The Gorgon liquefied natural gas project in Western Australia state will come with a A$43 billion price tag operator Chevron Corp. (CVX) said Monday after its partners signed off on the development as expected.

The project's 50%-owner, Chevron said initial works will begin immediately and that it and its partners, Exxon Mobil Corp. (XOM) and Royal Dutch Shell PLC (RDSB.LN), with a 25% holding each, are still aiming to ship first gas by 2014.

If completed to plan, Gorgon will provide a key source of fuel to fast-growing Asian economies nearby and reinforce Australia's status as a significant global energy producer.

Chevron reiterated that it will fund its share of the project's construction from its own balance sheet.

The final corporate approval of Gorgon, designed to ship 15 million metric tons of LNG a year from three production units, follows hot on the heels of it obtaining final regulatory approvals from the Australian government this month and last.

George Kirkland, Chevron's global executive vice president for upstream and gas, said Gorgon could grow by another two processing trains pending government and partner approval.

The company will have "a lot more information about the next set of trains" in another year, Kirkland told reporters.

He said that the third processing train at Gorgon will come online at least one year to one-and-a-half years after the first train.

"So we've got a little bit of time here (on trains four and five)," Kirkland said, adding Chevron will be completing gas reservoir studies in the meantime.

To get government approval for the initial phase of the project, Chevron had to meet strict environmental conditions, including providing safeguards for a rare species of carnivorous turtle that populates the nature reserve of Barrow Island, where the LNG processing terminal will be constructed.

Industry sources were expecting Chevron, Exxon Mobil and Shell to make their final investment decision Monday.

One of the world's largest natural gas projects, Gorgon will be an "important pillar" of the Australian economy for the next 40 years, Chevron Australia Managing Director Roy Krzywosinski said in a statement.

"We anticipate A$33 billion will be spent on Australian goods and services with flow-on effects cascading through the Western Australian economy," he said.

Krzywosinski later told reporters that the project partners expect to award A$10 billion of construction contracts in coming weeks and months in addition to the A$2 billion worth already awarded.

The Australian government said the project is expected to generate A$300 billion in export earnings and A$40 billion in government revenue.

Named after the nearby Gorgon gas field discovered about 30 years ago, the project will tap into 40 trillion cubic feet of gas, the equivalent of 6.7 billion barrels of oil.

It is considered one of the frontrunners of close to a dozen LNG projects planned for construction in Australian and Papua New Guinea, partly because it's the only one so far to have made a final investment decision, and partly because it has underwritten its construction with binding offtake contracts.

Chevron last week said it signed three binding sales agreements to supply nearly three million metric tons a year of LNG from Gorgon to Japanese and South Korean energy companies.

Subject to Australian foreign investment approval, the Japanese companies, Osaka Gas and Tokyo Gas, will also acquire 1.25% and 1% interests in the project respectively.

Exxon Mobil last month struck two deals over Gorgon LNG, including a 20-year deal with PetroChina Co., the listed unit of China National Petroleum Corp., and a 20-year agreement with Petronet LNG Ltd., India's largest LNG importer.

Shell last year agreed to sell LNG from its share of Gorgon to PetroChina. "Shell's access to LNG import terminals around the world provides further options for Gorgan gas," Shell said in a statement Monday.

-By Ross Kelly, Dow Jones Newswires; 61-2-8235-2957; ross.kelly@dowjones.com