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    Tools for mining engineers to design, evaluate and maintain daily open pit mine operations.

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  • Mining | Britannica

    Mining: Mining, process of extracting useful minerals from the surface of the Earth, including the seas. A mineral, with a few exceptions, is an inorganic substance ...

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    means a horizontal step or floor above which material is excavated from a contiguous face and upon which drilling, blasting and material haulage may be conducted ...

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    Chalk ( / ˈ tʃ ɔː k /) is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite. Calcite is an ionic salt called ...

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    Archives and past articles from the Philadelphia Inquirer, Philadelphia Daily News, and Philly.