, 11 A maximum depth of 2 km was preferred to Drew's value (1 km

, as some uranium mines are known at those depths. 12 This choice was guided by the Red Book [5] reference values (70 to 75% for underground and ISL methods which are the most common in the United States, and 75% when no method is specified)

, there is no declaration of US Prognosticated and Speculative resources (PR & SR)

, The US does not report inferred resources (IR)

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