I emailed UUU with my question regarding the entry in the accounts for the "future income tax" entry and they replied within a couple of hours.
"this number is a book-keeping account that will change quarterly depending on the value of the Kazakh currency, the Tenge, in world markets. It is a non-cash item and will never have to be paid"
I was looking for a play on the price of uranium.
Nufcor appear too expensive with a 20% premium to assets, but UUU looks interesting now I've cleared up that entry.