33 U.S.C. § 675
No permission granted to a mine owner or owners under this chapter shall take effect, so far as regards the working of a mine, until all impounding dams or other restraining works, if any are prescribed by the order granting such permission, have been completed and until the impounding dams or other restraining works or settling reservoirs provided by said commission have reached such a stage as, in the opinion of said commission, it is safe to use the same: Provided, however, That if said commission shall be of the opinion that the restraining and other works already constructed at the mine or mines shall be sufficient to protect the navigable rivers of said systems and the work of said commission, then the owner or owners of such mine or mines may be permitted to commence operations.
33 U.S.C. § 675
STATUTORY NOTES AND RELATED SUBSIDIARIES
TRANSFER OF FUNCTIONS California Debris Commission abolished and functions transferred to Secretary of the Army by Pub. L. 99-662, title XI, §1106, Nov. 17, 1986, 100 Stat. 4229, set out as a note under section 661 of this title.