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

Dowty prop

Mining; General mining

A prop that is in effect a self-contained hydraulic jack consisting of two tubes, the upper one telescoping into the lower. The upper (or inner) tube acts both as a reservoir for the oil and as a ...

Steart fan

Mining; General mining

A propeller or axial-flow fan developed by Steart in Australia.

A property of certain transparent substances that enables the presence of strain to be detected by examination in polarized light. If models of complicated engineering structures are made of such a ...

transformist

Mining; General mining

A proponent of the theory that all granites had a metasomatic or palingenic origin. Compare: magmatist

depletion allowance

Mining; General mining

A proportion of income derived from mining or oil production that is considered to be a return of capital not subject to income tax.

toll enrichment

Mining; General mining

A proposed arrangement by which uranium owned privately could be enriched in uranium-235 content in U.S. Government facilities upon the payment of a service charge.

Atterberg scale

Mining; General mining

A proposed particle-size scale or grade scale for the classification of sediments based on a decimal system beginning with 2 mm. The limits of the subclass are obtained by taking the square root of ...