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bord and pillar mining

Bord-and-pillar mining explained Illawarra Mercury

May 31, 2017· Bord-and-pillar extraction is the older of the methods, and  The word “bord” is not a misspelling of “board”, but a mining term for an underground space or

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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.

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Bord and pillar mining Coal and coal mining Te Ara

Bord and pillar mining Next. 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.

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Hard-rock room and pillar QueensMineDesignWiki

Room and pillar is an underground mining method that has applications to a wide variety of hard-rock deposits worldwide. It is commonly classified as an open-stoping method, meaning that development involves mining out underground cavities while leaving the

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Bord-and-pillar mining in inclined orebodies

different bord-and-pillar layouts were designed. These layouts were then evaluated according to dilution, produc-tivity, cost implications, profit and mining flexibility and the most suitable layout was chosen. Bord-and-pillar mining was then compared to conven-tional mining according to the following: financial analysis, dilution and flexibility.

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Room and pillar mines, Mining Techniques, Underground

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.

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Room-and-pillar mining coal mining Britannica

Other articles where Room-and-pillar mining is discussed: mining: Room-and-pillar mining: The most common mining system is room-and-pillar. In this system a series of parallel drifts are driven, with connections made between these drifts at regular intervals. When the distance between connecting drifts is the same as that between the parallel drifts, then a

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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

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Hard-rock room and pillar mining best practice industry

pillar mining a series of parallel drifts are driven, with connections made between these drifts at regular intervals. When the distance between connecting drifts is the same as that between the parallel drifts then a checkerboard pattern of rooms and pillars is created. The pillars of ore are left to

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VENTILATION PLANNING LAYOUTS FOR LARGE OPENING

Large room-and-pillar stone mining fundamentals The value per ton of ore for large room-and-pillar stone mines is typically low, therefore productivity must be high. Typical face areas are 12.2 m wide x 7.6 m high (40 ft wide by 25 ft high) with 4.3 m (14 ft) pulled with each blast (Figure 1). This equates to over 1,000 tons of stone per

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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

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Room and pillar mines, Mining Techniques, Underground

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

EVALUATION OF BORD AND PILLAR MINING SYSTEM IN

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

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Bord-and-pillar mining simulation YouTube

Sep 11, 2018· Dynamic simulation model of a 9-section underground coal mining operation at Anglo American's Zibulo Colliery, showing bord-and-pillar mining operations and

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(PDF) Underground Mining Methods: Room and Pillar method

Room (Bord)-and-Pillar Layout. In room & pillar mining, high safety levels in design is important, and to achieve this, understanding the behaviour of the pillars is essential. It is

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Hard-rock room and pillar mining best practice industry

pillar mining a series of parallel drifts are driven, with connections made between these drifts at regular intervals. When the distance between connecting drifts is the same as that between the parallel drifts then a checkerboard pattern of rooms and pillars is created. The pillars of ore are left to

More

VENTILATION PLANNING LAYOUTS FOR LARGE OPENING

Large room-and-pillar stone mining fundamentals The value per ton of ore for large room-and-pillar stone mines is typically low, therefore productivity must be high. Typical face areas are 12.2 m wide x 7.6 m high (40 ft wide by 25 ft high) with 4.3 m (14 ft) pulled with each blast (Figure 1). This equates to over 1,000 tons of stone per

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info on gold mining pillars

Bord-and-pillar mining in inclined orebodies. 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 will depend on the extent of the research and

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bord and pillar mining

Bord-and-pillar mining explained Illawarra Mercury. May 31, 2017 Bord-and-pillar extraction is the older of the methods, and The word “bord” is not a misspelling of “board”, but a mining term for an underground space or get price

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Pillar design in coal mines SlideShare

May 06, 2011· Cascading Pillar Failure (CPF) CPF is a potential problem faced by all Bord-and-pillar mining operations. CPF occurs when one pillar fails suddenly, which then overstresses the neighboring pillars, causing them to fail in very rapid succession. Within seconds, very large mining areas can collapse while giving little or no warning.

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Definition of bord-and-pillar method

The term bord-and-pillar is not used to any great extent in American mining literature, but has a place in English literature. Various names have been applied to this method, such as checkerboard system, Brown panel system, following up the whole with the broken, Lancashire bord-and-pillar system, modified room-and-pillar working, narrow

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Academics in Bord and Pillar Mining Technology Academia.edu

View Academics in Bord and Pillar Mining Technology on Academia.edu.

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