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% their own use, free of cost, from any public lands, within such limits aa the Secretary of the Interior may determine, stone, earth, gravel, sand, and other materials of like character necessary or useful in the construction, operation, and maintenance of aqueducts, reservoirs, dasifc, 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 regulations to be prescribed by the Secretary of the Interior. Each of these grants shall be effective upon (l) the filing by the 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 ol said lands and of said rights of way for the purposes hereinabove set forth; (2) the approval of such map or maps by the Secretary of the Interior with sueh reservations or modifications as he may deem appropriate; (3) the payment of $1.25 per acre for t/ 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, aa 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 2.