20 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
Isogam map
Mining; General mining
A chart showing contour lines of equal magnetic field intensity and employed in the magnetic methods of geophysical prospecting.
Limit charge
Mining; General mining
A charge that gives a complete loosening of the rock without throwing it excessively.
Receptor
Mining; General mining
A charge of explosives or blasting agent receiving an impulse from an exploding donor charge.
Duoflex checker system
Mining; General mining
A checker arrangement for hot-blast stoves. The gas used is only partially cleaned and may contain from 0.5 to 1.5 g of dust per cubic metre of gas. The top zone of the checkers is formed of ...
Loewinson-Lessing classification
Mining; General mining
A chemical classification of igneous rocks (into the four main types--acid, intermediate, basic, and ultrabasic) based on silica content.
Nitrocotton
Mining; General mining
A chemical combination of ordinary cotton fibre with nitric acid. It is explosive, highly inflammable, and in certain degrees of nitration, soluble in nitroglycerin.
Cooling agent
Mining; General mining
A chemical added to an explosive during manufacture to suppress or inhibit the flame produced in blasting.
