; or (B) the Forest and Rangeland Renewable Resources Planning Act of 1974 ( 16 U.S.C. 1600 et seq. ). (6) Areas without approved comprehensive land use plan For land covered by a prospecting license for which a comprehensive land use plan treating hardrock mining as a multiple-use activity has not been completed, the Secretary concerned shall ensure that such land is suitable for mineral activities. (7) Extension The Secretary may extend a prospecting license granted under this subsection for not more than additional 4 years upon a showing by the licensee that— (A) the licensee explored with reasonable diligence and was unable to determine the existence and workability of a valuable mineral deposit covered by the license