24 Terms
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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
Ingotism
Mining; General mining
A defect common to almost all metal ingots in which metal crystals (dendrites) tend to grow at right angles to the walls of the mould and form planes of weakness at their junctions; these make the ...
Industrial degree-day
Mining; General mining
A degree-day unit based on a (usually) 45 degrees F or 55 degrees F (7.2 degrees C or 12.9 degrees C) mean daily temperature so as to be applicable to industrial buildings maintained at relatively ...
Black gunpowder
Mining; General mining
A deflagrating or low-explosive granular compound of sulfur, charcoal, and an alkali nitrate, usually potassium or sodium nitrate.
Echelon pattern
Mining; General mining
A delay pattern that causes the true burden, at the time of detonation, to be formed at an oblique angle from the original free face.
Semitranslucent
Mining; General mining
A degree of diaphaneity between translucent and opaque. Passes light through edges of cabochons but very little through thicker parts.
Black powder
Mining; General mining
A deflagrating or low-explosive granular compound of sulfur, charcoal, and an alkali nitrate, usually potassium or sodium nitrate.
Stebinger drum
Mining; General mining
A delicate vertical-angle adjustment for the vernier on the alidade, graduated in hundredths of a revolution. Compare: tangent screw
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