30 U.S. Code § 1001. Definitions
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As used in this chapter, the term—
“geothermal lease” means a lease issued under authority of this chapter;
“geothermal resources” means (i) all products of geothermal processes, embracing indigenous steam, hot water and hot brines; (ii) steam and other gases, hot water and hot brines resulting from water, gas, or other fluids artificially introduced into geothermal formations; (iii) heat or other associated energy found in geothermal formations; and (iv) any byproduct derived from them;
“byproduct” means any mineral or minerals (exclusive of oil, hydrocarbon gas, and helium) which are found in solution or in association with geothermal steam and which have a value of less than 75 per centum of the value of the geothermal steam or are not, because of quantity, quality, or technical difficulties in extraction and production, of sufficient value to warrant extraction and production by themselves;
“known geothermal resources area” means an area in which the geology, nearby discoveries, competitive interests, or other indicia would, in the opinion of the Secretary, engender a belief in men who are experienced in the subject matter that the prospects for extraction of geothermal steam or associated geothermal resources are good enough to warrant expenditures of money for that purpose.
(f) “Significant  thermal features within units of the National Park System” shall include, but not be limited to, the following:
Thermal features within units of the National Park System listed in Section 1 1026(a)(1) of this title and designated as significant in the Federal Register notice of August 3, 1987 (Vol. 52, No. 148 Fed. Reg. 28790).
Thermal features within Big Bend National Park and Lake Mead National Recreation Area proposed as significant in the Federal Register notice of February 13, 1987 (Vol. 52, No. 30 Fed. Reg. 4700).
Thermal features within units of the National Park System added to the significant thermal features list pursuant to section 1026(a)(2) of this title.
2005—Pub. L. 109–58, § 236(5), inserted section catchline.
Par. (g). Pub. L. 109–58, § 236(2), added par. (g).
1988—Par. (f). Pub. L. 100–443 added par. (f).
Short Title of 2005 Amendment
“This subtitle [subtitle B (§§ 221–237) of title II of Pub. L. 109–58, enacting part B (§ 15871 et seq.) of subchapter II of chapter 149 of Title 42, The Public Health and Welfare, amending this section and sections 530 and 1002 to 1027 of this title, enacting provisions set out as notes under section 1004 of this title, and amending provisions set out as a note under this section] may be cited as the ‘John Rishel Geothermal Steam Act Amendments of 2005’.”
Short Title of 1988 Amendment
 So in original. Probably should not be capitalized.
 So in original. Probably should end with a period instead of “; and”.