Ivanhoe Mines Ltd. (IVN) unveiled an updated development plan for the big Oyu Tolgoi project in Mongolia that could boost copper production by 50% and gold output by 126%.

Oyu Tolgoi, the world's largest undeveloped copper-gold project, recently got the go-ahead from the Mongolian government when a 50-year investment agreement was finalized. The government holds a 34% stake in the project, with Vancouver-based Ivanhoe owning the remaining 66% stake.

Anglo-Australian miner Rio Tinto PLC owns a 22.4% stake in Ivanhoe and has the right to increase its stake to 46.6%.

Based only on proven and probable reserves, Ivanhoe said it now expects average annual production of 1.2 billion pounds of copper and 650,000 ounces of gold from Oyu Tolgoi for the first 10 years of production. It repeated that the mine is expected to begin production in 2013.

The study released Tuesday was prepared by engineering, mining and environment consultants led by AMEC Minproc of Australia and including Stantec Engineering of the U.S.

As well, the study includes a so-called life-of-mine sensitivity case that boosts estimated copper production by 50%, to 52.5 billion pounds, and gold production by 126%, to 26.4 million ounces. It stressed that this sensitivity case is based on inferred resources, which are "considered too speculative geologically to have the economic considerations applied to them that would allow them to be categorized as mineral reserves."

Part of the current exploration program is aimed at upgrading the inferred resources to higher classifications.

Nevertheless, Ivanhoe said it believes the 59-year mine life projected by the life-of-mine sensitivity case "will prove to be very conservative."

Neighboring China has a huge appetite for copper, as evidenced by the recent C$679 million bid by two Chinese companies for Corriente Resources Inc. (ETQ).

Ivanhoe Chairman Robert Friedland recently said the company was looking at a number of alternatives to enhance shareholder value. It has hired Citigroup Inc. (C) and Hatch Corporate Finance to explore financing options.

-By John Moritsugu, Dow Jones Newswires; 416-306-2100; john.moritsugu@dowjones.com

 
 
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