All mining operations (location of mining claims, prospecting, and mining, including panning, sluicing, and dredging) under the 1872 Mining Law are prohibited within withdrawn areas of the Angeles National Forest. Public Law No. 578 (1928 withdrawal) withdrew areas from entry and location under the mining laws. There is no provision in PL 578 which provides for even a limited right to enter the withdrawn lands to prospect. Therefore, National Forest System lands within the East Fork of the San Gabriel River are not open to prospecting or any other mining operations.