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

Torsion break

Mining; General mining

A break in the drill core caused by an accumulation of chips at the bit face. When drilling is stopped to rechuck, these chips grip the core, and the core is twisted and broken. Compare: torsion ...

Gargulho

Mining; General mining

A Brazilian term used in the plateau region of Bahia for a comparatively coarse, claycemented, ferruginous conglomerate in which diamonds are found.

Water break

Mining; General mining

A break in the continuity of the water film upon a metal when it is withdrawn from a bath. Compare: wetting.

Zorgite

Mining; General mining

A brass-yellow metallic mineral with dark yellow streak; possibly clausthalite with umangite.

Rotary breaker

Mining; General mining

A breaking machine for coal, rock, or minerals. It consists of a trommel screen with a heavy cast steel shell fitted internally with lifts that progressively raise and convey the coal and stone ...

Pick breaker

Mining; General mining

A breaker developed as the mechanical equivalent of the miner's pick. In the modern type, the picks are mounted on alternating arms, the primary and secondary picks being at different spacings so ...

A breaker where the coal from a number of mines in a district is prepared. Central breakers, representing the last word in mining technology, make it economical for operators to abandon many local ...