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

Greasy quartz

Mining; General mining

A milk-white, nearly opaque variety of quartz, commonly with a greasy luster. The milkiness is due to the presence of minute, fluid-filled inclusions.

Milky quartz

Mining; General mining

A milk-white, nearly opaque variety of quartz, commonly with a greasy luster. The milkiness is due to the presence of minute, fluid-filled inclusions.

Primary mill

Mining; General mining

A mill for rolling ingots or the rolled products of ingots to blooms, billets, or slabs. This type of mill is often called a blooming mill and sometimes a cogging mill.

Opalescence

Mining; General mining

A milky or somewhat pearly appearance or lustre of a mineral, such as that shown by opal and moonstone. Compare: play of colour

Cannonball mill

Mining; General mining

A mill for grinding tough materials by attrition, using cannonballs in a rotating drum or chamber.

Humosite

Mining; General mining

A microscopical constituent of torbanite; translucent; dark brownish-red; isotropic.

A mine subsidence theory based on an extension of the theory of the normal. In it, subsidence is regarded as taking place in two stages. There is, first, a breaking of the rocks in which the lines of ...