Ocean Floor Gold

There is gold buried in our ocean beds, deposited by submarine volcanos. “The grade of the gold is spectacular,” says Cornel de Ronde, the Institute of Geological and Nuclear Science (GNS) principal scientist who leads the Offshore Minerals part of the Economic Growth for New Zealand through Mineral Wealth programme. “But the tonnage has yet to be determined.”

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It can be filtered from sea water too - If you have a desaltination plant, you get a few extra minerals extracted as pocket money.