30 USC 47 - Impairment of rights or interests in certain mining property

Nothing contained in sections 21, 22 to 24, 26 to 28, 29, 30, 33 to 48, 50 to 52, 71 to 76 of this title and section 661 of title 43 shall be construed to impair in any way, rights or interests in mining property acquired under laws in force prior to July 9, 1870; nor to affect the provisions of the act entitled An act granting to A. Sutro the right-of-way and other privileges to aid in the construction of a draining and exploring tunnel to the Comstock lode, in the State of Nevada, approved July 25, 1866.