• Types of Underground Mining Method Comparison

    2017-3-16 · Underhand Stoping Mining Method. stoping refers to the working of a flat orebody or a flat section of an orebody just as coal is mined from a flat coal seam. That is a slice is worked in a horizontal direction. A timber mat may be used as in top slicing. Sublevel caving is adaptable to massive deposits or wide veins in which the ore

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  • 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. It enables an increased recovery for only an incremental

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  • 15. Longwall and caving mining methods

    2018-1-30 · 15.3 Longwallcoal mining 15.3.5 Roadway formation and support-Single roadways were often used for an advancing longwall method with packs to carry loads on the waste side or between rib side and roadway.-Retreat method of longwall coal mining has become almost universal where multiple entries are used widly.

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  • Top Coal Movement Law of Dynamic Group Caving Method

    2020-7-7 · Longwall top coal caving mining (LTCC) is an efficient mining method to extract thick and extra-thick seams. As shown in Fig. 1 the bottom coal is extracted by the shearer and transported out of the panel by the front armored face conveyor (AFC) while the loose top coal that fractured by the mining stress and repeated force of support is drawn from the support opening (SO) and transferred

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  • Viewpoint Mining MagazineLongwall Top-Coal Caving

    Fortunately there is a method that can allow a longwall system to recover all the coal in a high seam safely and efficiently without the geological and ecological concerns caused by partially mining the seam. The Longwall Top-Coal Caving (LTCC) method makes use of a second conveyor and the natural force of gravity to recover coal above the

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  • Systems of Miningore coal slicing caving method

    2011-11-15 · Caving System.—A method of mining in which the support of a great block of ore being removed it is allowed to cave or fall and in falling is broken sufficiently to be handled the overlying strata subsides as the ore is withdrawn. Two important variations are Top slicing and cover caving Top slicing combined with ore caving.

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  • 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

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  • Longwall Top Coal Caving Introduction underground COAL

    Longwall Top Coal Caving. 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

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  • Mining safety of longwall top-coal caving in China

    1999-7-1 ·  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 .

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  • Quantitative Evaluation of Top Coal Caving Methods at the

    2021-4-10 · Adopting an effective top coal caving method is the key to enhancing coal recovery and reducing gangue content for the fully mechanized top coal caving working face with extra-thick coal seams. In this study the movement of coal particles generated during top coal caving is considered to follow a normal distribution. Then the caving body and coal-rock settlement along the working face

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  • 15. Longwall and caving mining methods

    2018-1-30 · 15.3 Longwallcoal mining 15.3.5 Roadway formation and support-Single roadways were often used for an advancing longwall method with packs to carry loads on the waste side or between rib side and roadway.-Retreat method of longwall coal mining has become almost universal where multiple entries are used widly.

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  • Viewpoint Mining MagazineLongwall Top-Coal Caving

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  • Quantitative Evaluation of Top Coal Caving Methods at the

    2021-4-10 · Adopting an effective top coal caving method is the key to enhancing coal recovery and reducing gangue content for the fully mechanized top coal caving working face with extra-thick coal seams. In this study the movement of coal particles generated during top coal caving is considered to follow a normal distribution. Then the caving body and coal-rock settlement along the working face

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  • Mining Safety of Longwall Top-coal Caving in China

    2020-11-4 · 53 Mining Safety of Longwall Top-coal Caving in China Jian Wu 1 Yueping Qin 1 and Minghua Zhai1 1China Univ. of Mining and Technology 011# Xueyuan Road Haidian Dist Beijing 100083 P.R. of China 2Zhangji Coal Mine Xuzhou Mining Bureau Xuzhou 221147 Jiangsu Province P.R of China ABSTRACT Longwall top-coal caving technology has developed rapidly in China in

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  • Mining safety of longwall top-coal caving in China

    1999-7-1 ·  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 .

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  • Mining safety of longwall top-coal caving in China

    1999-7-1 ·  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 .

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  • FILLING MINING METHOD FOR FULLY-MECHANIZED TOP COAL CAVING

    A mining method of alternate coal caving and filling is provided to complete the filling mining of the top coal caving working face. In this way the roof is effectively controlled ground subsidence is reduced and advantages such as safety and high efficiency are available.

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  • Mining Safety of Longwall Top-coal Caving in China

    2020-11-4 · 53 Mining Safety of Longwall Top-coal Caving in China Jian Wu 1 Yueping Qin 1 and Minghua Zhai1 1China Univ. of Mining and Technology 011# Xueyuan Road Haidian Dist Beijing 100083 P.R. of China 2Zhangji Coal Mine Xuzhou Mining Bureau Xuzhou 221147 Jiangsu Province P.R of China ABSTRACT Longwall top-coal caving technology has developed rapidly in China in

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  • longwall top coal caving Mining -- HOT mining

    Longwall Top Coal Caving (LTCC) is a special designed longwall mining methodfor very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventiona l" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height. It enables an increased recovery for only an incremental

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  • FILLING MINING METHOD FOR FULLY-MECHANIZED TOP COAL CAVING

    A mining method of alternate coal caving and filling is provided to complete the filling mining of the top coal caving working face. In this way the roof is effectively controlled ground subsidence is reduced and advantages such as safety and high efficiency are available.

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  • Longwall Top Coal Caving Mechanisms in the Fractured Thick

    In this study the finite difference method (FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwall top coal caving (LTCC) behaviors. The integrated FDM–DFN model enabled the influence of the preexisting fracture stress redistribution stress rotation caving material compaction and periodic rupture of roof

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  • Mining safety of longwall top-coal caving in China

    1999-7-1 ·  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 .

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  • Three-dimensional experimental study of loose top-coal

    2017-2-11 · Longwall top-coal caving (LTCC) mining technology is a pro-ductive and economical method to extract thick coal seams and thus is widely used in many coal mines in China (Wang 2009 Wang et al. 2014). Although some hypotheses on top-coal draw-

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  • TOP CAVINGMining Science and Technology

    TOP CAVING . Overview 0 Comment. Longwall Topcoal Caving (TCC) 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. With this method of extraction only a single longwall is developed at the foot of the seam. The control of the roof layers at the face is by

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  • Mining Safety of Longwall Top-coal Caving in China

    2020-11-4 · 53 Mining Safety of Longwall Top-coal Caving in China Jian Wu 1 Yueping Qin 1 and Minghua Zhai1 1China Univ. of Mining and Technology 011# Xueyuan Road Haidian Dist Beijing 100083 P.R. of China 2Zhangji Coal Mine Xuzhou Mining Bureau Xuzhou 221147 Jiangsu Province P.R of China ABSTRACT Longwall top-coal caving technology has developed rapidly in China in

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  • Force chains in top coal caving miningScienceDirect

    2020-3-1 · Top coal caving mining destroyed the equilibrium of the initial force chain network. Force chains developed and grew in the overlying strata in an arch-like form over the mining area which transmitted the overlying loads to the front of the coal seam with advancing the working face. After mining the intensity of force chain dropped promptly

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  • Systems of Miningore coal slicing caving method

    2011-11-15 · Caving System.—A method of mining in which the support of a great block of ore being removed it is allowed to cave or fall and in falling is broken sufficiently to be handled the overlying strata subsides as the ore is withdrawn. Two important variations are Top slicing and cover caving Top slicing combined with ore caving.

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