longwall method coal exploitation minière

  • Longwall Mining Overview Introduction underground COAL

    LONGWALL MINING Overview. In the method of secondary extraction known as longwall mining a relatively long mining face (typically in the range 100 to 300m but may be longer) is created by driving a roadway at right angles between two roadways that form the sides of the longwall block, with one rib of this new roadway forming the longwall face.

  • Fact sheet Subsidence from longwall coal mining

    Longwall mining is currently the main method of underground coal mining in Australia. It is safer and more efficient than other underground coal mining methods, and it involves extraction of large rectangular panels of coal by progressively shaving slices of coal from the longwall face, under the protection of hydraulic roof supports (Figure 1).

  • Latest Developments in Longwall Mining Technology

    supplying special shields for the longwall top coal caving method (LTCC), where extremely thick seams are being mined. This method utilizes a second AFC behind the shields to take the coal on top of the longwall outside of the face. Several such systems have been supplied and successfully installed in

  • A Brief Comparison of Longwall Methods Used at Mining of

    carried out employing longwall methods. According to Hartman and Mutmansky (2002), longwall mining is an exploitation method used in flat-lying and tabular deposits, where a long face is established to extract the mineral. In coal longwall mining, large blocks of coal seam (about 300 m wide and 2 to 3 km long) are developed by driving headings,

  • Coal Exploration and Mining

    two basic methods of extracting coal, i.e. surface mining and underground mining, are introduced. Firstly, two main methods—strip mining and open-pit mining—of surface mining are discussed. In underground mining, room and pillar, shortwall, and longwall mining methods are introduced. Finally, a brief prospect for coal exploration and mining

  • Introduction to Longwall Mining and Subsidence ver2

    The longwall face is indicated by the number 8 in the diagram. Fig. 1.1 Cutaway View of a Typical Longwall Mine In longwall mining, a panel of coal, typically around 150 to 300 metres wide, 1000 to 3500 metres long and 2 to 5 metres thick, is totally removed by longwall shearing machinery, which travels back and forth across the coalface. A

  • INTRODUCTION TO A METHODOLOGY OF COST MANAGEMENT

    methodology of cost management in the context of longwall life cycle. The present cost accounts were an inspiration for examining the methodology; notably the most useful accounts for hard coal mining are: the cost account in the longwall life cycle, an activity-based cost account, a target-cost account, and a continuous-improvement cost

  • Published in: European Scientific Journal, ESJ · 2013Authors: Izabela JonekkowalskaAffiliation: Silesian University of Technology
  • NUMERICAL MODELING OF OPEN PIT (OP) TO UNDERGROUND

    Generally, after any mineral exploitation, the breach of the structure of the rock mass will occur with dis-tinctive features, depending on the method of under-ground exploitation (Fig. 1 and Fig. 2). In the case of longwall methods for coal exploitation, there are

  • CHAPTER V MINING METHODS AND COAL PROCESSING

    MINING METHODS AND COAL PROCESSING TECHNOLOGY 5.1 INTRODUCTION Mineral exploitation in which all extractions are carried out beneath the earth’s surface is termed as underground mining. Underground mining methods are employed when the depth of the deposit, the stripping ratio of overburden to ore (coal or stone), or both become

  • (PDF) COAL MINING METHODS researchgate.net

    Geologic conditions play a key role in selecting the method. Coal is friable and loose in its structure. The methods of mining of coal varies from deposit to deposit. This report highlights the

  • INTRODUCTION TO A METHODOLOGY OF COST MANAGEMENT IN

    methodology of cost management in the context of longwall life cycle. The present cost accounts were an inspiration for examining the methodology; notably the most useful accounts for hard coal mining are: the cost account in the longwall life cycle, an activity-based cost account, a target-cost account, and a continuous-improvement cost

  • Published in: European Scientific Journal, ESJ · 2013Authors: Izabela JonekkowalskaAffiliation: Silesian University of Technology
  • NUMERICAL MODELING OF OPEN PIT (OP) TO UNDERGROUND

    Generally, after any mineral exploitation, the breach of the structure of the rock mass will occur with dis-tinctive features, depending on the method of under-ground exploitation (Fig. 1 and Fig. 2). In the case of longwall methods for coal exploitation, there are three zones: caved zone, fractured zone and sagging zone,

  • Longwall Mining Coal Education

    Longwall miners extract "panels" rectangular blocks of coal as wide as the mining machinery and as long as 12,000 feet (3,650 meters). Massive shearers cut coal from a wall face, which falls onto a conveyor belt for removal. As a longwall miner advances along a panel, the roof behind the miner's path is allowed to collapse.

