Mining Terminology - L
Lamp - The electric cap lamp worn for visibility or 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.
Lignite - A low-rank coal with relatively high moisture content and relatively low heat/energy content.
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 - Placing explosives in a drill hole or transfering broken material into a haulage device.
Loading machine – A device used 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 is called loading point.
Longwall Mining –A major underground coal mining method currently in use, that employs a steal plow, or rotation drum 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 sulphur coal - Coal which has a sulphur content generally ranging from 0.1 per cent to 1.0 per cent.