bord and pillar

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 development efforts.

Bord & Pillar

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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 NIOSH

Subsidence risk assessment of decommissioned bord-and-pillar collieries Article in International Journal of Rock Mechanics and Mining Sciences 60 June 2013 with 235 Reads DOI: 101016/jijrmms.

Bord and pillar 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.

Bord & Pillar

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Productivity Improvement in Underground Coal Mines

The only way to achieve this is to reduce production costs by improving productivity, efficiency and the effectiveness of the equipment This paper aims to identify the various factors and problems affecting the productivity of underground coal mines adopting the bord and pillar method of mining and to propose suitable measures for improving them.

Room-and-pillar mining

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.

Bord-and-pillar

Bord-and-pillar definition is - of or relating to a system of coal mining in which tunnels are driven in a checkerboard pattern having massive square pillars between them.

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Pillar design incoalmines

Fig 3-Potential areas of application of bord-and-pillar mining It should be noted that both bounds are controlled largely by economic factors For the most severe con-straints, namely acoal-to-waste ratio of1:10 and an upper limit for lost coal of30per cent, the field of application ofconventional bord-and-pillar.

Definition of bord-and-pillar method

Definition of bord-and-pillar method A system of mining in which the distinguishing feature is the winning of less than 50% coal on the first working It is more an extension of the development work than mining The second working is similar in principle to top slicing The remainder of the coal is won by a retreating system, the cover being.

Development an instability model for bord-and-pillar goaf

Abstract: Bord-and-pillar mining has been widely used in northwestern China, and lots of remains of coal resources such as coal pillars, roof coal, bound coal and so on, is a significant waste Furthermore, the accidents caused by the instability of bord-and-pillar goaf are commonly faced problems These accidents may have detrimental effects on mining areas residents in the form of injury.

Room and pillar mining

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.

Increasing Production Time in Continuous Mining Methods

Increasing Production Time in Continuous Mining Methods EE Dorey D McGinness SYNOPSIS The use of continuous miners in a conventional bord and pillar section results in a considerable amount of unproductive time This is due to the roof support requirements, continuous miner configurations, and shuttle car 'change-outs' These factors have.

Bord-and-pillar mining explained

May 31, 2017· Bord-and-pillar mining is used in first workings of a deposit, and when irregularly shaped deposits, or sensitive environmental conditions, call for a lighter touch.

will no longer build tracked drills, bord and pillar

will no longer build tracked drills, bord and pillar mining machinery , where room and pillar products are produced, and 40 workers in Denison, Texas where track drills are manufactured.

Bord & Pillar Method

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 min.

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.

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Mining Funda: Bord and Pillar method of Mining

Bord and pillar mining method comprises two phases ie 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 angl.

BORD AND PILLAR METHODpptx

View Test Prep - BORD AND PILLAR METHODpptx from ENG 286 at Davidson College Under Ground Mining Board and Pillar Method Branch : Mining and Min Surveying Engg Presentation By :.

Coal Mining Science & Technology @ UOW

Coal Mining Science & Technology These websites contain information on the phenomena, technology, management and other aspects of Coal Mine Outbursts, Longwall Mining, Bord and Pillar Mining and Heading Development including current reports and scientific publications.