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This squares nicely with my understanding of what "reserves" are when talking about extractive resources.

Namely, the known quantity of a resource that can be extracted in an economical viable manner using current technologies.

So there are a number of variables that can affect the size of a reserve that have nothing to do with how much of the resource is known to exist.




The helium reserve they're talking about is an actual facility that stores helium. https://en.wikipedia.org/wiki/National_Helium_Reserve




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