our products

D&Q Mining is a high-tech company integrating R&D, production and sales. It provides mature products and solutions such as crushers, sand making, milling equipment, mobile crushing stations, etc., for aggregate, mining and waste recycling.

bord and pillar coal mining

Bord-and-pillar mining explained Illawarra

31-05-2017  Pillars of coal are left behind to support the roof as the coal is cut away with a machine called a continuous miner. Bord-and-pillar mining is used in first workings of a deposit, and when ...

More

Bord and pillar mining – Coal and coal mining – Te

This diagram shows the traditional method of bord and pillar mining. Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof. Then the outer pillars were mined, leaving the roof to collapse in a controlled way as miners retreated to the exit.

More

Room and pillar mining - Wikipedia

Room and pillar (variant of breast stoping), is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars. To do this, "rooms" of ore are dug out while "pillars" of untouched material are left to support the roof overburden. Calculating the size, shape, and position of pillars is a complicated procedure, and is an area of active research. The technique is usually used for relatively flat-lying deposits, such as those that follow a particular stratum.

More

EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL

Bord and Pillar method of mining. Bord and Pillar method of mining is one of the oldest methods of mining. The success of Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too large, then the extraction ratio decrease leading to less production and profitability and if the pillars

More

Room-and-pillar mining coal mining Britannica

In coal mining: Mining methods classified into four distinct categories: room-and-pillar, longwall, shortwall, and thick-seam. Read More; open-stoping methods. In stoping. A common open-stoping method is room-and-pillar mining, in which pillars of ore are left standing to support the rock over a flat-lying ore body. Read More

More

Design of Bord and Pillar method in coal mines

27-02-2016  Bord and Pillar method of mining is one of the oldest methods. 3. INTRODUCTION In India, about 98% of underground output of coal is obtained by Bord and Pillar method and barely about 2% by longwall methods. The other countries where Bord and Pillar method predominates are Australia, The USA and South Africa.

More

Criteria for selection of Board and pillar for

Page 3 BOARD AND PILLAR: The development of mine by the method of working known as Bord and Pillar consists of driving a series of narrow roads, separated by blocks of solid coal, parallel to one another, and connecting them by another set of narrow parallel roadways driven nearly at

More

(PDF) Underground Mining Methods: Room and

Underground mining: room-and-pillar mining of thick seams –“Benching”. Different approaches allow either the top or. bottom part of the seam to be mined out first. Note: the “hangingwall ...

More

(PDF) Pillar design in coal mines - ResearchGate

01-01-1980  The paper points out that bord-and-pillar mining is the most important method of coal extraction in South African underground coal mines, and advocates that pillar design procedures should be ...

More

Board Pillar? Coal, Colliery and Mining Forum.

07-02-2021  Plus if your working under cities/towns reservoirs and other sensitive areas, Bord and Pillar is the only way to extract coal. It does have drawbacks, in that it is hard to ventilate, you only get around 50% max extraction rates. It's not all that long ago when all coal in the UK was extracted by Bord and Pillar.

More

Bord Pillar Method Mining Coal - Scribd

Bord Pillar Method - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. underground coal mining

More

Characterization of coal mine panels in bord and pillar ...

Characterization of coal mine panels in bord and pillar working The Journal of The South African Institute of Mining and Metallurgy NOVEMBER 2003 565 Table Ia Module 1a: Building module of the group ‘panel specifics’ (Applicable to depillaring with formation of small pillars as final operation or to extraction by broadening of galleries)

More

Bord and Pillar Coal Cutting Machine ~ Mining

22-01-2014  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.

More

(PDF) Underground Mining Methods: Room and

Room (Bord)-and-Pillar Layout. ... In room pillar mining, ... bolter/miners for coal mining and other continuous mining systems for both hard and soft rock.

More

Mining Magazine - Bord And Pillar - Page 1

NSW's Independent Planning Commission has ruled that Dartbrook can restart bord-and-pillar mining Development 12 AUGUST 2019. BFS Managem contract for DRA. Engineering firm will oversee mining, plant and more for Morocco copper mine ... Australian Pacific Coal seeking to bord and pillar its New South Wales operation Coal 06 MARCH 2018.

