=1–21= Act of December 24, 1970 (30 U.S.C. Chapter 23): This act provides for geothermal steam leases and should the lease be terminated, the lessee has the right to complete the location of mining claims for minerals subject to location which would constitute a byproduct if commercial production of steam continued. Conversion to a lease under the Mineral Leasing Act for lease minerals is provided for if the lease minerals are capable of being produced in commercial quantities. =1–22= Act of October 21, 1976 (43 U.S.C. 1744; 43 C.F.R. 3833): All unpatented mining claims, including lodes, placers, mill sites and tunnel sites located prior to this date must be recorded with the proper state office of the Bureau of Land Management by filing a copy of the record of the location (or last amended) notice or certificate, as required by state law, together with a map showing the claim and its relation to the public land survey or protracted grid, by October 21, 1979; and also provide evidence of assessment work for the preceding assessment year, or notice of intention to hold, and thereafter prior to December 31 of each calendar year. Claims located after October 21, 1976 shall be recorded within 90 days of date of location and evidence of assessment work or notice of intention to hold, if assessment work is not required, filed prior to December 31 of each calendar year after the year of location. Change in ownership must also be recorded and (presumably) amended location certificates. If these recording requirements are not met, the claims are deemed to be abandoned. =1–23= Reservations, Grants, Withdrawals and Severance of Minerals: Indian and military reservations, national parks and monuments are not, as a rule, open to mineral exploration except in special instances cited in 1–24 below. National forests are open to mineral exploration, location and patent, but subject to rules and regulations of the Forest Service. National Forest Wilderness Areas are covered in 1–24 below. Grants include the Spanish Land Grants, Railroad Grants, and School Grants (School Sections), most of which included the minerals. At least one Spanish Land Grant, The Sangre de Christo Grant comprising Costilla County, Colorado, has its own system of mineral surveys. Arizona has its own rules for locating mining claims on state (school) lands. Indemnity grants were made in lieu of other lands previously appropriated, including unsurveyed school sections appropriated in part under the mining laws. The Alaska Native Claims Settlement Act of December 18, 1971 granted certain lands to the natives in Alaska and allowed owners of claims located prior to August 31, 1971 five years to proceed to patent. Regulations permitted filing an application for mineral survey to be considered an application for patent.