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

piezometric surface

Mining; General mining

An imaginary surface representing the total head of ground water; defined by the level to which water will rise in a well. The water table is a particular potentiometric surface.

pressure surface

Mining; General mining

An imaginary surface representing the total head of ground water; defined by the level to which water will rise in a well. The water table is a particular potentiometric surface.

reconstructed turquoise

Mining; General mining

An imitation turquoise made of finely powdered ivory which is deposited in a solution of copper.

hammer breaker

Mining; General mining

An impact type of breaker consisting of a number of swinging bars or steel hammers hinged to a horizontal shaft that rotates at high speed.

bumper block

Mining; General mining

An impeding device at dumping locations where there is a hazard of vehicle overtravel.

lineage

Mining; General mining

An imperfection in a crystal structure characterized by a series of line defects, but not extensive enough to form a grain boundary. Compare: grain boundary; crystal defect.

line defect

Mining; General mining

An imperfection in crystal structure characterized by an atomic layer extending part way into a crystal structure. Compare: crystal defect; edge dislocation.