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What is bord-and-pillar mining? 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 ...

PRODUCTION RATE 1-Bord and Pillar method of mining is one of the oldest methods . Pillars are left as support and output is nearly 20%.after development pillars are being extracted . 2=. And extraction of pillars increases the output to 60%. So this project deals with extraction of pillars to increase the efficiency of mining with safety.

While the coal production from underground mining in countries like China, USA and Australia are about 95, 33 and 20% respectively, India produces only about 15% of coal from underground mines (Prasad 2009). Of the total output of coal from underground mines, more than 90% of coal is obtained by the bord and pillar method, the …

The run-of-the-mine (ROM) coal production capacity of the mine is expected to be 5.7 million tonnes per annum (Mtpa). The Whynot coal seam will be mined using the underground bord and pillar technique, while the longwall extraction method will be used for the Woodlands Hill, Arrowfield and Bowfield coal seams.

Post-pillar mining Applies. Equipment to aid. The advancement of the panel is done through several parallel galleries (5 galleries or more, depending on the mine) connected by dashes. It takes more fronts in conventional mode (drill- blast-load-haul) and less fronts with continuous miner. The use of continuous miner least affects the roof and ...

The success of a bord and pillar mining method in the exploitation of platinum heavily depends on a comprehensive and competent pillar design method. Pillars need to be large enough to contain ...

4. Characteristic of R & P It is the most common supported pillar method, designed and used primarily for mining flat-lying seams, or tabular orebodies, or gently dipping bedded ore deposits of limited thickness (like coal, oil shale, limestone, phosphate, salt, trona, potash, and bedded uranium ores,). Room and pillar methods are well …

techniques. 'Bord and pillar' is the oldest coal mining technique used in Australia and was common in New South Wales prior to about 1960. Originally it was the sole method used to extract all coal, but now it is generally used as the precursor to longwall mining to prepare the workings for the longwall extraction phase.

At present, production by longwall mining accounts for a minor amount of total underground mining production with the majority coming from bord-and-pillar methods. Since it is envisaged that longwall mining will require time to become established in India, bord-and-pillar methods will continue to be dominant in the foreseeable future. Thus, it ...

The main objective of this present work is to review the overall Bord & Pillar working used in coal mines. 3. METHODOLOGY Steps involved in Bord and Pillar Mining System Develop the entire area into pillars and then extract the pillars starting from the boundary. Develop the area into panels and extract pillars subsequently panel wise.

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 …

The meaning of BORD-AND-PILLAR 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 which are gradually cut away as the work proceeds.

The LP equipment was used for bord and pillar mining, and over the course of the past 15 years there have been significant improvements in both production and safety, with the average monthly production per crew currently being approximately 2400 m 2. Due to the historically high capital costs of the XLP equipment, as well as the inconsistent ...

8.3.1: Room and Pillar Method. Room and pillar mining is arguably the most important underground mining method in practice today. The majority of underground production comes from room and pillar mines, and the majority of underground mines, by number, employs the room and pillar method! Think about that! Let's start out by looking at this ...

This diagram shows the traditional method of bord and pillar mining. Miners extracted coal along roadways or bords, with the coal between the bords acting as pillars holding up the …

• Bord and pillar (1.8 m–2.2 m stope widths using low-profile (LP) mechanized equipment) • Breast mining (1.3 m stope width using extra-low profile (XLP) mechanized equipment) A graphical representation of the bord and pillar and mechanized breast mining methods is shown in Figure 1 and Figure 2. It is important to note that the ...

Pillar design is the key to the success of bord and pillar coal mining. Estimating the stress at different positions in a pillar is very important to work out the pillar size under the coal pillar strength …

mining and its development correlate closely with cultural progress. Mining processes involve prospecting for ore bodies, analysis of the profit potential of a proposed mine, extraction of the desired materials. One of such methods is the Bord and Pillar method of mining. Bord and Pillar method of mining is one of the oldest methods of mining.

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

pillar method of coal mining has been done in depth range less than 300 m as a t greater depths pillars experience crush. However, in I ndia in some cases the depth of mining for bord

Shortwall mining of the developed bord and pillar workings would be a good option to overcome the limitations of the conventional bord and pillar method of mining. 3. Status of the Passang seam of Balrampur mineThe geo-mining parameters of the proposed area of the Balrampur mine for shortwall mining panel are given below.

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 25+ million members

A method for calculating the load acting on a pillar of coal in a bord-and-pillar mine is described for the purpose of back analysing pillar failure or assessing the stability of a panel of pillars.

Among different methods of underground mining technology adopted for coal extraction, bord and pillar mining is the most popular and predominant method of underground mining in India. This method is characterised with small capital investment and faster rate of return on capital. Varying geomining conditions demand scientific approach …

CW: The primary benefit of bord and pillar mining is that for an equivalent production the capital cost of a bord and pillar operation would be 45% to 65% of that of a longwall mine. The operating costs may be 30% to 60% more than a longwall, but the risks are significantly less and production variances are very low compared to longwall.

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 …

As bord and pillar workings are developed roof support becomes a major consideration and operating cost item. Support requirements vary considerably and are dependent on the physical conditions in the seam, which are often depth dependent, and the length of time that the workings are required to be serviceable. ... In underground mining, first ...

4/16/2013 1 BORD AND PILLAR METHOD APPLICABILITY OF BORD & PILLAR METHOD • A seam thicker than 1.5 m. • A seam free from stone or dirt bands. Stone or dirt bands, if present in a seam, can be easily disposed of for strip packing in long wall advancing method of mining. • Seams at moderate depth.

Pillar extraction, (also referred to as retreat mining; pillar recovery; stooping; pillar robbing; and bord and pillar second workings) is the practice of forming a series of pillars and then partially or totally extracting some or all of the pillars, usually with mining operations retreating out of a panel. There are a number of basic pillar extraction …