U SupplySupply of Uranium (Updated 8 October 2014) •Uranium is a relatively common metal, found in rocks and seawater. Economic concentrations of it are not uncommon. •Its availability to supply world energy needs is great both geologically and because of the technology for its use. •Quantities of mineral resources are greater than commonly perceived. •The world's known uranium resources increased by at least one-quarter in the last decade due to increased mineral exploration. Uranium is a relatively common element in the crust of the Earth (very much more than in the mantle). It is a metal approximately as common as tin or zinc, and it is a constituent of most rocks and even of the sea. Some typical concentrations are: (ppm = parts per million). Very high-grade ore (Canada) – 20% U 200,000 ppm U High-grade ore – 2% U, 20,000 ppm U Low-grade ore – 0.1% U, 1,000 ppm U Very low-grade ore* (Namibia) – 0.01% U 100 ppm U Granite 3-5 ppm U Sedimentary rock 2-3 ppm U Earth's continental crust (av) 2.8 ppm U Seawater 0.003 ppm U * Where uranium is at low levels in rock or sands (certainly less than 1000 ppm) it needs to be in a form which is easily separated for those concentrations to be called 'ore' – that is, implying that the uranium can be recovered economically. This means that it needs to be in a mineral form that can easily be dissolved by sulfuric acid or sodium carbonate leaching. An orebody is, by definition, an occurrence of mineralisation from which the metal is economically recoverable. It is therefore relative to both costs of extraction and market prices. At present neither the oceans nor any granites are orebodies, but conceivably either could become so if prices were to rise sufficiently. Measured resources of uranium, the amount known to be economically recoverable from orebodies, are thus also relative to costs and prices. They are also dependent on the intensity of past exploration effort, and are basically a statement about what is known rather than what is there in the Earth's crust – epistemology rather than geology. See Appendix 2 for mineral resource and reserve categories. Changes in costs or prices, or further exploration, may alter measured resource figures markedly. At ten times the current price*, seawater might become a potential source of vast amounts of uranium. Thus, any predictions of the future availability of any mineral, including uranium, which are based on current cost and price data and current geological knowledge are likely to be extremely conservative. * US DOE-funded work using polymer absorbent strips suggest $610/kgU in 2014. From time to time concerns are raised that the known resources might be insufficient when judged as a multiple of present rate of use. But this is the Limits to Growth fallacy, a major intellectual blunder recycled from the 1970s, which takes no account of the very limited nature of the knowledge we have at any time of what is actually in the Earth's crust. Our knowledge of geology is such that we can be confident that identified resources of metal minerals are a small fraction of what is there. Factors affecting the supply of resources are discussed further and illustrated in the Appendix. Uranium availability With those major qualifications the following Table gives some idea of our present knowledge of uranium resources. It can be seen that Australia has a substantial part (about 29 percent) of the world's uranium, Kazakhstan 12 percent, Russia nine percent and Canada eight percent. Known Recoverable Resources of Uranium 2013 tonnes U percentage of world Australia 1,706,100 29% Kazakhstan 679,300 12% Russian Fed 505,900 9% Canada 493,900 8% Niger 404,900 7% Namibia 382,800 6% South Africa 338,100 6% Brazil 276,100 5% USA 207,400 4% China 199,100 4% Mongolia 141,500 2% Ukraine 117,700 2% Uzbekistan 91,300 2% Botswana 68,800 1% Tanzania 58,500 1% Jordan 33,800 1% Other 191,500 3% World total 5,902,500 Reasonably Assured Resources plus Inferred Resources, to US$ 130/kg U, 1/1/13, from OECD NEA & IAEA, Uranium 2014: Resources, Production and Demand ("Red Book"). The total to US$ 260/kg U is 7.635 million tonnes U, and Namibia moves up ahead of Niger and USA ranks just after Canada.