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
Blind hole
Mining; General mining
A borehole in which the circulating medium carrying the cuttings does not return to the surface.
Cased
Mining; General mining
A borehole lined with some form of steel tubing, such as casing or pipe.
Multishot gyroscopic instrument
Mining; General mining
A borehole surveying instrument that can take a number of readings during its descent and ascent in the borehole. It comprises gyroscopic and photographic recording units; direction and inclination ...
Gebhardt survey instrument
Mining; General mining
A borehole surveying instrument often used to test the verticality of the freezing holes in shaft sinking. A vernier scale is used to determine the positions of the pendulum points at successive ...
Oriented survey
Mining; General mining
A borehole survey made by lining up a reference mark on the clinometer case with that on the drill rods, which in turn are oriented as they are lowered into the borehole.
Single-shot instrument
Mining; General mining
A borehole surveying instrument that records only one measurement of the bearing and of the inclination of a hole on a single trip into the borehole.
Deep well
Mining; General mining
A borehole put down through an upper impervious bed into a lower pervious one, from which a supply of water is obtained.
