43 CFR § 3834.21
How will BLM adjust the location and maintenance fees?
June 11, 2020
BLM will adjust the location and maintenance fees at least every 5 years, based upon the CPI, as required by 30 U.S.C. 28j(c), or at any other time as required by other statute.
[70 FR 52030, Sept. 1, 2005]