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Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than ) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.
Nov 01, 2017· Longwall Top Coal Caving was initially developed in the former Soviet Union and France in the 1950s and 1960s. It was then applied in the former Yugoslavia, Hungary, Romania, the former Czechoslovakia and Turkey,, .The ''Soutirage'' method which was developed in France in the 1960s is considered as the original form of LTCC .The system includes a conventional longwall face .
article{osti_, title = {Mining safety of longwall topcoal caving in China}, author = {Wu, J and Qin, Y and Zhai, M}, abstractNote = {Longwall topcoal caving technology has developed rapidly in China, in recent years. The application of longwall topcoal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 50%.
LONGWALL TOP COAL CAVING DESCRIPTION . Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to extract coal from behind the powered supports that would otherwise be left unrecovered in thick seam environments. The major
In longwall top coal caving (LTCC), fractures in the top coal are the most significant factors to consider when assessing top coal cavability. Fractures in the floor have an adverse impact on longwall mining practice and play a significant role in safe mining above confined aquifers.
Feb 01, 2005· Coal has been produced by means of longwall retreat with the topcoalcaving production method where a m high longwall face was operated at the floor of the coal seam . Topslice coal having a thickness of m was caved and produced through windows located at the top .
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 ...
AbstractLongwall top coal caving (LTCC) techniques has been employed in favourable geological conditions widely in China since the mid80s and in Australia recently. With the improvement of highlypowered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological
Nov 11, 2016· This video shows the longwall installation and salvaging technology used for Moonidih colliery. ... Block Caving Mining Method ... The Principle of Longwall Top Coal Caving (LTCC ...
Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically – m (2 ft 0 in–3 ft 3 in) thick). The longwall panel (the block of coal that is being mined) is typically 3–4 km (– mi) long and 250–400 m (820–1,310 ft) wide.
Oct 01, 2014· The topcoal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The topcoal caving mining was estimated to have produced about billion metric tons every year, accounts for 18% of underground coal mining in China .The major features of the topcoal caving mining are that a conventional longwall mining with cutting height 2–3 m is .
Jun 01, 2018· Longwall Top Coal Caving (LTCC) is considered one of the most efficient methods for mining thick coal seams. 1 The LTCC method divides a thick coal seam into two sections including lower or cutting section and upper or top coal section. The lower section is mined by the conventional longwall method while the top coal section is typically extracted by means of caving under the .
Jan 01, 2010· 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. The technique is similar to traditional longwall mining in that a cutting head slices coal from the lower section of the coal seam onto a conveyor belt ...
The longwall top coal caving (LTCC) is an ef cient mining method to speci cally extract thick or ultrathick coal seams due to its good adaptability with respect to the large variations of 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 longwall panel mined above or below a gobsolid coal boundary occurs frequently in the Eastern Coalfields when abandoned roomandpillar or longwall workings are en¬countered in adjacent seams. The MULSIM/NL model was used to evaluate two design considerations related to the average vertical stress across the longwall face for this situation.
May 14, 2019· The Broadmeadow mine was started using a longwall to extract coal at m (15 ft) leaving the top section of the seam to fall into the gob. The adjacent opencut 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 topcoal caving technology has developed rapidly in China, in recent years. The application of longwall topcoal The application of longwall topcoal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 40o/o.
Following a number of "severe convergence events" after employing the top coal caving method at the Broadmeadow coal mine in Queensland, Australia, in 2010, BHP and SCT Operations Pty have put in place a geotechnical monitoring programme to mitigate these issues during the operation of the latest longwall .
Longwall Top Coal Caving (LTCC) was introduced in 2012. Another customer, CNX Coal Resources, gave a presentation called "Monster Wall," discussing the concepts, factors, restrictions and other considerations the mine faced when expanding the longwall face length from 457 to 610 meters (1,500 to 2,000 feet).
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 ...
Apr 16, 2020· Le et al. 29 proposed a discontinuous modeling method to research longwall top coal caving behavior, including the stress distribution, coal and rock failures, top coal caving .
Nov 15, 2017· The overhead coal is allowed to cave with the roof. The second longwall face is then started off(6 12months) later at the foot of the seam using the basic Top Coal Caving(TCC) method. 13. LONGWALL TOP COAL CAVING 14. LONGWALL TOP COAL CAVING ADVANTAGES • High coal recovery. • Operating cost reduction. • High productivity.
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. The technique is similar to traditional longwall mining in that a cutting head slices coal from the lower section of the coal seam onto a conveyor belt ...
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