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Wikipedia articles incorporating a citation from the New International Encyclopedia
Extraction of valuable minerals or other geological materials from the earth
A sector of the economy in which an aggregate of commercial enterprises is engaged in the extraction of minerals occurring naturally, often involving quarrying, well operations, milling, exploration and development.
The removal of earth from its natural position.
Waste material resulting from ore extraction that is usually left on the soil surface.
The act, process or industry of extracting coal, ores, etc. from the earth.
The activity of removing solid valuables from the earth.