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

Trackless tunnelling

Mining; General mining

A method of tunnelling using loaders mounted on crawler tracks, and a diesel- or batterypowered dump-truck haulage system.

Loose-needle traversing

Mining; General mining

A method of traversing in which the magnetic bearings of survey lines are separately obtained by reference to the magnetic needle.

Continuous azimuth method

Mining; General mining

A method of traversing by which the azimuth of the survey lines is obtained from the instrument.

Centre core method

Mining; General mining

A method of tunnelling whereby the centre is left to the last for excavation.

Decussate texture

Mining; General mining

A microtexture in metamorphosed rocks, in which axes of contiguous crystals lie in diverse, crisscross directions that are not random but rather are part of a definite mechanical expedient for ...

A mill for dry-grinding mica by means of fluid energy. It consists of a chamber containing two horizontal directly opposed jets. Mica is fed continuously from a screw conveyor into this chamber. The ...

Shelf angle

Mining; General mining

A mild steel angle section, riveted or welded to the web of a comparatively deep I-beam supporting the formwork for hollow tiles or forming the seating for precast concrete floor or roof units.