top coal caving mining method


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(PDF) Technique of top coal caving with vibration

Technique of top coal caving with vibration . ... Based on the model, the load resistance of the hydraulic support with a large mining height for top-coal caving method is determined. With the ...

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 ...

longwall top coal caving Mining -- HOT mining

A further 75%~80% of the additional coal in the seam can be accessed and recovered, significantly improving the total recovery Above Pic,A typical mining planning of longwall top coal caving method Coal Seam Thickness 4.5-7 Meters; Phase3rd 6.5-7 Meters. Depth of Coal 400-700 Meters; currently, the mining depth is 530 Meters

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.5105

LONGWALL TOP COAL CAVING - 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 ...

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%.

Caving mechanisms of loose top-coal in longwall top-coal ...

The top-coal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The top-coal caving mining was estimated to have produced about 0.6 billion metric tons every year, accounts for 18% of underground coal mining in China .The major features of the top-coal caving mining are that a conventional longwall mining with cutting height 2–3 m is performed ...

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 …

Types of Mining Methods | Sell Side Handbook

Sublevel caving is a large-scale mining method, suitable for large ore bodies with a steep dip. The setup is similar to long-hole stoping except loft raises are not required. Also, mining starts at the top of the ore body and progresses downwards in a safe sequence.

Top coal caving mining method - luebeckerbridgeclub.de

3D numerical modeling of longwall mining with topc. Caving mechanism in the topcoalcaving method topcoalcaving production method where a 28 m high longwall face was operated at the floor of the coal seam Undoubtedly, caving of naturally fractured or blasted top coal under gravity is the most critical factor in determination of mining methodrelated parameters such as geometry and dimensions

Block caving: A new mining method arises | …

7/25/2018· Block caving-A new mining method arises Block caving is a new alternative method of developing new mines or extending the operation of open pits. Block caving is an underground hard rock mining method that involves undermining an ore body, allowing it …

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 technological, economic ...

3D numerical modeling of longwall mining with top …

Coal has been produced by means of longwall retreat with the top-coal-caving production method where a 2.8 m high longwall face was operated at the floor of the coal seam . Top-slice coal having a thickness of 5.2 m was caved and produced through windows located at the top of the shields.

Caving mechanisms of loose top-coal in longwall top …

The top-coal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The top-coal caving mining was estimated to have produced about 0.6 billion metric tons every year, accounts for 18% of underground coal mining in China .The major features of the top-coal caving mining are that a conventional longwall mining with cutting height 2–3 m is performed ...

Caving Underground Mining Methods (longwall, …

10/23/2014· Outline of Topic 7: Longwall Longwall in coal Longwall in Hard Rock Sublevel Caving Characteristics of the ore body and mining method Development Production Equipments Used Block Caving Introduction Historical evolution of the method Condition deposit Principles of the method Methodology of block caving Basic issues of geomechanical to the ...

The Principle of Longwall Top Coal Caving (LTCC) - YouTube

4/30/2015· has extensive experience in the design of roof supports for specific mining conditions. Longwall Top Coal Caving (LTCC) roof supports allow mining of seams seams thicker than 6 ...

Inside block caving: the deep mining method of the …

The role of block caving Although the caving mining system was initially used for shallow orebodies, it has recently been applied at depths of 2km underground. According to Suorineni, "caving heights have also increased drastically from about 200m to 500m", creating so-called 'super caves'."There is insufficient experience caving in these environments," he adds, which is a ...

Types of Underground Mining Method Comparison

Methods of mining include stoping, caving, and various methods of working large deposits which, in addition to the method of actually breaking the ore, require elaborate and definite plans of, development of the orebody. The ordinary methods of stoping are too familiar to all for any elaborate discussion, but it has seemed advisable to review ...

Mining Safety of Longwall Top-coal Caving in China

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 recent years.

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 …

Longwall Top Coal Caving Method - LinkedIn SlideShare

2/19/2014· 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 Maximizes Thick Seam …

What is Longwall Top Coal Caving? Due to the inherent operational problems and high costs associated with the multi-slicing longwall method, and the legislative requirement from the central government of a 93% (minimum) recovery rate, LTCC was introduced to the Chinese coal industry in 1982 (based on the European soutirage methods).

Stress analysis of longwall top coal caving | Request PDF

Longwall top coal caving (LTCC) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in China.

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