolian government will own 34% of OT LLC, the license holder of the Oyu Tolgoi project. The project is being developed by the mine's owner, Canada-based miner Ivanhoe Mines Ltd (IVN.T) and Rio Tinto, which holds a 22.4% stake in Ivanhoe and will help develop the project.

The investment agreement marks an important milestone for the development of the project and for mining investment in the country, which has some of the world's largest untapped reserves of coal, copper and other commodities.

Like other mineral-rich but underdeveloped countries, Mongolia has struggled to attract major investment during the recent global commodity boom because of an uncertain regulatory environment and efforts to secure mining profits. The investment agreement includes key terms regarding a stable operational and tax environment, provisions dealing with the Government's equity participation and financing arrangements.

A clear framework for taxation and government involvement for Oyu Tolgoi is expected to pave the way for billions of dollars of future investment.

Rio Tinto said the cost to build and commission the mining complex is expected to be about $4 billion, though the final projections are yet to be confirmed. A decision to build a coal-fired power plant for Oyu Tolgoi would require an additional capital commitment, the miner said.

The mine, located in the South Gobi Desert just north of the Chinese-Mongolian border, is expected to produce 450,000 metric tons of copper, about 3% of global supply, and 330,000 troy ounces of gold, with a mine life of 45 years. Production is expected to start in 2013 and take five years to reach full output.

Company Web Site: http://www.riotinto.com

-By Alex MacDonald, Dow Jones Newswires; +44 (0)20 7842 9328; alex.macdonald@dowjones.com (Jeffrey Sparshott and Elisabeth Behrmann contributed to this article)

 
 
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