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 seam.
Apr 12, 2016· This video provides a basic description of the long-wall mining method for extracting coal underground It includes an explanation of the different products/key components of a long-wall mining .
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 45m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m ,
Impacts of Longwall Coal Mining on the Environment in New South Wales Page 3 Longwall mining is a form of underground coal mining that was introduced to Australia and the United States from Europe in the early 1960s It allows mining companies better access and vastly improved recovery rates than older methods of underground mining
Mining safety of longwall top-coal caving in China ,
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% Using standard longwall equipment, annual production .
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 ,
equipment for a Longwall Top Coal Caving face Photo courtesy of Joy Manufacturing Company Pty Ltd 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
A particle-based numerical investigation on longwall top ,
A 3D particle-based numerical approach to simulate the longwall top coal caving (LTCC) process was proposed, which for the first time the effect of continuous support advance and the face-end support were considered The shape of drawing body and top coal boundary and the distribution characteristics of coal loss were analysed
Longwall mining systems are capable of producing significant outputs from a single longwall face – 8 million tones per annum or more When operating correctly the coal is mined in a systematic, relatively continuous and repetitive process which is ideal for strata control and for associated mining operations
Apr 30, 2010· Longwall Top Coal Caving (LTCC) Technical Principle Of Top Caving Rock stress 1st pressure Low stress Stress 2nd pressure Compact peak abrupt drop peak stress Pressure curve of top coalseam Fracture 5600 Coal Broken Coal coal goaf caving 2800 Working Height Front AFC Rear AFC back
Most of the coal mines are in southwest China, which are difficult mining areas that mostly belong to the low, steeply pitching and faults reserved coal seam HOT complete longwall coal mining units represent the ultimate solution for high-production low coal seam longwall mining
Geotechnical Considerations for Longwall Top Coal Caving ,
2011 Underground Coal Operators’ Conference The AusIMM Illawarra Branch 10 – 11 February 2011 29 GEOTECHNICAL CONSIDERATIONS FOR LONGWALL TOP COAL CAVING AT AUSTAR COAL MINE Adrian Moodie1and James Anderson ABSTRACT: Austar Coal Mine has had a long association with difficult strata control conditions associated with depth of mining and a highly jointed/cleated coal ,
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 ,
longwall top coal caving Mining -- HOT mining 浩特矿业
Longwall Top Coal Caving (LTCC) is a special designed longwall mining methodfor very thick seams (thickness is more than 45m) 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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About Us HOT Mining is a leading engineering practice that provides mining, mineral processing and associated infrastructure solutions to the global resources industry For mining projects, HOT offers services from exploration through mine evaluation, feasibility, mine planning, and production to ,
| White Paper: Efficient Mining of High Longwall Seams ,
One of the ways longwall mines achieve or exceed their owners’ expectations is through the use of highly efﬁcient Longwall Top Coal Caving (LTCC) technology production, in combination with the extensive use of automation LTCC remains a seldom used method for mining high seams efﬁciently and ecologically with sustainable use of deposits
Stress analysis of longwall top coal caving - ScienceDirect
Longwall top coal caving (LTCC) is cost effective because only the lower part of a coal seam is cut by a mechanical cutter and the upper part is allowed to cave under gravity, provided the ground conditions are appropriate , , , , , , , , , , , , Chinese experience has highlighted the importance of the stress abutment peak in fracturing the .
Overburden Failure and Ground Pressure Behaviour of ,
10 yielding, coal face spalling, strong deformations of goaf-side entry, and severe ground pressure 11 dynamic events typically occur at the longwall top coal caving longwall fac Based on the Key 12 strata theory an overburden caving model is proposed here to predict the multilayered hard strata 13 behaviour The proposed model together with .
Caving mechanisms of loose top-coal in longwall top-coal ,
Today, the top-coal caving longwall mining is the major mining method for thick seam coal mining in China In the Datong coal district, the annual production is 15 million metric tons per panel The top-coal caving longwall mining has attained outstanding achievements in coal mines with favorable conditions
by longwall and access via the completed opencut highwall The application of Longwall Top Coal Caving in the upper Braymont Seam was flagged as potentially viable for improving recovery of the thicker coal measures in this seam The study investigated all likely infrastructure and capital costs including coal processing and handling Impacts .
Longwall Top Coal Caving The Longwall Top Coal Caving (LTCC) roof support allows mining to a total seam height of more than 10 m (33 ft) by using a longwall shearer to cut the bottom 280 – 3 m (920 – 980 ft) and then caving the top coal behind the roof supports onto a rear AFC This type of longwall is in service
Numerical simulation of the top coal caving process using ,
How to understand the top coal caving process and increase the top coal recovery ratio is one of the urgent problems to resolve for longwall top coal caving technology This paper discusses a new theory and technology of top coal caving with vibration The vibration device is mounted on the shield beam of the top ,
Longwall Installation and Salvaging techniqu - YouTube
Nov 11, 2016· This video shows the longwall installation and salvaging technology used for Moonidih colliery , Top 10 most secluded towns in the United Stat , The Principle of Longwall Top Coal Caving .
Longwall Top Coal Caving 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 .
Feb 19, 2014· LTCC with vibrator The vibrator destroys the arch structure formed during the top coal caving process, which results in the smooth top coal caving process, and in this way the top coal recovery ratio is increased 10 LTCC with vibrator Support Yield beam Vibration device 11 Advantages of LTCC • • • • • High resource recovery
3D numerical modeling of longwall mining with top-coal caving
Caving mechanism in the top-coal-caving method top-coal-caving 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 method-related parameters such as geometry and dimensions .
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 45m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height
A review of cavability evaluation in longwall top coal caving
Longwall Top Coal Caving has been considered as one of the most effective technologies for the extraction of underground thick coal seams A large number of studies on the applicability of Longwall Top Coal Caving into new mine sites have linked the success of its application to the geomechanical understanding of the cavability of the top coal
2014 Coal Operators’ Conference The University of Wollongong 42 12 – 14 February 2014 DEVELOPMENT OF A METHOD FOR LONGWALL TOP COAL CAVEABILITY ASSESSMENT Terry Medhurst1, Rudd Rankine2 and Michael Kelly3 ABSTRACT: Prediction and assessment of caveability for Longwall Top Coal Caving (LTCC) operations remains problematic Whilst operating effectively in ,