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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
Johannsen's classification
Mining; General mining
A quantitative mineralogic classification of igneous rocks developed by the petrographer Albert Johannsen (1939). Compare: Johannsen number
Troeger's classification
Mining; General mining
A quantitative mineralogic classification of igneous rocks proposed by E. Troeger in 1935.
scalar
Mining; General mining
A quantity fully described by a number, such as a speed that has no associated direction.
single consignment
Mining; General mining
A quantity of coal that is to be sampled to a specified accuracy. It is used in contradistinction to the sampling of a coal received regularly at a given point.
commercial quantity
Mining; General mining
A quantity of oil, gas, or other minerals sufficient for production in paying quantities.
differential curvature
Mining; General mining
A quantity represented by the acceleration due to gravity times the difference in the curvatures in the two principal planes; i.e., g(1/p 1 - 1/p 2 ) where p 1 and p 2 are the radii of curvature of ...
