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Neon is not mined. It is (like all the nobel gasses except helium and radon) extracted from air by cryogenic fractional liquefaction.

Helium is too light to accumulate in the atmosphere, it is separated from natural gas in certain gas fields where salt domes capture the gasses and there are uranium deposits nearby (alpha particles from uranium decay are helium nuclei). Example Texas oil & gas fields.

Radon can be collected as a gas emitted from uranium ores, but its longest halflife of 23 minutes makes it rather useless.

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14y ago

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