Abutment - In coal mining, (1) the

Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face.

Acid deposition or acid rain – Refers loosely to a mixture of wet and dry "deposition" (deposited material) from the atmosphere containing higher than "normal" amount of nitric and sulfuric acids. The precursors or chemical forerunners of acid rain formation result from both natural sources, such as volcanoes and decaying vegetation, and man-made sources, primarily emissions of sulfur and nitrogen oxides resulting from fossil fuel combustion.

Acid mine water - Mine water that contains free sulfuric acid, mainly due to the weathering of iron pyrites.

Active workings - Any place in a mine where miners are normally required to work or travel and which are ventilated and inspected regularly.

Adit - A nearly horizontal passage from the surface by which a mine is entered and dewatered. A blind horizontal opening into a mountain, with only one entrance.

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.

Airway - Any passage through which air is carried. Also known as an air course.

Anemometer - Instrument for measuring air velocity.

Angle of dip - The angle at which strata or mineral deposits are inclined to the horizontal plane.

Angle of draw - In coal mine subsidence, this angle is assumed to bisect the angle between the vertical and the angle of repose of the material and is 20° for flat seams. For dipping seams, the angle of break increases, being 35.8° from the vertical for a 40° dip. The main break occurs over the seam at an angle from the vertical equal to half the dip.

Angle of repose - The maximum angle from horizontal at which a given material will rest on a given surface without 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 opening, leading to stabilization by an arching effect.

Area (of an airway) - Average width multiplied by average height of airway, expressed in square feet.

Auger - A rotary drill that uses a screw device to penetrate, break, and then transport the drilled material (coal).

Auxiliary operations - 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 term that references the angle measured 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 between the meridian and the line.

B

Back - The roof or upper part in any underground mining cavity.

Backfill – Mine waste or rock used to support the roof after coal removal.

Barren - Said of rock or vein material containing no minerals of value, and of strata without coal, or containing coal in seams too thin to be workable.

Barricading - Enclosing part of a mine to prevent inflow of noxious gasses from a mine fire or an explosion.

Barrier - Something that bars or keeps out. Barrier pillars are solid blocks of coal left between two mines or sections of a mine to prevent accidents due to inrushes of water, gas, or from explosions or a mine fire.

Beam - A bar or straight girder used to support a span of roof between two support props or walls.

Beam building - The creation of a strong, inflexible beam by bolting or otherwise fastening together several weaker layers. In coal mining this is the intended basis for roof bolting.

Bearing – A surveying term used to designate direction. The bearing of a line is the acute horizontal angle between the meridian and the line. The meridian is an established line of reference. Azimuths are angles measured clockwise from any meridian.

Bearing plate - A plate used to distribute a given load. In roof bolting, the plate used between the bolt head and the roof.

Bed - A stratum of coal or other sedimentary deposit.

Belt conveyor - A looped belt on which coal or other materials can be carried and which is generally constructed of flame-resistant material or of reinforced rubber or rubber-like substance.

Belt idler - A roller, usually of cylindrical shape, which is supported on a frame and which, in turn, supports or guides a conveyor belt. Idlers are not powered but turn by contact with the moving belt.

Belt take-up - A belt pulley, generally under a conveyor belt and inby the drive pulley, kept under stron

Kết quả (Anh) 1:

Abutment-In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front, that is, the solid abutment coal ahead of the face and the back abutment, that is, the settled packs behind the face.Acid deposition or acid rain-Refers loosely to a mixture of wet and dry "deposition" (deposited material) from the atmosphere containing higher than "normal" amount of nitric and sulfuric acids. The precursors or chemical forerunners of acid rain formation result from both natural sources, such as volcanoes and decaying vegetation, and man-made sources, emissions of nitrogen oxides and sulfur primarily resulting from fossil fuel combustion.Acid mine water Mine water that contains free sulfuric-acid, mainly due to the weathering of iron pyrites.Active workings-Any place in a mine where miners are normally required to work or travel and which are ventilated and inspected regularly.Adit-A nearly horizontal passage from the surface by which a mine is entered and dewatered. A blind horizontal opening into a mountain, with only one entrance.Advance-Mining in the same direction, or the order of sequence; first mining as distinguished from retreat.Air split-The division of a current of air into two or more parts.Airway-Any passage through which air is carried. Also known as an air course.Anemometer-Instrument for measuring air velocity.Angle of dip-The angle at which strata or mineral deposits are inclined to the horizontal plane.Angle of draw-In coal mine subsidence, this angle is assumed to bisect the angle between the vertical and the angle of repose of the material and is 20° for flat seams. For dipping seams, the angle of the break increases, being 35.8° from the vertical for a 40° dip. The main break occurs over the seam at an angle from the vertical equal to half the dip.Angle of repose-The maximum angle from horizontal at which a given material will rest on a given surface without 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 opening, leading to stabilization by an arching effect.Area (of an airway)-Average width any Riemannian metric on by average height of airway, expressed in square feet.Auger-A rotary drill that uses a screw device to penetrate, break, and then transport the drilled material (coal).Auxiliary operations-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 term that references the angle measured clockwise from any meridian (the established line of reference). The bearing is used to designate direction. The bearing of a line is the acute angle between the meridian and the horizontal line.BBack-The roof or upper part in any underground mining Cay.Backfill-Mine waste or rock used to support the roof after coal removal.Barren-Said of rock or vein material containing no minerals of value, and of strata without coal, or containing coal in seams too thin to be workable.Bar­RI­CAD­ing your­self-Enclosing part of a mine to prevent the inflow of noxious gasses from a mine fire or an explosion.Barrier – Something that bars or keeps out. Barrier pillars are solid blocks of coal left between two mines or sections of a mine to prevent inrushes of water due to administering, gas, or from explosions or a mine fire.Beam-A bar or straight girder used to support a span of roof between two support props or walls.Beam building-The creation of a strong, inflexible beam by bolting or otherwise fastening together several weaker layers. In coal mining this is the intended basis for roof bolting.Bearing-A surveying term used to designate direction. The bearing of a line is the acute angle between the meridian and the horizontal line. The meridian is an established line of reference. Azimuths are angles measured clockwise from any meridian.Bearing plate-A plate used to distribute a given load. In roof bolting, the plate used between the bolt head and the roof.Bed-A stratum of coal or other sedimentary deposit.Belt conveyor systems-A looped belt on which coal or other materials can be carried and which is generally constructed of flame-resistant material or of reinforced rubber or rubber-like substance.Belt idler-A roller, usually of cylindrical shape, which is supported on a frame and which, in turn, supports or guides a conveyor belt. Idlers are not powered but turn by contact with the moving belt.Belt take-up-A belt pulley, generally under a conveyor belt and inby the drive pulley, kept under stron

