Useful background from @setfire2thehive :
The main difference I suppose between ionic clays and hard rock, is that a high grade ppm of U and Th (which are at elevated levels in the feedstock) means that post processing the tailings are at that same high grade.
https://inis.iaea.org/collection/NCLCollectionStore/_Public/49/034/49034222.pdf
Also worth noting that not all uranium is the same and essentially the more aggressive you process it, the more radioactive it can become. This is why hardrock projects have a greater issue with radionuclides irrespective of the physical quantity bein processed.
https://www.epa.gov/radiation/radionuclide-basics-uranium
You essentially have 2 options; dilute it down to lower levels and/or it's stored in a closed loop system.
https://hotcopper.com.au/posts/56206199/single
