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

Thin-wall bit

Mining; General mining

A coring bit the kerf or wall thickness of which is about one-half or less that of the wall thickness of the same outside-diameter-size standard coring bit.

Mock lead

Mining; General mining

A Cornish term for zinc blende; also called wild lead. See: sphalerite.

Bal

Mining; General mining

A Cornish name for a mine; a cluster of mines.

Amphibolite

Mining; General mining

A crystalloblastic rock consisting mainly of amphibole and plagioclase with little or no quartz. As the content of quartz increases, the rock grades into hornblende plagioclase gneiss. Compare: ...

Commercial marble

Mining; General mining

A crystalline rock composed predominantly of one or more of the following minerals: calcite, dolomite, or serpentine, and capable of being polished.

Diaphthorite

Mining; General mining

A crystalline rock in which minerals characteristic of a lower metamorphic grade have developed by retrograde metamorphism at the expense of minerals peculiar to a higher metamorphic grade.