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    Mysterious and often inexplicable remnants of civilization's history fascinate scientists and archaeologists. People travel worldwide to visit such sites, yet some of the most enigmatic artifacts and structures have been found right here in North America.

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  • Coal mining in Kentucky - Wikipedia

    Starting in the 1960s coal seams in both Kentucky coal fields have been increasingly accessed via a method known as Mountaintop Removal Mining, which is a form of surface mining that involves the topographical alteration and/or removal of a summit, summit ridge, or significant portion of a mountain, hill, or ridge in order to obtain a desired geologic material.

  • Glossary of Mining Terms - rocksandminerals.com

    Abutment — In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face.

  • How Coal Works | Union of Concerned Scientists

    Strip mining is used when coal seams are located close to the surface. It relies on very large machinery and requires many fewer workers per unit of coal. First, vegetation and soil are removed from the immediate surface.

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  • Glossary of Mining Terms - Coal Education

    A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face.

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    A Glossary of Ecological Terms. terrapsych.com. Coagulated by Craig Chalquist, PhD, author of Terrapsychology: Reengaging the Soul of Place (Spring Journal Books, 2007)

  • Asteroid mining - Wikipedia

    Asteroid mining is the exploitation of raw materials from asteroids and other minor planets, including near-Earth objects.. Minerals can be mined from an asteroid or spent comet then used in space for construction materials or taken back to Earth.

  • Steel construction products - Steelconstruction.info

    The amount of metallic coating applied to the steel varies depending upon the coating applied and the application. For strip steel construction products the common coating weight applied is 275 g/m² of zinc.

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  • High Strength Carbon and Low Alloy Steels | ispatguru.com

    High Strength Carbon and Low Alloy Steels. High strength carbon (C) and low alloy steels have yield strength (YS) greater than 275 N/sq mm and can be classified generally in four types namely (i) as-rolled C – Mn (manganese) steels, (ii) as rolled high strength low alloy (HSLA) steels also known as micro-alloyed steels, (iii) heat treated (normalized or quenched and tempered) C steels, and ...

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    Auctions for the sale of surplus, salvage, scrap, damaged, bankrupt inventories for asset recovery, insurance, transportation, manufacturing, oil and gas industries.

  • copper processing | Definition, History, & Facts | Britannica.com

    Copper processing: Copper processing, the extraction of copper from its ores and the preparation of copper metal or chemical compounds for use in various products.

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  • Mining - Atomic Rockets

    "Demandite" is the word used by mineral economists to describe the materials that must be provided— usually by mining— to meet the needs of civilization.