K
Kettle Bottom »
A smooth, rounded piece of rock, cylindrical in shape, which may drop out of the roof of a mine without warning.The origin of this feature is thought to be the remains of the stump of a tree that has been replaced by sediments so that the original form has been rather well preserved.,
A smooth, rounded piece of rock, cylindrical in shape, which may drop out of the roof of a mine without warning.The origin of this feature is thought to be the remains of the stump of a tree that has been replaced by sediments so that the original form has been rather well preserved.,
L
Lamp »
The electric cap lamp worn for visibility. Also, the flame safety lamp used in coal mine to detect methane gas concentration and oxygen deficiency.
The electric cap lamp worn for visibility. Also, the flame safety lamp used in coal mine to detect methane gas concentration and oxygen deficiency.
Layout »
The design or pattern of the main roadways and working. The proper layout of mine working is the responsibility of the planning department.
The design or pattern of the main roadways and working. The proper layout of mine working is the responsibility of the planning department.
Liquefaction »
The process of converting coal into a synthetic fuel,similar in nature to crude oil and or refined products, such as gasoline.
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 arrangment of its component parts. Lithology is the basis of correlation in coal mines and commonly is reliable over a distance of a few miles.
The character of a rock described in terms of its structure, color, mineral composition, grain size, and arrangment of its component parts. 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.
To place explosives in a drill hole. Also, to transfer broken material into a haulage device.
Loading Pocket »
Transfer point at a shaft where bulk material is loaded by bin, hopper, and chute into a skip.
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 front across a face of coal that is usually several hundred feet long. The loosened coal falls onto a conveyor for removal from the mine.
One of three major underground coal mining methods currently in use. Employs a steal plow, or rotation drum, which is pulled mechanically back and front across a face of coal that is usually several hundred feet long. The loosened coal falls onto a conveyor for removal from the mine.
M
Mai entry »
A main haulage road.where the coal has cleat, main entries are driven at right angles to the face cleats.
A main haulage road.where the coal has cleat, main entries are driven at right angles to the face cleats.
Main fan»
A mechanical ventilator installed at the surface, oprates by either exhausting or blowing to induce airflow through mine roadway and working.
A mechanical ventilator installed at the surface, oprates by either exhausting or blowing to induce airflow through mine roadway and working.
Manhole »
A safety hole costructed in the side of the gangway,tunnel or slope in which miner can be sfe from passing locomotive and car. also called a refuse hole.
A safety hole costructed in the side of the gangway,tunnel or slope in which miner can be sfe from passing locomotive and car. also called a refuse hole.
Methane monitor »
An electronic instrument often mounted on piece of minning equipment, that detects and meassures the methane content of mine air.
An electronic instrument often mounted on piece of minning equipment, that detects and meassures the methane content of mine air.
Mine development »
The term employed to designate the opration involved in preparing a mine for ore extraction incluide tunneling ,sinking,cross-cutting,driftting,and raising.
The term employed to designate the opration involved in preparing a mine for ore extraction incluide tunneling ,sinking,cross-cutting,driftting,and raising.
Mineral »
An inorganic compount occurring naturally in the earth'`s crust, with a
distinctive set of physical properties,and a definite chemical compound.
An inorganic compount occurring naturally in the earth'`s crust, with a
distinctive set of physical properties,and a definite chemical compound.
MSHA »
Mine safety and health administration;the federal agency which regukate coam mine health and safety.
Mine safety and health administration;the federal agency which regukate coam mine health and safety.
N
Nip »
Device at the end of the trailing cable of a mining machine used for connecting the trailing cable to the trolley wire and ground.
Device at the end of the trailing cable of a mining machine used for connecting the trailing cable to the trolley wire and ground.
O
Open end pillaring »
A method of mining pillars in which no stump is left; the pockets driven are open on the god side and the roof is supported by timber.
A method of mining pillars in which no stump is left; the pockets driven are open on the god side and the roof is supported by timber.
Ore pass »
An ore pass is an vertical or incline u/g passage way for downward movement of ore by gravity.
An ore pass is an vertical or incline u/g passage way for downward movement of ore by gravity.
Outbye »
Nearer to the shaft,and hence farther from the working face.toward the mine entrance. the opposite af inby.
Nearer to the shaft,and hence farther from the working face.toward the mine entrance. the opposite af inby.
Overburden »
Layer of soil and rock covering a coal seam. overburden is removed prior to surface mining and replaced after the coal is taken from the seam.
Layer of soil and rock covering a coal seam. overburden is removed prior to surface mining and replaced after the coal is taken from the seam.
Overcast(undercast) »
Enclosed airway which permits one air current to pass over (under) another wethout enterruption.
Enclosed airway which permits one air current to pass over (under) another wethout enterruption.
Ore »
An ore is a rock containing minerals which can be used for industrial purpose,economical extraction of metals after processing to seprate the minerals from gangue ore generally occurs in viens and loads.
An ore is a rock containing minerals which can be used for industrial purpose,economical extraction of metals after processing to seprate the minerals from gangue ore generally occurs in viens and loads.
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