May 16, 2015 2. Contents What is an LTCC method? Problems with thick seam mining. Mechanism . Advantages. Case study. Conclusion. 3. 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

A SEMINAR ON…. LONGWALL TOP COAL CAVING Presented by: J. Anil M.Tech-219MN1581 Department of Mining Engineering, NIT Rourkela, Odisha INTRODUCTION Long wall top coal caving (LTCC) is the method of extraction for underground mining of thick seam, i.e. greater than4.5m. It uses a long wall setup and natural forces to aid in the winning of coal. With this

RESPIRABLE DUST TRAINING PROGRAM Section 8 LONGWALL DUST CONTROL METHODS Sources of Longwall Dust Dilution reduces the ratio of the amount of dust in the air Adequate Air Prevent Leakage Gob Curtain Cut-Out Curtain Use of Belt Air Longwall Dust Problems Inadequate air volume and air velocity Insufficient water volume and pressure Poorly

Oct 23, 2014 Caving Underground Mining Methods (longwall, Sublevel caving, Block caving) 1. This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors. Ppt Salt Mining Powerpoint Presentation Free To

The first section gives an overview of underg round mining methods and practices as used commonly in underground mines, including classification of underground mining methods and brief explanations of the techniques of room-and-pillar mining, sublevel stoping, cut-and-fill, longwall mining, sublevel caving, and block caving. The second

The longwall mining method has the simplest system layout and provides continuous production and full potential for automation, which can further improve productivity and personnel health and safety. The panel layout is simple and conducive to good ventilation, and crews always work under protective supported roof. Since the longwall system with full caving leaves a lesser

eral coal, have recently converted to longwall mining. Longwall mining is also scheduled to be installed at other large underground oper-ations in the West. For these reasons, much of this chapter compares longwall mining with the dominant underground mining tech-nology in the West—room-and-pillar mining with continuous miners

barrier-pillar and that of longwall panel needs to be taken into account. Wider barrier-pillars to decrease the stress superposition. Shortwall mining method. Backfilling methods should be considered to enhance the stability. Using industrial wastes from the adjacent power plant, such as flue-gas desulfurization gypsum and fly ash. 24

Coal Mining Methods Ppt. 2009-8-27Layout 2 was also compared to conventional mining and it was concluded to be more economically feasible. However the latter is a proven mining method in these conditions and has a lower risk operational failure. Bord-and-pillar mining has some favourable promises such as improving labour difficulties, lowering

orebody configuration thr ough underground drilling. 1) Longwall mining. 2) Room-and-pillar mining. 3) Blast mining. 4) Shortwall mining. 5) Coal Skimming. perform an

Definition of Longwall Mining • A high extraction method of mining along the face of a predefined block of coal, referred to as a panel, while allowing the immediate roof to collapse upon advancement • Panel Configuration – Panels generally range in size from 500 to 1,000 feet in width and lengths exceeding two miles

These methods include: Multi-Slice Longwall, High Reach Longwall (single slice) and Longwall Top Coal Caving (LTCC). LTCC can mine out a seam varying from 4 to 20m in a single pass, requiring insignificant change to the face equipment. In comparison to the other two methods respectively, especially in complex

1.3 MINING METHODS 1.3.1 Introduction Once an ore body has been probed and outlined and sufficient information has been collected to warrant further analysis, the important process of selecting the most appropriate method or methods of mining can begin. At this stage, the selection is preliminary, serving only as the basis for a project layout and

Apr 30, 2010 LONGWALL GENERAL LAYOUT TOP Gate FACE Dip direction Bottom Gate - Longwall mining method includes drivage of two long roadways in coal and joining them at the end by a perpendicular drivage forming a face. 19. Different Longwall Methods 1. Longwall Advancing 2. Longwall Retreating Method Method 20

The mining automation market is expected to grow from USD 2.22 Billion in 2017 to reach USD 3.29 Billion by 2023, at a CAGR of 6.77% between 2017 and 2023. | PowerPoint PPT presentation | free to download

Apr 03, 2017 Longwall Method: There are two types of long wall methods of mining. a). Longwall Advancing:a). Longwall Advancing: It involves the extraction of panel of coal to be worked by advancing the face forward on a wide front leaving behind the roadways serving it. Fig. Longwall Method GOAF Direction of Advancing F A C E

Coal Mining Method.ppt . LONGWALL MINING This method of mining has proven to be more efficient than room and pillar mining, with a recovery rate of nearly 75 percent, but the equipment is more expensive than conventional room and pillar equipment, and cannot be used in all geological circumstances

Longwall Mining 3. Shortwall Mining. Underground Mining Underground modes of access include drift, slope, and shaft mining, and actual mining methods include longwall and room and pillar mining. Drift mines enter horizontally into the

In longwall mining, a panel of coal, typically around 150 to 300 metres wide, 1000 to 3500 metres long and 2 to 5 metres thick, is totally removed by longwall shearing machinery, which travels back and forth across the coalface

12.4 Underground mining method •Block caving-A kind of mass mining method with high production rates at relatively low cost.-Applicable only to large orebodieswith a height of more than 100 m which have a fairly uniform distribution of grade.-Disintegration of ore and country rock takes place by natural mechanical

METODE PENAMBANGAN RUNTUHAN (CAVING) PENDAHULUAN Metode ambrukan (caving method) adalah cara penambangan endapan bijih atau batubara pada tambang bawah tanah dengan cara pengambrukan yakni meruntuhkan deposit bijih atau batubara, karena adanya pengaruh gaya grafitasi K LA SIFIK A SI M ETO D E P EN A M B A N G A N R U N TU H A

appropriate mining method is selected based on technical, economic, and environmentally accountable considerations. The first step in selecting the most appropriate mining method is to compare the economic efficiency of extraction of the deposit by surface and underground mining methods . This section reviews surface mining methods and

ing methods in a variety of geologic environments. Most emphasis in this report, however, is placed on longwall and room-and-pillar mining of coal. It has been estimated that coal extraction is respon sible for over 90 percent of worldwide mining-in duced subsidence (Alien, 1978), Longwall mining

Feb 03, 2016 Abstract. Since the early 1980s, the longwall method has developed into the safest, highest producing and most productive form of underground coal mining, rivalling the performance of many surface mining operations. This is due in large part to the rapid uptake of computer based technologies for automation and monitoring; improved reliability

Longwall mining is one of the common methods for extracting coal in various thickness of coal seams and is much more effective, productive and safer than any other mining methods. The productivity of longwall mining is potentially high because it is basically a continuous operation requiring fewer workers and allowing a high production rate to

Mar 11, 2018 Longwall Mining. A highly productive underground mining method, longwall mining is used in a large horizontal spread of thin-bedded deposits of uniform thickness usually ranging from 0.6m to 1m. Used a lot by South African gold mining companies, this method can be used in both soft and hard rocks as the working area along the mining face can be