Longwall mining definition

Longwall mining means a system of mining designed for full pillar extraction that minimizes the possibility of outburst or squeezes and allows total caving of the main roof in the pillar area.
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Longwall mining means a type of underground mining where coal is extracted mechanically from a coalface typically around 250-350m in length. The coalface is generally equipped with a machine, known as a “Shearer”, that cuts the coal and loads it onto an Armoured Face Conveyor (AFC) that runs the length of the coalface. The face is accessed by two parallel roadways that are used for transporting produced coal away from the face as well as materials, services and ventilation. After each pass of the shearer, the face supports are advanced and the strata behind the coalface is allowed to collapse.
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Longwall mining means a mechanised or manual method in which long open voids (slots) left after ore extraction are left to subside and get filled with surrounding rock;
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Examples of Longwall mining in a sentence

  • Longwall mining refers to extracting coal from long rectangular blocks of coal seams.

  • Longwall mining production is often limited below the capacity of the equipment because of the large amount of methane that is quickly released at the face.

  • When the reporting verb is in the present, present perfect or future tense, there is no change in the tense of the reported statement.Ex: 1.

  • Longwall mining is performed in areas where 100% extraction is possible utilizing a single longwall face that is typically 1,200 feet in width and up to 20,000 feet in length.

  • Longwall mining was discounted due to the faulted and dipping manto structure and high initial capital cost.

  • Longwall mining production of the “B” Seam began in 1992; production from the Mine increased substantially as a result.

  • Longwall mining poses a grave threat to the integrity of rivers and ecological communities in National Parks in the Western Coalfield, while BHP Billiton’s Caroona project in the Gunnedah Basin, currently in the exploration stage, threatens multiple levels of aquifers under some of Australia’s richest agricultural land.It is not disputed by any authority that subsidence due to longwall mining can cause deformation of ground surfaces as well as cracking of valley floors and creeklines.

  • Longwall mining is a form of underground coal mining where ‘panels’ of coal are mined side by side separated by narrow ‘pillars’ of rock that act as supports.

  • Longwall mining equipment shall be provided with cable-handling and support systems that are constructed, installed and maintained to minimize the possibility of miners contacting the cables and to protect the high-voltage cables from damage.

  • Longwall mining introduces methane into the mine through collapse of the roof and floor or where conduits within the subsurface provide a transport pathway for methane into the mine.

Related to Longwall mining

  • Surface mining means mining by removing the overburden lying above the natural deposits and excavating directly from the natural deposits exposed, or by excavating directly from deposits lying exposed in their natural state and shall include dredge operations conducted in or on natural waterways or artificially created waterways within the state.

  • Water Main means (subject to Section 219(2) of the 1991 Act) any pipe, not being a pipe for the time being vested in a person other than the water undertaker, which is used or to be used by a water undertaker or licensed water supplier for the purpose of making a general supply of water available to customers or potential customers of the undertaker or supplier, as distinct from for the purpose of providing a supply to particular customers;

  • Mine means to carry on an operation with a view to, or for the purpose of—

  • Underground mining means all methods of mining other than surface mining.

  • Flowgate means a representative modeling of facilities or groups of facilities that may act as potential constraint points.

  • Quarry means a pit, excavation, or other place made by any means for the purpose of removing Construction Materials or a site identified for such purposes, and includes works, machinery, plants, and buildings below or above ground belonging to or used in connection with a Quarry.

  • Sailboat means the same as that term is defined in Section 73-18-2.

  • Forest means an area of land defined by the minimum values for area size, tree crown cover or an equivalent stocking level, and potential tree height at maturity at the place of growth of the trees as specified for each Member State in Annex II. It includes areas with trees, including groups of growing, young, natural trees, or plantations that have yet to reach the minimum values for tree crown cover or an equivalent stocking level or minimum tree height as specified in Annex II, including any area that normally forms part of the forest area but on which there are temporarily no trees as a result of human intervention, such as harvesting, or as a result of natural causes, but which area can be expected to revert to forest;

  • Dewatering means the removal of water for construction activity. It can be a discharge of appropriated surface or groundwater to dry and/or solidify a construction site. It may require Minnesota Department of Natural Resources permits to be appropriated and if contaminated may require other MPCA permits to be discharged.

  • foreshore , in relation to a port, means the area between the high-water mark and the low-water mark relating to that port;

  • Bedrock means continuous rock that underlies the soil or is exposed at the surface. Bedrock is generally considered impervious, but if fractured or deteriorated, it may allow effluent to pass through without adequate treatment.

  • Shoreline means the upper reaches of the wash of the waves, other than storm and seismic waves, at high tide during the season of the year in which the highest wash of the waves occurs, usually evidenced by the edge of vegetation growth, or the upper limit of debris left by the wash of the waves.

  • Mining means the mining, extracting, producing, beneficiating, handling, milling or other processing of Products.

  • Water Line The water line is the single lateral water service line from the point of the water utility’s connection to the point of the water meter or main shut off line inside the home. The water line also includes well water lines, excluding those exceeding five feet under the surface level of the yard.

  • Highwall means a vertical or nearly vertical face in solid rock or a slope of consolidated or unconsolidated material that exceeds 3:1.

  • Waterway means any body of water.

  • cogeneration means the simultaneous generation in one process of thermal energy and electrical or mechanical energy;

  • Navigable waters ’ means the waters of the United States, including the territorial sea;

  • Shorelines means all of the water areas of the state, including reservoirs, and their associated shorelands, together with the lands underlying them; except (i) shorelines of statewide significance; (ii) shorelines on segments of streams upstream of a point where the mean annual flow is twenty cubic feet per second or less and the wetlands associated with such upstream segments; and (iii) shorelines on lakes less than twenty acres in size and wetlands associated with such small lakes.

  • Pipeline means any pipe, pipes, or pipelines used for the intrastate transportation or transmission of any solid, liquid, or gaseous substance, except water.

  • Cropland means land used for the production of adapted crops for harvest, alone or in a rotation with grasses and legumes, and includes row crops, small grain crops, hay crops, nursery crops, orchard crops, and other similar specialty crops.

  • CPN is a Common Channel Interoffice Signaling ("CCIS") parameter which refers to the number transmitted through a network identifying the calling party.

  • Cyberbullying means any form of communication by electronic act that is sent with the purpose to:

  • Hazing means committing an act against a student, or coercing a student into committing an act, that creates a substantial risk of harm to a person, in order for the student to be initiated into or affiliated with a student organization, or for any other purpose. The term hazing includes, but is not limited to:

  • Refinery means a facility used to produce motor fuel from crude oil, unfinished oils, natural gas liquids, or other hydrocarbons and from which motor fuel may be removed by pipeline, by marine vessel, or at a rack.

  • Surface waters means all waters of the state as defined in G.S. 143-212 except underground waters