Productivity Improvement in Underground Coal Mines - A ...

Of the total output of coal from underground mines, more than 90% of coal is obtained by the bord and pillar method, the predominant method of mining followed in India, and the rest is mined by the longwall mining method. The Indian coal mining industry has witnessed a persistent decline in underground coal production over the years with more ...


Method – Mining Science and Technology

The method was designed to limit some of the problemsinherent with the open ended lifting. It reduces the lenght of each lift so the a continuous miner and its crew are exposed to a lesser span of cantilevered roof. ... Bord & Pillar (15) Method (7) Traditional Pillar Extraction (2) Panel & Pillar Extraction (2) Modern Pillar Extraction (2 ...


Longwall mining - Wikipedia

The basic idea of longwall mining was developed in England in the late 17th century. Miners undercut the coal along the width of the coal face, removing coal as it fell, and used wooden props to control the fall of the roof behind the face. This was known as the Shropshire method of mining.


Coal Pillar Design Criteria for Surface Protection,

Coal Pillar Design Criteria for Surface Protection D Hill1 ABSTRACT Large areas of ground are permanently supported on coal pillars, both in extensive old workings and current drivages in active mining operations. Continued growth of civil infrastructure is resulting in more surface development above old bord and pillar mines and an increased ...


Major Mines & Projects | Wessels Mine

Mining Methods. Bord-and-pillar; Summary: Wessels is an underground bord and pillar operation with a current capacity of approximately 1.2 Mtpa of ROM production (100 per cent basis). Processing Technologies. Summary: Primary crushing of ore takes place underground, while secondary crushing forms part of the surface operations. ROM ore is ...


Bord-and-pillar mining explained | Illawarra Mercury

May 31, 2017· Two main methods of extraction are used for underground coal mines in New South Wales: longwall and bord-and-pillar extraction. Bord-and-pillar extraction is the older of the methods…


EVALUATION OF BORD AND PILLAR MINING SYSTEM IN …

EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL COAL MINES ... Bord and Pillar method of mining is one of the oldest methods. The key to the successful Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too small the mine will collapse. If the pillars are too large then significant


Bord and Pillar Coal Cutting Machine ~ Mining

Jan 22, 2014· Coal cutting machine is used in bord and pillar mining method of underground coal mining to make Undercut, Overcut or Middlecut to provide free face for the blasting operation. Development by CCM: The headings are Undercut, Overcut or Middle Cut by a coal cutting machine and shot holes are then drilled and charged with explosives and blasted.


Design of Bord and Pillar method in coal mines

Mining is the mother industry for other industries. For effectiveness in mining, different methods have been approached keeping in mind the production and safety. One of such methods is the Bord and Pillar method of mining. Bord and Pillar method of mining is one of the oldest methods. 3.


EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL …

EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL COAL MINES ... Bord and Pillar method of mining is one of the oldest methods. The key to the successful Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too small the mine will collapse. If the pillars are too large then significant


(PDF) Success of Continuous Miner in Bord and Pillar Method

PDF | On Sep 1, 2013, Jemish Modi and others published Success of Continuous Miner in Bord and Pillar Method


Room and Pillar Mining | Safe & Efficient | Sunrise Coal

When it comes to underground mining, there are different ways to approach removing coal, depending its structure and location. At the current Carlisle Mine and developing Bulldog Mine, Sunrise Coal is using the room and pillar mining method.At the developing mine in Clay City, Indiana, coal is close to the surface and will require surface mining.


THE MODERN WONGAWILLI METHOD – Mining Science and …

Home / Bord & Pillar / Method / Modern Pillar Extraction ... The size of the stooks and fenders can be changed as dictated by prevailing conditions and experience of the mining officials. ... output is attributed to the deployment of continuous bridge conveying or chain haulage system with place change method of heading development and pillar ...


Bord & Pillar Method | Mining | Coal - Scribd

Basic parameters of bord and pillar mining system 1. Gallery (bord) 2. Pillar. 3. Junction. Calculation of percentage of extraction during development If coal from the full seam thickness is extracted, the percentage of extraction during development is nearly 20% in deep mines and 35% in shallow mines.


Bord-and-pillar mining in inclined orebodies - SAIMM

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 operating costs and providing safer working conditions. The success of mechanized bord-and-pillar mining in narrow tabular steep dipping orebodies


MINING METHODS T - scienceandtech.cmpdi.co.in

9 Blasting Gallery Method Conventional bord and pillar mining in thick seams is associated with very low percentage of extraction [around 30% in a panel] even under favourable conditions. Extensive development of pillars carried out


Bord and pillar applications on the platinum mine: T-cut ...

