A new mine in south India could contain the largest reserves of uranium in the world, a government official said in remarks reported Tuesday, signalling a major boost for the energy-hungry nation.

The Tumalapalli mine in Andhra Pradesh state could provide up to 150,000 tonnes of uranium, Srikumar Banerjee, secretary of the Department of Atomic Energy, told reporters after a four-year survey of the site was completed.

"It's confirmed that the mine has 49,000 tonnes of ore, and there are indications that the total quantity could be three times that amount," Banerjee was quoted as saying in The Times of India.

"If that be the case, it will become the largest uranium mine in the world," he said.

Previous estimates suggested that only about 15,000 tonnes of uranium would be produced at the mine, which is due to start operating by the end of the year.

S.K. Malhotra, spokesman for the Department of Atomic Energy, told AFP that experts at the Tumalapalli mine were "quite hopeful" that the eventual volume from the mine would reach 150,000 tonnes.

But he warned that "it is not high-grade uranium, it is low-grade uranium. We have not found any high-grade uranium in India to match that found in Australia."

Major exporter Australia has so far rebuffed Indian requests for supplies of the heavy metal, which is refined into nuclear fuel, because the country has not signed the Nuclear Non-Proliferation Treaty.

The government has been seeking new supplies of uranium worldwide and has concluded supply deals with France, Kazakhstan and Russia among others.

"The new findings would only augment the indigenous supply of uranium. There would still be a significant gap. We would still have to import," Banerjee was quoted as saying by The Hindu newspaper.

India's fast-growing economy is heavily dependent on coal, getting less than three percent of its energy from atomic power. It hopes to raise the figure to 25 percent by 2050.

"This find is significant as India expands its nuclear programme," Robert Vance, an analyst from the Paris-based Nuclear Energy Agency, told AFP. "It could more than double the total uranium deposits in the entire country."

But he questioned claims that Tumalapalli may become the world's largest uranium mine, pointing to the Olympic Dam site in Australia and the McArthur River deposit in Canada.

India currently has 20 nuclear reactors generating 4,780 megawatts of power, plus seven reactors with a capacity of 5,300 megawatts under construction.

Building began on Monday at two new indigenously-designed 700-megawatt nuclear plants in the western state of Rajasthan.

New Delhi -- backed by the US -- won a special exemption in 2008 from the Nuclear Suppliers Group (NSG), which governs global nuclear trade, to allow it to buy reactors and fuel from overseas.

India had been subject to an embargo since 1974 when it first conducted a nuclear weapons test.

Countries are normally required to have signed the nuclear non-proliferation treaty and open their reactors to international scrutiny before they can buy atomic technology and uranium.

With foreign companies now competing to sell reactors to India, US Secretary of State Hillary Clinton on a visit to Delhi on Tuesday said the two countries "can and must do more" to agree lucrative nuclear energy deals.

Since Japan's Fukushima crisis in March, environmentalists have campaigned to stop construction of new nuclear plants in India but the government has vowed to press ahead with its plans.

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