Upon the recommendation of the Secretary of the Interior, with the approval of the President, after sixty days’ notice thereof, published in two papers of general circulation in the State or Territory wherein any national forest is situated, and near the said national forest, any public lands embraced within the limits of any such forest which, after due examination by personal inspection of a competent person appointed for that purpose by the Secretary of the Interior, shall be found better adapted for mining or for agricultural purposes than for forest usage, may be restored to the public domain. And any mineral lands in any national forest which have been or which may be shown to be such, and subject to entry under the existing mining laws of the United States and the rules and regulations applying thereto, shall continue to be subject to such location and entry, notwithstanding any provisions contained in sections 473 to 478, 479 to 482 and 551 of this title.