4. Uranium resources worldwide

4.1 Defining the different resource categories

Resource estimates are divided into distinct categories corresponding to different degrees of certainty of the quantities considered.

Resources reasonably assured (RRA), i.e. recoverable at a given cost, are found in known ore deposits whose volume, grade and configuration have been determined. Within these RARs, the quantities recoverable at different costs are determined.

Estimated Additional Resources (EAR) are less reliable estimates, as they are not the result of measurements but of presumptions based on geological data. They are not taken into account here.