longwall top caving coal mining technology in india

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 …

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Underground coal mining in india

 · The other mining methods like reswide stall, sub levels caving, Longwall with increased height if extraction and Longwall with top coal caving arehaving its own drawbacks due to either less percentage of extraction or newer technology which is not yetpracticed in the country.

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CASE STUDY ON LONGWALL MINING

Abstract - The so - called "Longwall Mining System" have been effectively applied for 60-70 years in coal mining practice in USA, Australia and the Germany. In general, those are the systems of underground coal mining with mine entries directly communicating to the surface. Now at

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A Critical Review of Indian Underground Thick Coal Seam ...

morale for planning for thick seams extraction by longwall-based caving methods. Thus, the gap of safe and economic thick seam extraction from underground mining between India and other countries like China has remained unbridged. 1.9 It is pertinent to note that the longwall top coal caving

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calculation of periodic roof weighting in longwall mining

3 Attempts have been made to analyze the caving mechanism using numerical models, physical models empirical models and various forms of field measurement techniques. 2.2 LONGWALL MINING Longwall method of working consists in laying of long faces(60-200m long) from which all coal in working section of the coal seam is removed by a series of ...

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MINERAL MINING TECHNOLOGY Prefeasibility Study ...

Abstract—Longwall Top Coal Caving (LTCC), a relatively newer technology in India, is an underground mining method developed for thick seam extraction. Various factors and systematic approaches ...

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(PDF) Analysis and Optimization of Entry Stability in ...

To improve the coal recovery rate and reduce the excavation of the mining roadway, the 111 mining method of longwall mining is proposed in the Soviet Union based on the 121 mining method.

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Caving behaviour in Longwall

 · According to coal statistics about 50% of total coal production in the world accounted from longwall mining technology. Introduction of longwall mining dates back to 1906-07. But only in late sixties there was longwall mining with coal cutting machines. In between 1970-82 around 38 longwall faces were worked in Jharia and Raniganj Coal fieds.

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TOP CAVING – Mining Science and Technology

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 means of powered supports.

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Analysis of Failure Mechanism of Roadway Surrounding Rock ...

 · Fully mechanized top-coal caving mining technology has been widely used in the exploitation of extrathick coal seams in the western areas of China [8, 9]. Due to the thickness of coal seams, a large mined-out space forms, the caving gangue can hardly fill the goaf, and the mining area accordingly increases.

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Mining Safety of Longwall Top-coal Caving in 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. 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 40o/o.

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The study of Longwall Top Coal Caving method at Thar Coal ...

The Top Coal Caving methodology is the most efficient and effective for the extraction of these thick coal seams. The Longwall Top Coal Caving (LTCC) is an underground mining method that is gradually developed and accepted in the recent years. This method has turn into the key method for thick coal seams and getting better results in China.

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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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MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.

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(PDF) Longwall top coal caving (LTCC) mining technologies ...

 · Longwall top coal caving (LTCC) mining technologies with roof softening by hydraulic fracturing method May 2018 IOP Conference …

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Viewpoint Mining Magazine

Longwall Top-Coal Caving isn''t just an alternative mining technique; it can be the difference between a productive, profitable mine and an unsustainable operation. The technology reduces waste and operating costs, making for a more efficient operation. "By achieving the highest productivity possible, operations can stay profitable even in ...

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Prefeasibility study—Geotechnical studies for introducing ...

 · Longwall Top Coal Caving (LTCC), a relatively newer technology in India, is an underground mining method developed for thick seam extraction. Various factors and systematic approaches are to be considered and properly evaluated in order to qualify and gain confidence in the assessment of introducing LTCC mining method.

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Longwall Mining

 · Longwall in India First mechanized powered support longwall caving face was introduced in August 1978 at Moonidih, CIL. First Longwall face introduced in GDK.7 Incline in September 1983 in SCCL. There is no much improvement taken place in India in respect of Longwall technology due to various reasons. 13.

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Optimum Chain Pillar Design at the Deepest Multi-Seam ...

 · High-production methods like longwall mining with hydraulic powered supports are necessary to increase underground coal production in India. Longwall mining had a mixed success record for Indian geo-mining conditions. In this paper, an analysis is presented to optimally design an array of chain pillars in multi-seam longwall mining panels in the deepest coal mine in India. The …

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Effect of Face Length in Initial Mining Stage of Fully ...

