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List Of Articles : L |
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.
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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.
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Leaching
A chemical process for the extraction of valuable minerals from ore (dissolution).
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Life of mine (LOM)
Number of years that the operation is planning to mine and treat ore, and is taken from the current mine plan. LOM may change as new ore reserves are discovered (or due to changes in metal prices).
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Lift
The amount of coal obtained from a continuous miner in one mining cycle.
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Liquefaction
The process of converting coal into a synthetic fuel, similar in nature to crude oil and/or refined products, such as gasoline.
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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.
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Load
To place explosives in a drill hole. Also, to transfer broken material into a haulage device.
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Loading machine
Any device for transferring excavated ore into the haulage equipment.
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Loading pocket
Transfer point at a shaft where bulk material is loaded by bin, hopper, and chute into a skip.
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Lode
The body of ore or valuable mineral, commonly tabular in shape.
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Longwall
Employs a rotation drum, which is pulled mechanically back and forth across a face of coal that is usually around 200m wide. The loosened coal falls onto a conveyor for removal from the mine. Longwalls are operated in panels up to 4 km long. The area behind a longwall is allowed to cave and is termed the ‘goaf’.
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Longwall mining
see Longwall.
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Loose coal
Coal fragments larger in size than coal dust.
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