Lamp - The electric cap lamp worn for visibility. Also, the flame safety lamp used in coal mines to detect methane gas concentrations and oxygen deficiency.
Layout - The design or pattern of the main roadways and workings. The proper layout of mine workings is the responsibility of the manager aided by the planning department.
Lift - The amount of coal obtained from a continuous miner in one mining cycle.
Liquefaction – The process of converting coal into a synthetic fuel, similar in nature to crude
oil and/or refined products, such as gasoline.
Lithology - The character of a rock described in terms of its structure, color, mineral composition, grain size, and arrangement of its component parts; all those visible features that in the aggregate impart individuality of the rock. Lithology is the basis of correlation in coal
mines and commonly is reliable over a distance of a few miles.
Load - To place explosives in a drill hole. Also, to transfer broken material into a haulage device.
Loading machine - Any device for transferring excavated coal into the haulage equipment.
Loading pocket - Transfer point at a shaft where bulk material is loaded by bin, hopper, and chute into a skip.
Longwall Mining – One of three major underground coal mining methods currently in use. Employs a steal plow, or rotation drum, which is pulled mechanically back and forth across a face of coal that is usually several hundred feet long. The loosened coal falls onto a conveyor for removal from the mine.
Loose coal - Coal fragments larger in size than coal dust.
Low voltage - Up to and including 660 volts by federal standards.
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