Well, you did say guestimate so I'll take a stab.
Of course there are some important assumptions other than actually having 100m lbs. The grade of the material and also the price of uranium would have to match that of the Hathor sale and there would be other factors such as world demand and future projections at the time of sale.
So, my guestimate.
58m lbs (Hathor) x 1.73 = 100m lbs (FCU estimate).
So, $654m (sale price for 58m lbs) X 1.73 (increase in size) = $1.13 billion
Then, $1.13billion divided by 366,000 (approx. outstanding shares fully diluted) = $3.08 per share.
Remember, just thoughts here from a rookie.........