25 CFR §215.18
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The term of lead and zinc mining leases executed pursuant to acts of Congress and under the regulations in this part shall be for such period of time as may be determined in each case by the Secretary of the Interior, but in no case shall a lease be made to extend beyond the restriction or trust period on the lands covered by such lease.