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Mining
Glossary
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G
Gassy - A coal mine is rated
gassy by the U.S. Bureau of Mines if an ignition occurs or if
a methane content exceeding 0.25 percent can be detected, and
work must be halted if the methane exceeds 1.5 percent in a return
airway.
Gather - To assemble loaded cars from several
production points and deliver them to main haulage for transport
to the surface or pit bottom.
Gathering Locomotive - A lightweight type of
electric locomotive used to haul loaded cars from the working
places to the main haulage road, and to replace them with empties.
Gob - To store underground, as along one side
of a working place, the rock and refuse encountered in mining.
The material so packed or stored underground. The space left by
the extraction of a coal seam into which waste is packed. Also
called goaf.
Gob Pile - A pile or heap of mine refuse on
the surface. An accumulation of waste material such as rock or
bone.
Gross Ton - The long ton of 2,240 avoirdupois
pounds.
Ground Water - Water at, and below, the water
table; basal or bottom water; phreatic water. Used also in a broad
sense to mean all water below the ground surface. Water derived
from wells or springs, not surface water from lakes or streams.
Gunite - A mixture of sand and
cement, sprayed with a pressure gun onto roofs and ribs to act
as a sealing agent to prevent erosion by air and moisture.
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