Mineral mining

Mineral mining

The extraction of valuable minerals or other geological materials from the earth for economic interests.

Industry: Mining

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Mineral mining

mining theodolite

Mining; General mining

A theodolite having particular features of design that make it suitable as an underground surveying instrument; e.g., incorporating an arrangement for the centering movement to be above the foot ...

normal theory

Mining; General mining

A theory claiming that the removal of a coal seam caused the overlying strata to fracture at right angles to the inclination of the beds. Subsidence observations do not support this theory.

Bond and Wang theory

Mining; General mining

A theory of crushing and grinding; the energy (h) required for crushing varies inversely as the modulus of elasticity (E) and specific gravity (S), and directly as the square of the compressive ...

gulch

Mining; General mining

A term used esp. in the Western United States for a narrow, deep ravine with steep sides, larger than a gully; esp. a short, precipitous cleft in a hillside, formed and occupied by a torrent, and ...

isobase

Mining; General mining

A term used for a line that connects all areas of equal uplift or depression; it is used esp. in Quaternary geology as a means for expressing crustal movements related to postglacial uplift.