Illustrated Mining Terms


Lagging - planks or split-round timber placed around timbered sets to keep material from falling into the opening. Also used for flooring. Photo 6
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.

Lateral - a horizontal mine working.  
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 - using chemicals or solvents to win the valuable material from ore

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Level - all the connected horizontal mine openings at a certain elevation.  
Liquefaction – The process of converting coal into a synthetic fuel, similar in nature to crude oil and/or refined products, such as gasoline.

Integrated Catalytic Two-Stage Liquefaction

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.

Map-unit and lithology components for heterolithic units

Load - To place explosives in a drill hole. Also, to transfer broken material into a haulage device.  
Loading machine - Any device for transferring excavated material 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.

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.

Mining coal underground using a "longwall"

Low voltage - Up to and including 660 volts by federal standards.  

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