Competition for Emgold, from the Ocean

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Mr Kato estimated that rare earths contained in the deposits amounted to 80 to 100 billion tonnes.

The US Geological Survey has estimated that global reserves are just 110 million tonnes, found mainly in China, Russia and other former Soviet countries, and the United States.

China's apparent monopoly of rare earth production enabled it to restrain supply last year during a territorial dispute with Japan.

Japan has since sought new sources of the rare earth minerals.

The Malaysian government is considering whether to allow the construction of an Australian-financed project to mine rare earths, in the face of local opposition focused on the fear of radioactive waste.

The number of firms seeking licences to dig through the Pacific Ocean floor is growing rapidly.

The listed mining company Nautilus has the first licence to mine the floor of the Bismarck and Solomon oceans around Papua New Guinea.

It will be recovering what is called seafloor massive sulphide, for its copper and gold content.

The prospect of deep sea mining for precious metals - and the damage that could do to marine ecosystems - is worrying environmentalists.