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

dysprosia

Mining; General mining

A rare-earth oxide; white; Dy 2 O 3 ; isometric; sp gr, 7.81 (at 27 degrees C); and melting point, 2,340+ or -10 degrees C. Used as a nuclear-reactor control-rod component and a neutron-density ...

freyalite

Mining; General mining

A rare-earth-rich variety of thorite from Brevik, Norway.

tantalum

Mining; General mining

A rather brittle, lustrous, hard, heavy, gray metallic element. Symbol, Ta. Occurs principally in the mineral columbite-tantalite, (Fe,Mn)(Nb,Ta) 2 O 6 . Widely used to fabricate chemical process ...

coefficient of acidity

Mining; General mining

A ratio, calculated from the normative molecular proportions of the constituents of a rock or slag; e.g., number of atoms of oxygen in SiO 2 / number of atoms of oxygen in the basic oxides.

zurron

Mining; General mining

A rawhide sack that holds about 150 lb (68.1 kg); used by miners for carrying ore.

beta ray

Mining; General mining

A ray of electrons emitted during the spontaneous disintegration of certain atomic nuclei.

lime boil

Mining; General mining

A reaction in an open-hearth furnace caused by the decomposition of limestone and the escape of the carbon dioxide gas. This reaction begins before the ore boil is completed.