Uranium 2020: Resources, Production and Demand Table 1.2a. Identified resources (recoverable)(as of 1 January 2019, tonnes U, rounded to nearest 100 tonnes).* Secretariat estimate. (a) Not reported in 2019 responses, data from previous Red Book. (b) Assessment partially made within the last five years.(c) Assessment not made within the last five years. (d) In situ resources were adjusted by the Secretariat to estimate recoverable resources using recovery  factors provided  by  countries or  estimated  by  the  Secretariat. (e) Cost data not provided, therefore  resources are  reported  in the <USD 260/kgU category. (f) Updated to report recoverable resources.(g) Totals related to cost ranges <USD 40/kgU and <USD 80/kgU should be regarded with some caution since certain countries do not report low-cost resource estimates, mainly for confidentiality concerns, whereas othercountries that have never, or not recently hosted uranium mining, may be underestimating mining costs.