top coal caving mining method

  • Longwall Top Coal Caving (LTCC) Mining Technology

    Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.Longwall Top Coal Caving Introduction underground COAL,Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.

  • Longwall Top Coal Caving (LTCC) technology Yancoal

    Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for an operation.MODERN MINING TECHNOLOGY FOR COAL EXTRACTION,METHOD OF EXTRACTION Opencast Underground 1. Conventional Shovel Dumper 2. Dragline 3.

  • Systems of Mining ore, coal, slicing, caving, method

    The longwall, the pillar robbing in both room-and pillar and bord-and-pillar methods of mining coal are essentially the same in principle as top slicing. The principal difference is that a single slice only is worked in these methods when applied to coal mining. There are two modifications: top slicing by drifts and top slicing by rooms.Longwall Top Coal Caving,Top Coal Caving,Top Coal Caving,Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.

  • Longwall Top Coal Caving (LTCC) technology Yancoal

    Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology to Australia at its Austar mine in 2006. Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns forTop Coal Movement Law of Dynamic Group Caving Method in,Due to the unbalanced top coal drawing process, the recovery ratio is low, and the equipment stability is poor in the longwall top coal caving mining (LTCC) with an inclined seam. Aimed at these problems, this paper proposes the dynamic group caving method (DGCM). The basic procedure is that when the drawn volume of top coal from a support reaches about half, the next support begins drawing

  • Longwall Top Coal Caving Method SlideShare

    Feb 19, 2014· LTCC • Longwall Top coal Caving (LTCC) is a method of extraction for underground mining of thick seams. • It uses a longwall set-up and natural forces to aid in the winning of coal. 4.Top Coal Caving Longwall underground COAL,A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site. Despite the fact that there are numerous coal seams in Australia which are thick enough for LTCC to be used to increase recoveries, potentially at a reduced cost/tonne, there has been

  • A new cavability assessment criterion for Longwall Top

    Dec 01, 2010· Longwall Top Coal Caving (LTCC) is a modified longwall mining method for efficient extraction of the thick coal seams. The major difference between LTCC and the traditional longwall method is the extraction of the caved coal from behind the shields as well as the sheared face ().The method has been widely implemented by the Chinese coal industry with numerous modifications and Systems of Mining ore, coal, slicing, caving, method,Systems of Mining ore, coal, slicing, caving, method, top, system, explosives, pillars and cent The principal difference is that a single slice only is worked in these methods when applied to coal mining. There are two modifications: top slicing by drifts and top slicing by rooms.

  • MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

    1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.A Brief Comparison of Longwall Methods Used at Mining ,The Longwall Top Coal Caving Method In Turkey, the LTCC method has been applying for many years. It is based on the 'Soutirage' longwall caving method originally developed in the French coal mining industry. 142 . The 19th International Mining Congress and Fair of Turkey, IMCET2005, İzmir, Turkey, June 09-12, 2005

  • Numerical modeling of longwall top coal caving method at

    The preferred mining method for these thick coal seams is the Longwall Top Coal Caving (LTCC). The connection of both the top coal caving and its compactness are still rare; therefore, the capability of top coal caving mechanism is the most significant factor in Coal Zoom Longwall Top-Coal Caving: A Productive and,Dec 04, 2018· Longwall Top-Coal Caving: A Productive and Efficient Alternative . December 4, 2018 In the right conditions, longwall mining is one of the safest, most productive and most efficient ways to produce coal. This is owed in part to the high degree of automation employed by modern longwall operations, which keeps shearers and roof supports advancing smoothly and people far from the

  • Caterpillar to Supply Two Complete Longwall Top Coal

    The longwall top coal caving (LTCC) mining method to be employed at the Eynez East underground coal mine is a special type of longwall mining applicable to seams thicker than 6 meters (20 feet). Conventional longwall equipment has not yet been designed to operate successfully in seams thicker than approximately 6 meters (20 feet) mining height.3D numerical modeling of longwall mining with top-coal caving,ARTICLE IN PRESS Caving mechanism in the top-coal-caving methodUndoubtedly, caving of naturally fractured or blasted top coal under gravity is the most critical factor in determination of mining method-related parameters such as geometry and dimensions of

