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The amount of ultimately recoverable uranium depends very strongly on what you're willing to pay for it; it's a widely distributed metal with very large low-grade deposits that aren't currently considered profitable(see Deffeys and McGreggor "World Uranium resources" for estimates of uranium resources in low ore-grades).
As yellowcake is a very small part of amortized cost per kWh for a nuclear power plant even with current LWRs which use only ~1% of the energy available in natural uranium there's no reason to believe 4.7 million tonnes(current red book estimate for 130 USD/kg) is the limit. How much we actually extract is going to depend very strongly on the cost of competing sources of energy(e.g. molten thorium flouride reactors, fusion, renewables and the storage technologies required for replacement of baseload) and the cost of reactors that more effectively use natural uranium(e.g. high temperature gas cooled reactors capable of higher burn-up or fast breeders).
The table with the figures from the World Nuclear Association said that Pakistan has 112,000 tonnes of uranium, 2.1% of the world reserves. However, the WNA site shows Jordan in that place and with these figures, not Pakistan (Pakistan does not appear in the WNA list at all). I corrected the mistake and replaced Pakistan with Jordan. --Godagast (talk) 04:42, 2 March 2011 (UTC)
I gave the list a total overhaul, based on the Uranium 2009 report by the NEA / IAEA. It is now much more comprehensive. I have added historical production figures up to 2008 as well, and totals of historical production plus reserves. (Godagast (talk) 09:09, 7 April 2011 (UTC))