A - E






A

Acid Mine »
Mine water that contains free sulfuric acid mainly due to the weathering of iron pyrites.
Adit »
A near Horizontal passage from the surface by which a mine is entered and deatred. A blind horizontal opening into a mountain, with only one entrance.
Active Workings »
Any place in a mine where miners are normally required to work or travel and which are ventilated and inspected regularly.
Advance »
Mining in the same direction,or order of sequence, first mining as distinguished from retreat.
Air split »
The division of a current of air into two or more parts.
Air way »
Any passage through which air is carried. also known as an air course.
Anemometer »
Instrument for messuring air velocity.
Angle of dip »
The angle at which strata or mineral deposits are inclined to the horizontal plane.
Angle of repose »
The maximam angle of horizontal at which a given matarial will rest on a given surface wethout sliding or rolling.
Anticline »
An upward fold or arch of rock strata.
Aquifer »
A water bearing bed of porous rock, often sandstone.
Arching »
Fracture processes around a mine openin,leading to stabilization by an arching effect.
Area (an airway) »
Average width multiplied by average height of air airway, expressed in square feet.
Auger »
A rotary drill that uses a scrw device to penetrate,break,and then transport the drilled matarial (coal).
Auxiliary opration »
All activities supportive of but not contributing directly to mining.
Auxiliary ventilation »
Portion of main ventilating current directed to face of dead end entry by means of an auxiliary fan and tubing.
Azimuth »
A surveying turm that references the angle messured clockwise from any meridian(The established line of reference). the bearing is used to designate direction. the bearing of a line is the acute horizontal angle b/w the meridian and the line.


B

Belt conveyor »
A looped belt on which the coal or other matarial can be carried and which is generally constructed of flame resistant matarial or of reinforced rubber or rubber like substance.
Bed »
A stratum of coal or other sedimentary deposite.
Bench »
One of to or more division of a coal seam seprates by state or formed by the process of cutting the coal.
Beneficiation »
The treatment of mined matarial, making it more concentrated or richer.
Berm »
A pile or mound of matarial capable restraining a vehicle.
Binder »
A streak of impurity ina coal seam.
Bituminous coal »
A middle rank coal formed by additional pressure and heat on lignite.
Blasting agent »
Any matarial consisting of a mixture of a fuel and an oxidizer.
Blasting cap »
A detonator containing a charge of detonating compound,which is ignited b electric current or the spark of a fuse. used for detonating explosives.
Blasting circuit »
Electric circuit used to fire electric detonators or to ignite an ignite an igniter cord by means of an electric starter.
Borhole »
Any deep or long drill-hole,usually associated with a diamond drill.
Bottom »
Floor or underlying surface of an underground excavation.
Boss »
Any member of the managerial rank who is directly in charge of miners.
Breakethrough »
A passage for ventilation that is cut through he pillars between rooms.
Brow »
A low place in the roof of a mine, giving insufficient headroom.


C

Cage »
In a mine shaft, the device similar to an elevator car, that is used for hoisting personnel and materials.
Calorific Value »
The quantity of heat that can be liberated from one pound of coal or oil measured in BTU's.
Canopy »
A protective covering of a cab on a mining machine.
Cap »
A miner's safety helmet. Also, a highly sensitve, encapsulated explosive that is used to detonate large but less sensitive explosives.
Cap Block »
A flat piece of wood inserted between the top of the prop and the roof to provide bearing support.
Car »
A railway wagon, especially any of the wagons adapted to carrying coal, ore, and waste underground.
Car-Dump »
The mechanism for unloading a loaded car.
Caste »
A directed throw, in strip-mining, the overburden is cast from the coal to the previously mined area.
Certified »
Describes a person who has passed an examination to do a required job.
Chain Conveyor »
A conveyor on which the material is moved along solid pans by the action of scraper crossbars attached to powered chains.
Cleat »
The vertical cleavage of coal seams. The main set of joints along which coal breaks when mined.
Coal Dust »
Particles of coal that can pass a No. 20 sieve.
Coal Reserves »
Measured tonnages of coal that have been calculated to occur in a coal seam within a particular property.
Coal Gasification »
The Conversion of coal into gaseous fuel.
Coke »
A hard, dry carbon substance produced by heating coal to very high temperature in the absence of air.
Collar »
The term applied to the timbering or conrete around the mouth or top of a shaft. The beginning point of a shaft or drill hole at the surface.
Colliery »
British name for coal mine.
Comminution »
The breaking, crushing, or grinding of coal, ore, or rock.
Contour »
An imaginary line that connects all pointson a surface having the same elevation.


D

Deposit »
Mineral deposit or ore deposit is used to designate a natural occurrence of useful mineral, in sufficient extent.
Depth »
Denotes vertical depth below the surface.
Detectors »
Specialized chemical or electronic instruments used to detect mine gases.
Detonator »
A device containing a small detonating charge that is used for detonating an explosive.
Development »
Work undertaken to open up coal reserves as distinguished from the work of actual coal extraction.
Diffusion »
Blending of a gas and air,resulting in a homogeneous mixture.
Diffuser Fan »
A fan mounted on a continuous miner to assist and direct air delivery from the machine to the face.
Dilute »
To lower the concentration of a mixture.
Dilution »
The contamination of ore with barren wall rock in stoping.
Dip »
The inclination of a geological structure from the horizontal.It is always measured downwards at right angle to the strike.
Dome »
A rock structure containing the oldest strata at the inner portion and youngest at the outer portion.
Dragline »
A large excavation machine used in surface mining to remove overburden covering the coal seam.
Drainage »
The process of removing surplus ground or surface water either by artificial means or by gravity flow.
Drift »
A horizontal passage underground.A drift follows the veins,as distinguished from a crosscut that intersects it.
Drift Mine »
An u/g coal mine in which the entry or access is above water leveland generally on the slope of a hill,driven horizontally into a coal seam.
Drill »
A machine utilizing rotation,percussion, or a combination of both to make holes.
Drilling »
The use of such a machine to createholes for exploration or for loading with explosives.
Dummy »
A bag filled with sand,clay etc., used for stemming a charged hole.
Dump »
To unload;specially, a load of coal or waste.

E

Electrical Grounding »
To connect with the ground to make the earth part of the circuit.
Entry »
An u/g horizontal or near-horizontal passage used for haulage,ventilatio, or as a mainway; a coal heading; a working place where the coal is extracted from the seam in the initial mining.
Evaluation »
The work involved in gaining a knowledge of the size,shape,position and value of coal.
Exploration »
The search for mineral deposits and the work doe to prove or establish the extent of a mineral deposit.
Explosive »
Any rapidly combustive or expanding substance.The energy released during this rapid combustion or expansion can be used to break rock.
Extraction »
The process of mining and removal of coal or ore from a mine.

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