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33 U.S.C. 668: “Hydraulic mining” and “mining by hydraulic process” definedText contains those laws in effect through Public Law 119-120 (October 7, 2026).
From Title 33-NAVIGATION AND NAVIGABLE WATERSCHAPTER 14-CALIFORNIA DEBRIS COMMISSION
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§668. “Hydraulic mining” and “mining by hydraulic process” defined

For the purposes of this chapter “hydraulic mining” and “mining by the hydraulic process” are declared to have the meaning and application given to said terms in the State of California.

( Mar. 1, 1893, ch. 183, § 8 , 27 Stat 508.)