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 shall be construed to impair in any way, rights or interests in mining property acquired under laws in force prior to ; 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 .section 661 of title 43July 9, 18701870-07-09July 25, 18661866-07-25