4 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
rolled-steel joist
Mining; General mining
An I-beam made from a single piece of steel passed through a hot rolling mill.
ice plug
Mining; General mining
An ice obstruction formed by a circulation medium freezing inside the drill-rod couplings while the rods are racked up or standing in the drill derrick or tripod in extremely cold weather. Such plugs ...
rock glacier
Mining; General mining
An ice-cored mass of angular rock waste, usually heading in a cirque or other steepwalled amphitheater and in many cases grading into a true glacier.
surturbrand
Mining; General mining
An Icelandic term for a peatlike variety of brown coal or lignite occurring in the Pliocene deposits and sometimes under the volcanic overflows of Iceland.
flat belt idler
Mining; General mining
An idler consisting of one or more rolls supporting the belt in a flat position.
snub pulley
Mining; General mining
An idler pulley so mounted as to increase the arc of contact between a belt and a drive pulley. When used in a wrap drive, it has the added function of changing the direction of the return belt ...
takeup pulley
Mining; General mining
An idler pulley so mounted that its position is adjustable to accommodate changes in the length of the belt as may be necessary to maintain proper belt tension.