More

DESIGN OF SUPPORT SYSTEM FOR BORD AND PILLAR WORKINGS

1.1 Accident statistics of Indian underground coal mines 8 1.2 Present support system 9 CHAPTER – 2 LITRATURE REVIEW 11 2.1 Rock load 11 2.2 Support estimation 11 2.3 2.3.1 2.3.2 Guidelines for drawing of support plans in bord pillar Barton’s Q-system Bieniawski’s RMR system 11 12 13 2.4 CMRI-ISM Rock Mass Classification 13

More

Coal pillar extraction at deep cover: With special ...

01-05-2011  Indian geo-mining scenario of coal pillar extraction is provided. Status of bord and pillar mining for deep coal seams is reviewed. Inherited instability issues of natural support during depillaring of a deep seam under competent roof (high stress conditions) are discussed. Influence of caving of competent overlying strata during extraction of deep seated pillars is shown by case studies.

More

Coal mining - Wikipedia

Most coal seams are too deep underground for opencast mining and require underground mining, a method that currently accounts for about 60 percent of world coal production. In deep mining, the room and pillar or bord and pillar method progresses along the seam, while pillars and timber are left standing to support the mine roof. Once room and pillar mines have been developed to a stopping ...

More

Board Pillar? Coal, Colliery and Mining Forum.

07-02-2021  Plus if your working under cities/towns reservoirs and other sensitive areas, Bord and Pillar is the only way to extract coal. It does have drawbacks, in that it is hard to ventilate, you only get around 50% max extraction rates. It's not all that long ago when all coal in the UK was extracted by Bord and Pillar.

More

Bord and Pillar Methods. Coal, Colliery and

British Coal Mining Industry. The Youngsters and Researchers Section. NCB/British Coal. Pits of The Midlands. Remains of the UK Coal Industry. ... General chat about bord and pillar. Threads and Posts; Total Threads: 5: Total Posts: 86: This board has 1 moderator: On This Board; You cannot create threads. You cannot reply to threads.

More

Bord and pillar mining – Coal and coal mining –

This diagram shows the traditional method of bord and pillar mining. Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof. Then the outer pillars were mined, leaving the roof to collapse in a controlled way as miners retreated to the exit.

More

Bord Pillar Method Mining Coal - Scribd

Disadvantages of bord and pillar mining method Ventilation is sluggish at the working places as compared to L/W method because of multiple connections and large no. of ventilation stoppings which provides sources of leakage. The extraction losses are generally higher than in other methods of mining.

More

Room and pillar mines, Mining Techniques,

Room and pillar. Room and pillar is also known as bord and pillar is a mining system in which the mined material is taken out across a horizontal plane while leaving "pillars" of unscathed material to support the overstrain leaving open regions or "rooms" underground.

More

(PDF) Success of Continuous Miner in Bord and

This paper deals with the use of continuous miner and its success in bord pillar method of underground coal mining. Discover the world's research 19+ million members

More

Subsidence risk assessment of decommissioned

01-06-2013  In full-extraction bord-and-pillar mining these pillars were systematically removed and the overburden deliberately caved. While in partial extraction the pillars, or some portion of them, remained as remnant coal specifically to provide support to the roof and prevent collapse.

More

EVALUATION OF UNDERGROUND COAL PILLAR DESIGN

The two common methods of underground mining include Longwall mining and Bord and Pillar method of mining. The method mostly prevalent in the Indian underground mines is the Bord and Pillar method of mining because of its history and ease of operation. The most important aspect of Bord and Pillar mining is the design of pillars.

More

Coal pillar extraction at deep cover: With special ...

01-05-2011  Bord and pillar is one of the major underground mining methods in USA. Different practises of this mining method in the country witnessed a number of important technical developments: starting from roof support ( Mark and Molinda, 2005 ) to depillaring techniques ( Mark et al., 2002 ).

