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Underground | Definition of Underground by Merriam Webster

Underground | Definition of Underground by Merriam Webster

Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds or rubies. Soft rock mining refers to excavation of softer minerals such as salt, coal, or oil sands

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  • Digging deeper: Mining methods explained | Anglo American

    The methods we use include room and pillar, narrow vein stoping and large-scale mechanised . Room and pillar is a style of where tunnels are driven in a chess board pattern with massive square pillars between them

  • NAICS Code 212112 | Class Codes

     · NAICS Code 212112 – Bituminous Coal . of NAICS Code 212112: This U.S. industry comprises establishments primarily engaged in one or more of the following:. of bituminous coal Developing bituminous coal mine sites and

  • Glossary of Mining Terms - SEC

    Sulphide dust explosions - An hazard involving the spontaneous combustion of airborne dust containing sulphide minerals. Sulphur dioxide - A gas liberated during the smelting of most sulphide ores either converted into sulphuric acid or released into the atmosphere in the form of a gas

  • Underground coal mine | Article about Underground coal

    coal is the extraction of coal from below the surface of the earth. The coal is worked through tunnels, passages, and openings that are connected to the surface for the purpose of the removal of the coal. Mechanical equipment breaks the coal to a size suitable for haulage. Alternatively, the coal is drilled, and the resultant

  • Underground coal mining - definition of Underground coal

    coal synonyms, coal pronunciation, coal translation, English dictionary of coal . coal . Translations. English: coal n estrazione f del carbone

  • Underground mining | Britannica

    In mining: Underground mining When any ore body lies a considerable distance below the surface, the amount of waste that has to be removed in order to uncover the ore through surface mining becomes prohibitive, and underground techniques must be considered. Counting against underground mining

  • Mining - Underground mining | Britannica

    Mining - Mining - Underground mining: When any ore body lies a considerable distance below the surface, the amount of waste that has to be removed in order to uncover the ore through surface mining becomes prohibitive, and underground techniques must be considered

  • Mining

    is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef or placer deposit.These deposits form a mineralized commodity that is of economic interest to the miner. Ores recovered by include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay

  • Mining Terms Explained: A to Z | Anglo American

    an underground tunnel on a mine that follows a seam or vein of ore, which can be used for access or drainage purposes

  • What are the main methods of mining? | American

    There are four main methods: , open surface pit, placer, and in-situ . mines are more expensive and are often used to reach deeper deposits. Surface mines are typically used for more shallow and less valuable deposits. Placer is used to sift out valuable metals from sediments in river channels, beach sands, or other environments

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