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Top Coal Caving Mining Method

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Systems of Mining ore coal slicing caving method

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.

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Numerical modeling of longwall top coal caving method at

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

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Longwall Top Coal Caving LTCC Mining Technology

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.

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Coal mining Choosing a mining method Britannica

Coal mining Choosing a mining method Britannica

Coal mining - Coal mining - Choosing a mining method The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam depends on many

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Stress analysis of longwall top coal caving ScienceDirect

Stress analysis of longwall top coal caving ScienceDirect

Top coal caving is an economical underground mining method, which has recently been introduced, modified and practiced in the underground coal mines of China. The method and its consecutive modifications can be linked to the original method of soutirage mining

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Longwall Top Coal Caving Mechanisms in the Fractured Thick

Longwall Top Coal Caving Mechanisms in the Fractured Thick

Aug 08, 2020 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 FDMDFN model enabled the influence of the preexisting fracture, stress redistribution, stress rotation, caving material compaction, and periodic rupture of roof ...

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Top Coal Movement Law of Dynamic Group Caving Method

Top Coal Movement Law of Dynamic Group Caving Method

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 ...

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Mining safety of longwall topcoal caving in China

Mining safety of longwall topcoal caving in China

articleosti20020940, 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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Top Coal Caving Longwall underground COAL

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 costtonne, there has been ...

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Longwall Top Coal Caving Top Coal Caving Top Coal Caving

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.

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Longwall Top Coal Caving at the Broadmeadow Mine

Longwall Top Coal Caving at the Broadmeadow Mine

The adjacent open-cut mine has been mining the full seam section for more than 30 years, investigations and evaluations were made into the Top Coal Caving method and its suitability for the operation. Longwall Top Coal Caving LTCC was introduced in 2012.

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Longwall Top Coal Caving Introduction underground COAL

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. It enables an increased recovery for only an incremental additional cost.

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SMERE Longwall Top Coal Caving Apps on Google Play

SMERE Longwall Top Coal Caving Apps on Google Play

Apr 13, 2020 This app has been developed for the students of Minerals and Energy Resources Engineering MERE subjects at the University of New South Wales UNSW, Australia. It is intended to provide an introduction to the longwall top coal caving LTCC mining method through an interactive simulation. A 360-degree view is provided of the cutting sequence at a hypothetical LTCC face.

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Longwall Top Coal Caving LTCC technology Yancoal

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 for an operation.

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3D numerical modeling of longwall mining with topcoal caving

3D numerical modeling of longwall mining with topcoal 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

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Theoretical description of drawing body shape in an

Theoretical description of drawing body shape in an

Dec 11, 2019 Longwall top coal caving LTCC mining is an efficient method for extracting thick coal seams, and, with the development of high-performance equipment, it has become widely used in inclined and steeply inclined seams.

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Caving mechanisms of loose topcoal in longwall topcoal

Caving mechanisms of loose topcoal in longwall topcoal

In the past two decades, the top-coal caving mining method has been rapidly developed in China. It has become the main method for mining in the thick coal seams. The core topics of research in the top-coal caving mining are the mechanisms of top-coal caving and improvement of

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Coal Zoom Longwall TopCoal Caving A Productive and

Coal Zoom Longwall TopCoal 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

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Ultrathick Seam Longwall Mining in China Coal Age

Ultrathick Seam Longwall Mining in China Coal Age

Oct 24, 2013 In top coal caving mining, the bottom 2.5-4 m 8.1-13.1 ft of the seam is extracted by the conventional longwall mining method and the remaining roof top coal is naturally caved behind the shield. In this method, there are two armored face conveyors AFCs at the longwall face, the front one located in front of the shield legs is operated ...

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Numerical Analysis of Top Coal Recovery Ratio by using

Numerical Analysis of Top Coal Recovery Ratio by using

Caving mechanisms of loose top-coal in longwall top-coal caving mining method. International Journal of Rock Mechanics and Mining Sciences, 71, 160

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PDF Numerical Investigation of Top Coal Drawing

PDF Numerical Investigation of Top Coal Drawing

Numerical Investigation of Top Coal Drawing Evolution in Longwall Top Coal Caving by the Coupled Finite Difference Method-Discrete Element Method January 2021 Energies 141219

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Numerical Analysis of Top Coal Recovery Ratio by using

Numerical 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. ...

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Ultrathick Seam Longwall Mining in China Coal Age

Ultrathick Seam Longwall Mining in China Coal Age

Oct 24, 2013 In top coal caving mining, the bottom 2.5-4 m 8.1-13.1 ft of the seam is extracted by the conventional longwall mining method and the remaining roof

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