The T-cut mining method is basically a partial pillar extraction method. The pillar (13 m x 13 m) created by the bord and pillar development is being stoped (only the UG2 reef) out for 2 m from the roadways on all sides, to leave an effective pillar of 9 m x 9 m. This method creates the required, higher extraction percentage and higher Run of


(PDF) Underground Mining Methods: Room and Pillar method

Room-and-pillar mining method has a low recovery rate (a large percentage of ore remains in place underground ). In many room and pillar mines, the pillars are taken out sta rting at the farthest ...


Room and Pillar Mining Method - SlideShare

Oct 22, 2014· Room and Pillar Mining Method 1. Hassan Z. Harraz [email protected] 2014- 2015 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.


Board & Pillar? | Coal, Colliery and Mining Forum.

Mar 24, 2013· Bord and pillar, (same as board I guess), Post and Stall, Stall Worked, and here is one up for grabs, for some reason I cannot shake off the thought that I recall this method being referred to as Pillar and Post locally at least, I know that it seems to be nonsensical by virtue of both terms being support methods, but we are a queer lot in this corner anyway (tail-gate corner that is, probably ...


Bord and Pillar Methods. | Coal, Colliery and Mining Forum.

Mining Methods and Geology. Bord and Pillar Methods. Mining Methods and Geology. ... Bord and Pillar Methods. General chat about bord and pillar. Threads and Posts; Total Threads: 5: Total Posts: 79: This board has 1 moderator: On This Board; You cannot create threads.


Gr5finalUnderground Mining Method Ppt | Mining | Economic ...

Gr5finalUnderground Mining Method Ppt - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Underground Mining Methods Group 5 Underground Mining Methods Coal Mining Metal Mining Bord and Pillar Unsupported Mining Supported Mining Caving mining Longwall Room and Pillar Cut and fill Longwall Blasting galllery …


Toward Pillar Design to Prevent Collapse of Room-and ...

TOWARD PILLAR DESIGN TO PREVENT COLLAPSE OF ROOM-AND-PILLAR MINES R. Karl Zipf, Jr. Chief, Catastrophic Failure Detection and Prevention Branch ... Traditional strength-based pillar design methods applicable to coal or hard-rock mines use a ... Room-and-pillar mining …


Room and pillar mining - Wikipedia

Feb 27, 2016· This method is sometimes called room-and-pillar mining. This can be better understand with the help of follwing fig . 6. APPLICABILITY OF BORD AND PILLAR METHOD The Bord and Pillar method is adopted for working. 1. A seam thicker than 1.5 m, 2. A seam free from stone or dirt bands.


Pillar Strength and Design Methodology for Stone Mines

Pillar Strength and Design Methodology for Stone Mines Gabriel S. Esterhuizen, Sr. Research Engineer Dennis R. Dolinar, Lead Research Engineer John L. Ellenberger, Lead Research Scientist NIOSH-Pittsburgh Research Laboratory Pittsburgh, PA ABSTRACT Underground stone mines in the United States make use of the room-and-pillar method of mining.


Mining Funda: Bord and Pillar method of Mining

Bord and pillar mining method comprises two phases i.e DEVELOPMENT and DEPILLARING. Sometimes both these phases proceeds simultaneously. In development, pillars are formed by driving a network of galleries, of which one set is generally parallel to the dip and the other set is parallel to the strike cutting the former at right angles.


Bord and pillar method,applicability condition an - YouTube

Feb 05, 2018· Bord and pillar method Applicability condition of Bord and pillar method Advantage and disadvantage of Bord and pillar method. ... coal mining methods - Duration: 5:21. Mining Technical 30,563 views.


Pillar Extraction using Continuous Miners | Introduction ...

PILLAR EXTRACTION USING CONTINUOUS MINERS. Overview. Now that longwall equipment has been developed to a stage where it is able to cope with most conditions satisfactorily, longwall mining is the most widely used method of secondary extraction. However, there are still mines and occasions where longwall mining is not suitable e.g.


COAL MINING TECHNOLOGY - e-library WCL

•Bord & Pillar is the traditional mining method used in India. •It is employed where geo-mining conditions are complex. •Coal is removed from the coal faces initially by developing a set of galleries leaving pillars in between to support the roof.


NSW Mining Methods - NSW Mining

Bord-and-pillar: Bord-and-pillar, or room-and-pillar, is the oldest underground mining technique and was common in NSW before longwall mining began in the 1960s. This method uses a grid of tunnels and involves progressively cutting panels into the coal seam whilst leaving behind pillars of coal to support the mine. This method has been in ...