Any prospecting permit issued under this subchapter may be extended by the Secretary of the Interior for a period not exceeding two years, upon a showing of satisfactory cause. (Feb. 7, 1927, ch. 66, § 7, as added May 7, 1932, ch. 174, 47 Stat. 151 .) Editorial Notes Codification Section was not enacted as part of act Feb. 25, 1920, ch. 85, 41 Stat. 437 , known as the Mineral Leasing Act , which comprises this chapter. CFR Title Parts 43 17 , 3040