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About LinkBackshttps://pubs.usgs.gov/periodicals/mc...are-earths.pdf
A little more up to date.
I know that there is one Mine in Canada near to production. And that there are more planned.
https://pubs.usgs.gov/periodicals/mc...are-earths.pdf
A little more up to date.
I know that there is one Mine in Canada near to production. And that there are more planned.
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