  • Longwall Top Coal Caving,Top Coal Caving,Top Coal Caving

    Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.Numerical modeling of longwall top coal caving method at,The top-coal caving mining method, developed steadily in the past two decades, has become the main method for thick seam coal mining in China. In recent years, the core research areas in the top

  • Top Coal Caving Longwall underground COAL

    A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site. Despite the fact that there are numerous coal seams in Australia which are thick enough for LTCC to be used to increase recoveries, potentially at a reduced cost/tonne, there has beenNumerical modeling of longwall top coal caving method at,The preferred mining method for these thick coal seams is the Longwall Top Coal Caving (LTCC). The connection of both the top coal caving and its compactness are still rare; therefore, the capability of top coal caving mechanism is the most significant factor in

  • Mining safety of longwall top-coal caving in China

    @article{osti_20020940, title = {Mining safety of longwall top-coal caving in China}, author = {Wu, J and Qin, Y and Zhai, M}, abstractNote = {Longwall top-coal caving technology has developed rapidly in China, in recent years. The application of longwall top-coal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 50%.Key technologies and equipment for a fully mechanized top,mining height for top-coal caving method is determined. With the analysis, the movement characteristics of the top coal and above strata are evaluated during top-coal caving operation at the coal face with a large mining height.

  • MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

    1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.Stress analysis of longwall top coal caving Request PDF,The longwall top coal caving (LTCC) is an efficient mining method to specifically extract thick or ultra-thick coal seams due to its good adaptability with respect to the large variations of coal

  • Caterpillar to Supply Two Complete Longwall Top Coal

    The longwall top coal caving (LTCC) mining method to be employed at the Eynez East underground coal mine is a special type of longwall mining applicable to seams thicker than 6 meters (20 feet). Conventional longwall equipment has not yet been designed to operate successfully in seams thicker than approximately 6 meters (20 feet) mining height.A Brief Comparison of Longwall Methods Used at Mining ,The Longwall Top Coal Caving Method In Turkey, the LTCC method has been applying for many years. It is based on the 'Soutirage' longwall caving method originally developed in the French coal mining industry. 142 . The 19th International Mining Congress and Fair of Turkey, IMCET2005, İzmir, Turkey, June 09-12, 2005

  • Overburden Failure and Ground Pressure Behaviour of

    The average coal seam thickness was approximately 15.3 m. Fully mechanized top-coal 89 caving mining method was employed. The coal was cut to a height of 3.9 m while the top coal caving 90 height averaged 11.4 m. ZF/15000/27.5/42 hydraulic supports were used. No.5404 and No.5105Numerical Analysis of Top Coal Recovery Ratio by using,This paper discusses numerical modeling of top coal caving mining method and studies the coal recovery ratio by using discrete element method. In the modeling consequences, the total top coal recovery ratio was computed to be 83.9% when the top coal thickness was three times the cutting height with the drawing interval of 0.8m respectively.

  • Thick Seam Mining Methods Longwall Top Coal Caving

    Thick Seam Mining Methods Longwall Top Coal Caving Contact us. For more information, contact Dr Chengguo Zhang. E: [email protected] Australia has very large thick seam coal resources. As a result, there has been ongoing research conducted by the School and others into suitable mining methods that are capable of safe, efficient andLongwall Top Coal Caving Application Assessment in Australia,The method employs both coal cutting of the lower portion of the coal seam accompanied by caving and reclamation of the ‘top’ coal. Coal is first cut from the longwall face using a conventional shearer and AFC arrangement working under hydraulic face supports that incorporate a rear coal conveyor and cantilever flipper arrangement.