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Pages in category "Underground mines in the United States" The following 76 pages are in this category, out of 76 total. This list may not reflect recent changes. A.
The mine naturally maintains year-round temperatures between 65 and 70 °F (18 and 21 °C). The United States Postal Service and the United States Environmental Protection Agency lease spaces within SubTropolis, the United States Postal Service for its collectible stamp operations and the U.S. Environmental Protection Agency for its Region-7 ...
Mine: State: Coordinates: Town: Owner: Dates: Comments: Pyne Mine: Alabama 33°22′33.18″N 86°55′21.65″W Lacey's Chapel: Woodward Iron Company: 1918–1971 One of only two shaft mines dug in the Birmingham District, and the last ore mine to operate in the region, closing in 1971. Sloss Mines: Alabama 33.39816°N 86.93276°W Red Mountain
San Juan Mine 1: San Juan Coal Underground New Mexico: 5,327,442 No 7 Mine: Warrior Met Coal Mining Underground Alabama: 4,864,828 El Segundo El Segundo Coal Surface New Mexico 4,855,010 West Elk Mine: Arch Coal [4] Underground Colorado: 4,821,281 Harvey Mine: CONSOL Energy Underground Pennsylvania
In 1952, the facility was renamed the United States Storage Facility- Atchison Caves. The Army converted two of the largest mines (more than 60 acres (24 ha) of underground space) into storage areas with the installation of concrete block walls, concrete floors, electrical lighting, sump pumps, air handling equipment and an extensive ...
Kennecott's Bingham Canyon Mine is the largest artificially made excavation in the world, and is visible to the naked eye from an orbiting space shuttle. [ 32 ] [ 33 ] [ 34 ] Employing some 2,000 workers, 450,000 short tons (400,000 long tons; 410,000 t) of material are removed from the mine daily.
The Homestake Mine was a deep underground gold mine (8,000 feet or 2,438 m) located in Lead, South Dakota. Until it closed in 2002 it was the largest and deepest gold mine in the Western Hemisphere . The mine produced more than forty million troy ounces (43,900,000 oz; 1,240,000 kg) of gold during its lifetime. [1]
The Mega Cavern is a 4,000,000 square foot (370,000 m 2) [2] structure located in Louisville, Kentucky.About 75–100 feet (23–30 m) underground, [3] [4] [5] the mine stretches under parts of the Watterson Expressway and the Louisville Zoo. [6]