There is hereby established in the Department of the Interior a bureau of mining, metallurgy, and mineral technology, to be designated the United States Bureau of Mines, and there shall be a director of said bureau, who shall be thoroughly equipped for the duties of said office by technical education and experience and who shall be appointed by the President, by and with the advice and consent of the Senate; and there shall also be in the said bureau such experts and other employees, to be appointed by the Secretary of the Interior, as may be required to carry out the purposes of sections 1, 3, and 5 to 7 of this title in accordance with the appropriations made from time to time by Congress for such purposes.