More

Board Pillar? Coal, Colliery and Mining Forum.

07-02-2021  Plus if your working under cities/towns reservoirs and other sensitive areas, Bord and Pillar is the only way to extract coal. It does have drawbacks, in that it is hard to ventilate, you only get around 50% max extraction rates. It's not all that long ago when all coal in the UK was extracted by Bord and Pillar.

More

Bord and Pillar Coal Cutting Machine ~ Mining

22-01-2014  The other types of coal cutting machine especially designed for bord and pillar working are: (1) Arc-Shearing (Arcwall-and-shearing) coal cutters and (2) Arcwall coal cutter. ARCWALL AND SHEARING COAL CUTTERS FIGURE 2 The Arcwall and Shearing coal cutters (Figure 2) are designed to give cut on the face in any direction.

More

Bord and Pillar Methods. Coal, Colliery and

British Coal Mining Industry. The Youngsters and Researchers Section. NCB/British Coal. Pits of The Midlands. Remains of the UK Coal Industry. ... General chat about bord and pillar. Threads and Posts; Total Threads: 5: Total Posts: 86: This board has 1 moderator: On This Board; You cannot create threads. You cannot reply to threads.

More

Bord and pillar mining – Coal and coal mining –

This diagram shows the traditional method of bord and pillar mining. Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof. Then the outer pillars were mined, leaving the roof to ...

More

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.

More

Room and pillar mines, Mining Techniques,

Room and pillar. Room and pillar is also known as bord and pillar is a mining system in which the mined material is taken out across a horizontal plane while leaving "pillars" of unscathed material to support the overstrain leaving open regions or "rooms" underground.

More

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

Room-and-pillar mining accounts for a significant portion of the total mineral production in the United States As shown in table 1, well in excess of $6 billion worth of mineral commodities are produced each year by this method. A substantial portion ($3.55 billion) of coal production still comes from room-and-pillar mining. Metallic minerals

More

Bord And Pillar Mining Working Photos -

towards high productivity under a claystone roof - underground COAL. Feb 15, 2001 ... their history to find an economic mining method under these ... initially a Bord and Pillar operation and when the reserves of the .... inspector commented that the bord was about 22 ft [6.7m] wide and the working height of the coal was .... to fret and consequent rib and roof falls occurred (see Photos 1 2).

More

Evaluation of Bord and Pillar Mining System in

Evaluation of Bord and Pillar Mining System in MCL Coal Mines \ud . By R C Nayak and S K Dalai. Download PDF (1,002 KB) Abstract. The importance of mining is definitely significant to human civilization ... One of such methods is the Bord and Pillar method of mining.

More

Optimization of Continuous Miner Operations in Bord and ...

coal, while removing the machine operator further from the working area. 2. LITERATURE REVIEW Introduction To achieve the mass production in bord and pillar mining the implementation of continuous miner is necessary. The continuous miner used to cut the coal and transferred to the shuttle car to unload. Bord and pillar mining

More

Hard-rock room and pillar - QueensMineDesignWiki

Room and pillar has a rich history in soft-rock mining and is commonly associated with coal, potash, uranium, and other industrial materials. Although, it is not uncommon to see room and pillar used in hard-rock metal mines for such commodities as lead, zinc, and copper.

More

EVALUATION OF UNDERGROUND COAL PILLAR DESIGN

2.1. Bord and Pillar working method 6 2.2. Pillar Failure 7 2.3. Effect of mining method on pillar strength 8 2.4. Basic principles of pillar design 8 2.5. Pillar Strength Formulas 15 2.6. Factor of Safety 20 2.7. Size of pillars 21 2.8. Laboratory Techniques 22 3.

More

COAL MINING TECHNOLOGY - e-library WCL

BORD PILLAR MINING •Currently, most of CIL mines using Bord Pillar remove coal from the face by blasting deploy SDL or LHD for loading and transportation of coal in the active mining areas. •Coal transportation to surface is either by a series of belt conveyors or rope haulage drawn coal tubs.

More