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

nigritite

Mining; General mining

A product of the coalification of fix bitumens rich in carbon; insoluble or only slightly soluble in organic solvents. It is subdivided into polynigritite, humonigritite, exinonigritite, and ...

effective breaking force

Mining; General mining

A product of the weight, strength and the degree of packing, calculated per volume of a given drill hole.

yellow ozokerine

Mining; General mining

A product resembling vaseline, but less homogeneous; produced from crude ozokerite.

scarcement

Mining; General mining

A projecting ledge of rock, left in a shaft as footing for a ladder or to support pitwork.

tenon

Mining; General mining

A projecting tongue fitting into a corresponding cavity called a mortise.

A prominent isolated residual knob, hill, or small mountain rising abruptly from an extensive erosion surface in a hot, dry region (as in the deserts of southern Africa or Arabia), generally bare and ...

hydraulic prop

Mining; General mining

A prop consisting of two telescoping steel cylinders that are extended by hydraulic pressure that may be provided by a hand-operated pump built into the prop. The prop holds about half a gallon of ...