F
Face Cleat »
The principal cleavage plane or joint at right angles to the stratification of the coal seam.
The principal cleavage plane or joint at right angles to the stratification of the coal seam.
Face conveyor »
Any conveyor used parallel to a working face which delivers coal into another conveyor or into a car.
Any conveyor used parallel to a working face which delivers coal into another conveyor or into a car.
Factor of safety »
The ratio of ultimate breaking strength of the material to the force exerted against it.
The ratio of ultimate breaking strength of the material to the force exerted against it.
Fan(Auxiliary) »
A small, portable fan used to supplement the ventilation of an individual working place.
A small, portable fan used to supplement the ventilation of an individual working place.
Fault »
A fault is fracture in rock usually associated with lateral/vertical displacement of the fractured beds.
A fault is fracture in rock usually associated with lateral/vertical displacement of the fractured beds.
Fire Damp »
the combustible gas,methane(CH4). also, the explosive methane-air mixtures with between 5% and 15% methane.
the combustible gas,methane(CH4). also, the explosive methane-air mixtures with between 5% and 15% methane.
Fixed Carbon »
The part of the carbon that remains behind when coal is heated in a closed vessel until all of the volatile matter is driven off.
The part of the carbon that remains behind when coal is heated in a closed vessel until all of the volatile matter is driven off.
Float Dust »
fine coal-dust particles carried in suspension by air current and eventually deposited in return entries.
fine coal-dust particles carried in suspension by air current and eventually deposited in return entries.
Floor »
That part of any underground working upon which a person walks or upon which haulage equipment travels;simply the bottom or underlying surface of an underground excavation.
That part of any underground working upon which a person walks or upon which haulage equipment travels;simply the bottom or underlying surface of an underground excavation.
Fly Ash »
The finely divided particles of ash suspended in gases resulting from the combustion of fuel. Electrostatic precipitators are used to remove fly ash from the gases prior to the release from a power plants smokestack.
The finely divided particles of ash suspended in gases resulting from the combustion of fuel. Electrostatic precipitators are used to remove fly ash from the gases prior to the release from a power plants smokestack.
Formation »
Any assemblage of rock which have some character in common, whether of origin, age or composition.
Any assemblage of rock which have some character in common, whether of origin, age or composition.
Fracture »
A general term to include any kind of discontinuity in a body of rock if produced by mechanical failure, whether by shear stress or tensile stress.
A general term to include any kind of discontinuity in a body of rock if produced by mechanical failure, whether by shear stress or tensile stress.
G
Gob »
The term applied to that part of the mine from which the coal has been removed and the space more or less filled up with waste.Also called GOAF.
The term applied to that part of the mine from which the coal has been removed and the space more or less filled up with waste.Also called GOAF.
Grain »
In petrology,that factor of the texture of a rock composed of distinct principles or crystals which depends upon their absolute size.
In petrology,that factor of the texture of a rock composed of distinct principles or crystals which depends upon their absolute size.
Grizzly »
Course screening or scalping device that prevents oversized bulk material from entering a material transfer system.
Course screening or scalping device that prevents oversized bulk material from entering a material transfer system.
Ground Control »
The regulation and final arresting of the closure of the walls of a mined area. The term generally refers to measures taken to prevent roof falls or coal bursts.
The regulation and final arresting of the closure of the walls of a mined area. The term generally refers to measures taken to prevent roof falls or coal bursts.
H
Haulage »
The horizontal transport of ore,coal,supplies and waste.The vertical of the same is called HOISTING.
The horizontal transport of ore,coal,supplies and waste.The vertical of the same is called HOISTING.
Headframe »
The structure surmounting the shaft which supports the hoist rope pulley, and often the hoist itself.
The structure surmounting the shaft which supports the hoist rope pulley, and often the hoist itself.
Heading »
A vein above a drift. An interior level or airway driven in a mine.In L/W workings,a narrow passage driven upward from a gangway in starting a working in order to give a loose end.
A vein above a drift. An interior level or airway driven in a mine.In L/W workings,a narrow passage driven upward from a gangway in starting a working in order to give a loose end.
Head Section »
A term used in both belt and chain conveyor work to designate that portion of the conveyor used for discharging material.
A term used in both belt and chain conveyor work to designate that portion of the conveyor used for discharging material.
Highwall »
The unexcavated face of the exposed O/B and coal in a surface mine or in a face or bank on the uphill side of a contour mine excavation.
The unexcavated face of the exposed O/B and coal in a surface mine or in a face or bank on the uphill side of a contour mine excavation.
Hoist »
A drum on which hoisting rope is wound in the engine house, as the cage or skip is raised in the hoisting shaft.
A drum on which hoisting rope is wound in the engine house, as the cage or skip is raised in the hoisting shaft.
Horizon »
In geology, any given definite position or interval in the stratigraphic column or the scheme of stratigraphic classification.
In geology, any given definite position or interval in the stratigraphic column or the scheme of stratigraphic classification.
Hydrocarbon »
A family of chemical compounds contail carbon and hydrogen atoms in various combinations,found especially in fossil fuels.
A family of chemical compounds contail carbon and hydrogen atoms in various combinations,found especially in fossil fuels.
I
Incompetent »
Applied to strata,a formation,a rock,or a rock structure not combining sufficient firmness and flexibility to transmit a thrust and to lift a load by bending.
Applied to strata,a formation,a rock,or a rock structure not combining sufficient firmness and flexibility to transmit a thrust and to lift a load by bending.
In Situ »
In the natural or original position.Applied to a rock,soil,or fossil when occuring in the situation in which it was originally formed or deposited.
In the natural or original position.Applied to a rock,soil,or fossil when occuring in the situation in which it was originally formed or deposited.
Intake »
The passage through which fresh air is drawn or forced into a mine or to a section of a mine.
The passage through which fresh air is drawn or forced into a mine or to a section of a mine.
Intermidiete Section »
A term used in belt and chain conveyor network to designate a section of the conveyor frame occupying a positio b/w the head and foot sections.
A term used in belt and chain conveyor network to designate a section of the conveyor frame occupying a positio b/w the head and foot sections.
Ommediete Roof »
The roof strata immediately above the coal bed,requiring support during the excavation of coal.
The roof strata immediately above the coal bed,requiring support during the excavation of coal.
J
Jackleg »
A percussion drill used for drifting or stopping that is mounted on a telescopic leg which has an extension of about 2.5m.
A percussion drill used for drifting or stopping that is mounted on a telescopic leg which has an extension of about 2.5m.
Jackrock »
A caltrop or other manufactured with one or more rounded or sharpened points,which when placed or thrown present at least one point at such an angle that it is peculiar to and designed for use in puncturing or damaging vehicle tyres.
A caltrop or other manufactured with one or more rounded or sharpened points,which when placed or thrown present at least one point at such an angle that it is peculiar to and designed for use in puncturing or damaging vehicle tyres.
Joint »
A divisional plane or surface that divides a rock and along which there has been no visible movement parallel to the plane or surface.
A divisional plane or surface that divides a rock and along which there has been no visible movement parallel to the plane or surface.
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