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materials of like character necessary or useful in the con­struction, operation, and maintenance of aqueducts, reservoirs, dams, pumping plants, electric transmission, telephone, and telegraph lines, roads, trails, bridges, tramways, railroads, and other means of locomotion, transmission, and communication. That there is hereby excepted and reserved unto the United States, from said grant, minerals, other than sand, stone, earth, gravel, and other materials of like character: Provided, however, That such minerals so excepted and reserved shall be prospected for, mined, and removed only In accordance with regulation® to be prescribed by the Secretary of the Interior. This grant shall be effective upon (1) the filing by said grantee at any time after the passage of this Act, with the manager of the United States local land office in the district where said lands are situated, of a map or maps show­ing the boundaries, locations and extent of said lands and of said rights of way for the purposes hereinabove set forth; (2) the approval of such map or reaps by the Secretary of the Interior with such reservations or modifications as he may deem appropriate; (3 ) the payment of $1.25 per acre for all government lands conveyed under this Act other than for rights of way: Provided that said lands for rights of way shall be along such location and of such width, not to exceed 250 feet, as in the Judgment of the Secretary of the Interior may be required for the purposes of this Act. Sec. 2, Whenever the lands or the rights of way are the same as are designated on any map heretofore filed by said Basic Management, Inc., or by any of its predecessors in 2 .