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  2. Underground hard-rock mining - Wikipedia

    en.wikipedia.org/wiki/Underground_hard-rock_mining

    There are two principal phases of underground mining: development mining and production mining. Development mining is composed of excavation almost entirely in (non-valuable) waste rock in order to gain access to the orebody. There are six steps in development mining: remove previously blasted material (muck out round), scaling (removing any unstable slabs of rock hanging from the roof and ...

  3. Kiruna mine - Wikipedia

    en.wikipedia.org/wiki/Kiruna_Mine

    The Kiruna mine is the largest and most modern underground iron ore mine in the world. [1] [unreliable source?] The mine is located in Kiruna in Norrbotten County, Lapland, Sweden. [1] The mine is owned by Luossavaara-Kiirunavaara AB (LKAB), a large Swedish mining company. In 2018 the mine produced 26.9 million tonnes of iron ore. [2]

  4. SubTropolis - Wikipedia

    en.wikipedia.org/wiki/SubTropolis

    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 ...

  5. Longwall mining - Wikipedia

    en.wikipedia.org/wiki/Longwall_mining

    Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6–6.0 m (2 ft 0 in – 19 ft 8 in) thick). The section of rock that is being mined, known as the longwall panel, is typically 3–4 km (1.9–2.5 mi) long, but can be up to 7.5 km (4.7 mi) long and 250–400 m (820–1,310 ft) wide.

  6. Category:Underground mines in the United States - Wikipedia

    en.wikipedia.org/wiki/Category:Underground_mines...

    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 .

  7. Category:Underground mining - Wikipedia

    en.wikipedia.org/wiki/Category:Underground_mining

    Pages in category "Underground mining" The following 39 pages are in this category, out of 39 total. This list may not reflect recent changes. ...

  8. Homestake Mine (South Dakota) - Wikipedia

    en.wikipedia.org/wiki/Homestake_Mine_(South_Dakota)

    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]

  9. Salina Turda - Wikipedia

    en.wikipedia.org/wiki/Salina_Turda

    Salina Turda – view of the underground lake and UFO-shaped constructions The access tunnel. This is a conical mine (bell mine). Salt mining in this type of room left behind underground halls of impressive dimensions: 90 metres (300 ft) height and 87 metres (285 ft) diameter.