The exact timing and scale differed.

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They would all have the exact same design, allowing for easier licensing and deployment than large-scale facilities.

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He said the next stage was to confirm its exact identity using mass spectrometry and nuclear magnetic resonance analyses to produce it chemically on a larger scale.

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The exact value of these resources is impossible to calculate reliably, but a leading UN official described the scale of mineral deposits in the world's oceans as "staggering" with "several hundred years' worth of cobalt and nickel".

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