Kết quả (Anh) 2:

Abutment - In coal mining, (1) the weight of the rocks above a narrow Roadway is Transferred to the solid coal along the sides, mà act as abutments of the arch of strata spanning the Roadway; and (2) the weight of the rocks over a longwall face is Transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the Settled behind the face packs.

Acid deposition or acid rain - Refers to a mixture of wet loosely and dry "deposition" (deposited material) from the atmosphere containing Higher than "normal" amount of nitric and sulfuric acids. The chemical precursors or forerunners of acid rain formation result from both Show natural sources, volcanoes and decaying như Vegetation, and man-made sources, emissions of sulfur and nitrogen chính oxides from fossil fuel combustion quả.

Acid mine water - Mine water free chứa sulfuric acid, mainly Due to the weathering of iron pyrites.

Active workings - Any place in a mine where miners are required to work or travel thường and mà ventilated and Inspected regularly.

Adit - A horizontal passage from the surface Nearly mà by a mine is gõ and dewatered. A horizontal blind opening Into a mountain, with only one entrance.

Advance - Mining in the same direction, or order of sequence; as distinguished from the first retreat mining.

Air Split - The division of a current of air Into two or more parts.

Airway - Any passage of air through mà is Carried. Also known as an air course.

Anemometer - Instrument for measuring air velocity.

Angle of dip - The angle at mà strata or mineral deposits are inclined to the horizontal plane.

Angle of draw - Print coal mine subsidence, this angle is assumed to bisect the giữa vertical angle and the angle of Repose of the material and is 20 ° for flat seams. For dipping seams, the angle of break increases, being 35.8 ° from the vertical for a 40 ° dip. The main break over the seam Occurs at an angle from the vertical equal to half the dip.

Angle of Repose - The maximum angle from horizontal at a given material mà sẽ rest on a given surface without sliding or rolling.

Anticline - An Upward fold or arch of rock strata.

aquifer - A water-bearing bed of porous rock, often Do sandstone.

arching - Fracture processes around a mine opening, leading to stabilization by an arching effect.

Area (of an airway) - Average width multiplied by average height of airway, Expressed in square feet.

Auger - A rotary drill a screw device có dùng to Penetrate, break, and then transport the drilled material (coal).

Auxiliary operations - All hoạt trực supportive of but not contributing to mining.

Auxiliary Ventilation - Portion of main ventilating current directed to the entry face of dead end by means clustering of an auxiliary fan and tubing.

Azimuth - A term Surveying the angle measured clockwise có references from any meridian (the established line of reference). The bearing is used to Designated direction. The bearing of a line is the acute angle horizontal meridian and the line giữa.

B

Back - The roof or upper part in any underground mining cavity.

Backfill - Mine waste rock or used to support the roof after removal coal.

Barren - Said of rock or vein material containing no minerals of value, and of strata without coal, coal in seams or containing too thin to be workable.

Barricading - enclosing part of a mine inflow of noxious gasses to Prevent from a mine or an Explosion fire.

Barrier - Something keeps có bars or out. Barrier Pillars are solid blocks of coal left the between two sections of a mine or mines to Prevent accidents Due to inrushes of water, gas, or from a mine explosions or fire.

Beam - A bar or straight girder used to support a roof span of giữa two support walls or props.

Beam building - The creation of a strong, bolting or otherwise Inflexible beam by fastening together vài weaker layers. In coal mining this is the intended basis for roof bolting.

Bearing - A term used to Designated Surveying direction. The bearing of a line is the acute angle horizontal meridian and the line giữa. The meridian is an established line of reference. Azimuths angles are measured clockwise from any meridian.

Bearing plate - A plate used to distribute a given load. In roof bolting, the plate used giữa head and the roof bolt.

Bed - a stratum of coal or other sedimentary deposit.

Belt conveyor - A looped belt or other materials on mà coal and can be Carried Generally constructed of flame mà-resistant Reinforced rubber material or of rubber-like substance or.

Belt idler - A roller, cylindrical shape of Thường, mà supported on a frame and mà, in turn, guides a conveyor belt or hỗ. Idlers are not powered but by contact with the moving turn belt.

Belt take-up - a belt pulley, belt conveyor and a Generally under the drive pulley inby, kept under stron