 · Khanal introduce the various processes of designing Longwall Top Coal Caving (LTCC) technology in India Singh Ni Coal Co., Ltd (SCCL) mining area. A comprehensive analysis of geological and geophysical data in the mining area is carried out by the project, and a detailed geotechnical framework is developed for the assessment of LTCC technology ...

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Longwall Top Coal Caving Mining

longwall top caving coal mining technology. LTCC - Yancoal. LTCC. Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology to Australia at its Austar mine in 2006. Introduced in France, and further. Read more

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An Innovative Longwall Mining Technology in Tangshan …

view of MLM (multi-slice longwall mining); (c) CLTCC (conventional longwall top coal caving). 2.2. The New Strategy The novel approach Longwall Mining with Split-level Gateways (LMSG), which is an innovative patent invented by Dr. Zhao, J.L in 1998 at China University of Mining and Technology

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Longwall top coal caving design for thick coal seam in ...

 · The amount of coal for the production panel must be high enough to cover the initial investment of the mechanized longwall system. Longwall top coal caving (LTCC) is a part of longwall mining that is applicable for thick coal seams. China is an important country, which has best practices of LTCC in terms of high production rates.

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Mine Details | MiningLink

The Leighton contract at the Broadmeadows mine involved underground development mining, engineering and maintenance work and project management. Broadmeadows Mine First to use Longwall Top Coal Caving Technology The longwall top coal caving method of mining introduced at the Broadmeadows mine was the first to be installed in Queensland. The ...

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Figure 8 | Optimization of Caving Technology in an ...

Optimization of Caving Technology in an Extrathick Seam with Longwall Top Coal Caving Mining Figure 8 Top coal boundary under three caving technologies: (a) SOSCT; (b) MOSCT; (c) ICGCT.

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Application of Longwall Top Coal Caving in Challenging ...

Abstract-Longwall top coal caving (LTCC) techniques has been employed in favourable geological conditions widely in China since the mid-80s and in Australia recently. With the improvement of highly-powered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological

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The Principle of Longwall Top Coal Caving (LTCC)

 · has extensive experience in the design of roof supports for specific mining conditions. Longwall Top Coal Caving (LTCC) roof supports allow m...

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Prediction of Top Coal Cavability Character of a Deep Coal ...

 · Longwall top coal caving mining provides high productivity where thick coal seams exist. The study aims to predict the cavability character of the top coal for deep and thick coal seam in Soma lignite basin located at Western Turkey. Active longwall top coal caving mines are at a depth of 100–400 m and they were used for comparison purposes.

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Broadmeadow readies to take the LTCC ...

 · A spokesman for BHP Billiton could not confirm the delivery of the top coal caving equipment to the Broadmeadow mine but referred ILN to the company''s September exploration and development report, which indicated that the project was 83% and on track to be completed by 2013.. The Broadmeadow life extension project will increase productive capacity at the mine by 0.4 million …

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OptimizationofCavingTechnologyinanExtrathickSeamwith ...

e optimization of top coal caving technology is an efficient method to improve the recovery ratio in longwall top coal caving (LTCC). In extrathick coal seams, the conventional single-opening sequential caving technology (SOSCT) shows the following problems: low recovery ratio, high rock mixed ratio, and poor drawing balance.

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Latest Developments in Longwall Mining Technology

2015 MINING.CA T 6 Roof Support Technology Since 2006, has specialized in designing and supplying special shields for the longwall top coal caving method (LTCC), where extremely thick seams are being mined. This method utilizes a second AFC behind the shields to take the coal on top of the longwall outside of the face.

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Customized Roof Support Systems

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 2.8-3.0 m (9.2-9.8 ft) and then caving the top coal behind the roof supports onto a rear AFC. This type of longwall is in service for example at a mine in the ...

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(PDF) Longwall top coal caving (LTCC) mining technologies ...

 · Longwall top coal caving (LTCC) mining technologies with roof softening by hydraulic fracturing method May 2018 IOP Conference Series Materials Science and Engineering 354(1):012015

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Longwall Top Coal Caving (LTCC) technology

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 ...

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Longwall technology in india, SCCL

 · Longwall technology in india, SCCL 1. A PRESENTATION ON RETROSPECTIVE ASSESSMENT OF INDIAN LONGWALL MINING V.N.S.Prasad.M, UM(SCCL) U.Siva Sankar, UM(SCCL) Prof. Mukhopadhyay S K., IIT, KGP Prof. Debasis Deb., IIT, KGP Presented at 3 rd Asian Mining Congress, Kolkata 2.

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