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 load and to be small enough to avoid loss of resource. An optimum pillar design method achieves such a scenario.
Apart from the commonly practiced "bord and pillar" method of mining followed in this country, the other methods of mining adopted in some collieries are: 1. Longwall Mining Method 2. Horizon Mining 3. Level Mining or Semi-Horizon Mining. Room and pillar method of mining is not practiced in any of the collieries in India though it is the ...
The mining layout is exactly the same as that of the normal bord and pillar layout (see Figure 3). The bords are 4 m wide and pillar sizes are 13 m x 13 m, thus creating centres of 17 m. The stopping width in the development phase is 1.8 m (0.2 m hanging wall, 0.8 m UG2 reef and 0.8 m footwall). The pillar that is created is then stoped out ...
The underground mining methods we use include room and pillar, narrow vein stoping and large-scale mechanised mining. Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the work proceeds. We use this for mining coal.
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 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.
: 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 …
Room (Bord)-and-Pillar Layout. Figure shows Room and Pillar Mining. Underground mining: room-and-pillar mining of thick seams –"Benching". Different approaches allow either the top or ...
The bord was considered as 6 m in width and the extraction heightwas 3 m. The 18 m wide square pillars were left between the openings. The panel dimension was taken 102 m in width and 120 m in ...
Room (Bord)-and-Pillar Layout Figure shows Room and Pillar Mining Prof. Dr. H.Z. Harraz Presentation Mining Methods 18 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" is above the mining cavity, and ...
Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the …
2B.Tech Final Year Student, Dept. of Mining Engineering, Godavari institute of Engineering & Technology -----***-----Abstract - In Indian underground mines by conventional mining the loss of coal is more and the safety also less so the many underground mines planning to introduction of the use of the Continuous miner in bord and pillar mining ...
A trackless bord and pillar mining method is employed in the thicker Merensky resource areas with mining heights varying between 2.0m and 2.2m. A conventional hybrid breast mining layout is currently envisaged for the extraction of the narrow Merensky reef area.
rationalises many years of mining experience, can be used to solve practical problems. In this paper a practical method of the design of simple bord and pillar layouts is discussed. 'Collieries Research Laboratory, Chamber of Mines of South Africa. ¹ é ô ö ó è ù ç é è æ ý º å æ í ò é ø ® å ø é û å ý ù ò è é ö ð ...
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 ...
Most of the bord and pillar method of coal mining has been done in depth range less than 300 m as at greater depths pillars experience crush. However, in India in some cases the depth of mining by bord and pillar method has been around 600 m, though mining at such depths is beset with the problems of strata control.
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 …
A room and pillar mine features a vertical shaft leading down to the productive area. The productive area is where most mining activity takes place because it's where the valuable ore deposits are. The shaft is used for material handling and extraction. This area consists of a series of rooms. Today, they're typically laid out in grid formation ...
than 90 % of coal is o btained by t he bord and pillar method, the predo minant method of mining followed in India, and the rest is mined by the lo ngwall mining met hod.
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 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.
Bord & Pillar Home / Archive by category: Bord & Pillar Dust Control Ventilation / Ventilation / Safety 0 Comment One of the environmetal concerns for underground …
BORD AND PILLAR MINING SYSTEM Bord and pillar mining method comprises two phases, i.e., development or 'whole working' and depillaring or 'broken working'. Sometimes both these phases proceed simultaneously. In development, pillars are formed by driving a network of galleries, of which one set is
Bord and pillar mining. 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 roof. The outer pillars were then mined, leaving the roof to collapse in a controlled way as the miners retreated towards the exit.
Board and pillar mining method is done in two stages: First Working; The stage of formation of a network of roadways is known as development or first working. …
Pillar extraction, also called depillaring, pillar pulling, pillar robbing, and just "pillaring," is the extraction of ore or coal from the pillars left during development. As pillars are …