No public lands within the national conservation area shall be transferred out of Federal ownership except by exchange pursuant to section 206 of the Federal Land Policy and Management Act [
43 U.S.C.
1716]. Where consistent with the land use plans for the area, mineral development may be permitted pursuant to the Mineral Leasing Act of 1920, as amended, and supplemented (
30 U.S.C. 181–287) or the Materials Act of 1947, as amended (
30 U.S.C. 601–603). Subject to valid existing rights, the minerals in Federal lands within national conservation areas are hereby withdrawn from location, entry, and patent under the United States mining laws (
30 U.S.C. 22–54). Where consistent with the land use plan for the area, the Secretary may classify lands within national conservation areas as suitable for locatable mineral exploration and development and open such lands to entry, location, and patent under the United States mining laws (
30 U.S.C. 22–54).