ABSTRACT In situ leaching of uranium has rapidly developed into a commercial technology. The extent of this development is typified by the fact that many mining feasibility studies now routinely examine in situ leaching as well as the conventional shaft and open pit options. A methodology for evaluating the leachability of a uranium ore body is presented. Extensive coring of the ore body and testing of ore samples are necessary to establish the quality, quantity, and leachability of the ore. A testing program which provides the necessary data in a rapid, yet thorough fashion, is discussed.