Bord and pillar method of mining coal seam involves driving two sets of parallel inseam headings, one set being orthogonal to another, thereby forming square or rectangular pillars. These pillars are subsequently extracted allowing the overlying strata to cave in the decoaled area. In some cases where circumstances so ...
This research makes a critical review of the current design approach so as to understand the contributors to pillar failure in a section of an underground platinum bord and pillar mine.
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 ...
One among the oldest methods of mining is that the Bord and Pillar. It's a way within which the mined material is extracted across a horizontal plane while leaving "pillars" of untouched …
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 which need to create and innovate ...
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 document discusses the bord and pillar mining method. It describes the applicability of the method, including seam thickness and depth. It also covers the classification of bord and pillar systems into developing the entire area into pillars or using a panel system. The key elements of bord and pillar workings like panel, barrier, and pillar size are explained in detail. Support …
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 ...
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.
• 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 ...
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.
The Journal of The South African Institute of Mining and Metallurgy MAY/JUNE 1998 135 Introduction Most South African bord-and-pillar workings are planned using a pillar design methodology developed more than 30 years ago. During the intervening years this approach to …
Chikande et al. (2022) created and implemented a ventilation-on-demand (VOD) system for the bord and pillar mining method at a platinum mine in Zimbabwe to reduce the usage of excess air in the ...
industry best practice for bord and pillar mining (Platinum Task Team, 2013). It was found that there was a variation in the methodologies used to design bord widths but the majority of operations used the Voussoir beam theory to determine stable spans.
Early bord-and-pillar extraction mining methods however left much of the resource unmined, and during the 1960s total extraction methods, such as long walling and pillar extraction, were introduced to improve extraction (Cillié and Savage, 1961).
The current mining methods that were evaluated for the purposes of the study were conventional scattered breast mining, bord and pillar (LP) and mechanized breast (XLP) mining. In order to …
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 …
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 ...
The document discusses the bord and pillar method of underground coal mining. It describes how the method involves driving a series of parallel roads separated by blocks of coal (pillars) to develop the mine. After development, the pillars are extracted in the depillaring stage. Key aspects covered include statutory provisions, equipment used, pillar design considerations, …
Bord and pillar mining is favoured in medium to thick seams. Lou Caruana Bord and pillar mining operating costs are generally higher than those of a longwall but it may provide better utilisation and return on investment in the long …
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 ...
Frank shaft has been mining the UG2 orebody for nearly 5 years. The T-cut mining method was introduced to see if it could improve the grade of the run of mine (ROM) as well the extraction …
Download scientific diagram | Detail of the bord-and-pillar mine from publication: Numerical Analysis of Interaction Effects in Double Extra-thick Coal Seams Mining | The interaction effects in ...
Mining in this panel was undertaken with two, three or some-times four passes of a roadheader cutting overlapping sections of approximately 2.44 m.With this information it is believed unlikely the original pillar heights are less than 4.3 m or greater than 7.9 m, and so the fitted normal distribution is truncated at 4.0 m and 9.0 m.The remaining probabilities are then …
The document discusses the bord and pillar method of underground coal mining. It involves driving parallel roads called bords separated by coal pillars. Development involves driving the bords and pillars, followed by depillaring which extracts the pillars. Factors like seam thickness, depth, and roof/floor strength determine suitability. Support systems like roof bolting are used …
Extraction of coal by bord and pillar mining method poses many challenges with respect to the problem of strata control at higher depth. A depillaring panel at deep cover (greater than 525 m) is analysed the stability of pillar and rib using three-dimensional numerical modelling. From the numerical modelling, it was found that ribs' safety ...
1.. IntroductionIn India, underground coal production is mostly dependent upon the conventional bord and pillar (room and pillar) method of mining, although the overall output per man shift (OMS) through this method is generally not more than 1 ton in any of the mines [1].Large areas in all the subsidiaries of Coal India Limited and even in Singarani Coal …
The study deals with modern strata management, mainly strata control monitoring with analysis of roof–floor convergence, monitored induced stress, and assessment of ultimate mining-induced stress, preferably the vertical component during final extraction in a bord and pillar conventional Indian underground coal mine, Govinda Colliery, a mine ...
low production rates when compared with bord-and-pillar mining in thicker seams. There is a need to evaluate the various equipment that is used in the bord-and-pillar method in low seams, so that the most effective can be established. The relatively small number of …
x Bord and pillar mining (also known as room and pillar mining). x Surface mining operations x Open cut mining (strip mining) o Using draglines, o Using truck and shovels, and o Using a combination of above (integrated mining systems). Mining Methods 4 x Highwall mining ...