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Radioactive decay to lead stable isotopes.
On the basis of December 2012 data Australia has 29% of the world's uranium resources – 1.7 million tonnes of uranium.
Uranium 235 is approx. 0,7 % from the natural uranium; see the link below for the uranium supplies.
Francium exists in uranium and thorium ores.
Uranium mostly exists as a mineralPitch blend in mountainous rocks it is extracted in any country under the strict supervision of government.
The world production of uranium is approx. 55 000 t each year.But the the production is variable from an year to another.
Approx. 90 % in 2010.
500.000
Approx. 5 % of the world reserves.
Around the world approx. 55 000 t uranium are yearly produced.If you want a mean this is 150 t/day.
Uranium is formed in the world by stellar nucleosynyhesis.
uranium and plutonium are much more costly minerals.