7 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
Spessartite
Mining; General mining
A "lamprophyre" composed of phenocrysts of green hornblende or clinopyroxene in a ground mass of sodic plagioclase, with accessory olivine, biotite, apatite, and opaque oxides. Named for Spessart, ...
Ratio of concentration
Mining; General mining
(Weight of ore fed) / (Weight of concentrate produced).
Spessartine
Mining; General mining
A "lamprophyre" composed of phenocrysts of green hornblende or clinopyroxene in a ground mass of sodic plagioclase, with accessory olivine, biotite, apatite, and opaque oxides. Named for Spessart, ...
Heat-treated stone
Mining; General mining
A (gem) stone that has been artificially heated to change its color.
Burnt stone
Mining; General mining
A (gem) stone that has been artificially heated to change its color.
Cone penetrometer
Mining; General mining
A 30 degrees to 60 degrees cone having a basal diameter approx. the same size as an asize diamond-drill rod used to determine the force required to thrust the cone downward into silty or fine to ...
