Based on the tonnages for cryolite, quartz, fluorite, my...

Based on the tonnages for cryolite, quartz, fluorite, my personal calculation is a very MINIMUM of US$ low billion up to double digits billions.
Where are these tens of billions of dollar calculations?. Id love to see how you determined this figure to ensure them substantiated. As of course they do sound ridiculously high for a mine that got sold for the tiniest fraction of that and absent major information required to evaluate it.

ready to mine as well as high potential of REE in Greenland
You mean Euporium right? Thats the only one REE potential and at 423ppm this has added to the tens of billions potential figure you calculated. Thats unusual when Lynas only has 2-3 billion market cap including their 1 billion infrastructure of course.