By Elisabeth Behrmann and Jeffrey Sparshott 
   Of DOW JONES NEWSWIRES 
 
   (Adds comments from Rio Tinto, background.) 
 

Mongolia's parliament Tuesday took a significant step forward in paving the way for the development of the US$3 billion Oyu Tolgoi copper-gold mine, which is seen as a blueprint for billions of dollars worth of future mining investments in the country.

Parliament agreed to cancel a windfall profits tax on copper and gold, and amended three other laws that were a major hurdle for a final investment agreement for the project, miners Rio Tinto PLC (RTP) and Ivanhoe Mines Ltd. (IVN.T) said.

"This is an incredibly important milestone in bringing onstream one of the finest undeveloped copper-gold projects in the world," Rio Tinto Chief Executive Tom Albanese said in a statement.

Following the parliamentary greenlighting of the abolition of the windfall tax, Mongolia's finance minister said he expected the signing of a final investment agreement within the next two weeks.

A Rio Tinto spokesman said that once that agreement was in place, it will take about six months to conclude the Mongolian feasibility study for the mammoth project.

Talks on an investment agreement have dragged on since 2003, and hit a serious snag in 2006, when the country introduced a windfall tax that emerged as a key sticking point between the government and the miners.

But with the global financial crisis hitting investments in general and Mongolia in need of new investments, parliament renewed interest in getting the agreement off the ground.

Now, Mongolia's lawmakers have added a sunset provision to cancel the three-year-old tax on copper and gold effective Jan. 1, 2011, Ivanhoe said. The windfall provision imposes a 68% tax on copper sold above US$2,600 per metric ton and the gold price above US$500 per troy ounce on the London Metal Exchange.

"Now we are in a position to make arrangements with the government to sign the Oyu Tolgoi Investment Agreement in the near future," Ivanhoe President John Macken said in a statement.

Oyu Tolgoi is owned by Canada's Ivanhoe Mines. Anglo-Australian miner Rio Tinto holds a 9.95% stake in Ivanhoe after making an initial US$303 million investment in 2006.

Rio has agreed to invest another US$388 million for a further 9.95% at the conclusion of a long-term investment agreement, with an option to eventually increase the investment to US$2.3 billion for a 46.65% stake.

Ivanhoe will release an updated cost estimate and development plan in September-October, and will also have to raise money to meet its funding obligation for Oyu Tolgoi, a person familiar with the situation said.

Mongolia's government will have a 34% stake in the project.

The Oyu Tolgoi project is located in the South Gobi region just north of the Chinese-Mongolian border, and is expected to produce 440,000 tons of copper and 320,000 ounces of gold annually, with a 45-year mine life.

Mongolia, on the doorstep of commodity-hungry China, is rich in copper and gold, as well as containing significant coal and uranium deposits.

The Tavan Tolgoi coal mine has already received a number of expressions of interest from large international mining companies such as Vale S.A. (VALE) and Peabody Energy Corp. (BTU).

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

-By Jeffrey Sparshott and Elisabeth Behrmann, Dow Jones Newswires; +61 2 8272 4689; jeffrey.sparshott@dowjones.com