  • Calculation of Subsidence for Room and Pillar and Longwall

    2011 Underground Coal Operators’ Conference The AusIMM Illawarra Branch 10 11 February 2011 83 CALCULATION OF SUBSIDENCE FOR ROOM AND PILLAR AND LONGWALL PANELS Anton Sroka1,2, Krzysztof Tajdus2 and Axel Preusse3 ABSTRACT: A European method of surface subsidence calculation for partial room and pillar and longwall panel mining of coal

  • Formation of methane hazard in longwall coal mines with

    Considering above, the length and advance rate of the longwall have a substantial influence on the volume of de-stressed deposit, being degasified during coal exploitation in the underworked and overworked seams. In the further part of the analysis, roof management in longwall exploitation was referred to caving method.

  • Geological and geotechnical aspects of underground coal

    About one quarter of the coal produced in Australia is by underground mining methods. The most commonly used underground coal mining methods in Australia are longwall

  • Coal Mining Methods emfi.mines.edu

    Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal underground, with room-and-pillar being the traditional method in the United States. Both methods are well suited to extracting the relatively flat coalbeds (or coal seams) typical of the United States. Although

  • Underground Mining Methods and Equipment

    section describes underground mining equipment, with particular focus on excavation machinery such as boomheaders, coal cutters, continuous miners and shearers. 1. Underground Mining Methods 1.1. Classification of Underground Mining Methods Mineral production in which all extracting operations are conducted beneath the ground

  • Coal mining Wikipedia

    There are six principal methods of underground mining: Longwall mining accounts for about 50 percent of underground production. The longwall shearer has a face of 1,000 feet (300 m) or more. It is a sophisticated machine with a rotating drum that moves mechanically back and forth across a wide coal seam.

  • Room and pillar mining Wikipedia

    Room and pillar mining was one of the earliest methods used, although with significantly more man-power. The room and pillar system is used in mining coal, gypsum, iron, and uranium ores, particularly when found as manto or blanket deposits,

  • Geophysical Evaluation of Effectiveness of Blasting for

    Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam ŁUKASZ WOJTECKI, 1 PETR KONICEK,2 MACIEJ J. MENDECKI,3 IWONA GOłDA,4 and WACłAW M. ZUBEREK 3 Abstract—Deep longwall mining of coal seams is made in the

  • Evaluating pressure-relief mining performances based on

    The design of underground gas venthole is based on the gas flow and enrichment behaviors, which is shown in Fig. 3.Downward boreholes, from air outlet roadways or some other adjacent roadways, are used to extract the gas in pressure-relief floor strata and prevent the gas flowing upward.

  • Design of a Powered Support System in Enugu Coal Mine

    order to mine more coal that is by “longwall method.” This is the most popular method of mining coal deposits (Wikipedia, 2009). Many miners worked together to take the coal seam at the same time. They built stone walls and used timber posts or props to hold up the roof as supports (Nwude and Mallo, 2003).

  • NSW Mining Methods NSW Mining

    Underground mining accounts for 60% of world coal production, but is less common in NSW, making up around 35% of raw coal production. This method is also used to mine metallic minerals like gold and copper. The two main types of underground mining in NSW are bord-and-pillar and longwall mining.

  • A study of mining-induced seismicity in Czech mines with

    @article{osti_20939599, title = {A study of mining-induced seismicity in Czech mines with longwall coal exploitation}, author = {Holub, K.}, abstractNote = {A review is performed for the data of local and regional seismographical networks installed in mines of the Ostrava-Karvina Coal Basin (Czech Republic), where underground anthracite mining is carried out and dynamic events occur in the

  • A study of mining-induced seismicity in Czech mines with

    Abstract. A review is performed for the data of local and regional seismographical networks installed in mines of the Ostrava-Karviná Coal Basin (Czech Republic), where underground anthracite mining is carried out and dynamic events occur in the form of rockbursts.

  • Appendix C

    The Longwall method was selected for its superior resource recovery and productivity rates, its flexibility to handle a range of mining heights, its good control over spontaneous combustion and its wide utilisation in the Australian underground coal mining industry. The longwall was designed using 250m wide faces with dual heading gateroads and 25m

  • A MODEL OF ROCK MASS FRACTURING AHEAD OF THE LONGWALL

    A MODEL OF ROCK MASS FRACTURING AHEAD OF THE LONGWALL FACE AS A CONSEQUENCE OF INTENSITY OF EXPLOITATION Jan DRZEWIECKI * and Janusz MAKÓWKA Central Mining Institute, Plac Gwarkow 1, 40-166 Katowice, Poland *Corresponding author‘s e-mail: [email protected] (Received July 2012, accepted October 2012) ABSTRACT In Czech and Polish underground hard coal mines of the Upper Silesian Coal

  • methods of underground mining in coal mines

    Appendix E: Coal Mining and Processing Methods Coal Underground mining is usually by the room-and-pillar mining or longwall mining method . Even in mines where the longwall method is the principal extraction method, the development of the mine and the longwall panels is accomplished by room-and-pillar continuous mining. Contact Supplier

  • Predicting Methane Concentration in Longwall Regions Using

    hard coal exploitation. When reaching certain concentration levels, this gas becomes flammable and explosive [1,3,7]. Methane explosion or ignition in an underground mine heading poses a great risk, which has been observed to have increased in recent years. This results from the exploitation of coal