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In page Uranium:

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The ultimate available supply is believed to be sufficient for at least the next 85 years,[8] though some studies indicate underinvestment in the late twentieth century may produce supply problems in the 21st century.[9] Uranium deposits seem to be log-normal distributed. There is a 300-fold increase in the amount of uranium recoverable for each tenfold decrease in ore grade.[10] In other words, there is little high grade ore and proportionately much more low grade ore available.[citation needed]