Bord and pillar mining method pdf file

The key to the successful bord and pillar mining is selecting the. It is employed where geomining conditions are complex. Hardrock room and pillar mining best practice industry workshop r. Criteria for selection of board and pillar for multiple seams.

At the developing mine in clay city, indiana, coal is close to the surface and will require surface mining. Sometimes both these phases proceeds simultaneously. Chapter 11 mining technology the federal coal leasing amendments act. The paper discusses the applicability of multislice bord and pillar method for the soft extra thick coal seams in the mae moh mine by means of numerical analyses using the 3d finite. The mining method selected for exploitation is determined mainly by the characteristics of the coal deposit and the limits imposed by safety, technology, environmental concerns, and economics. There are a number of basic pillar extraction methods, with numerous. Miners first extracted coal along roadways or bords, while the coal in between the bords acted as. This method requires less capital investment but is more labour intensive. Pdf practical importance of the room and pillars method different. Calculating the size, shape, and position of pillars is a complicated procedure, and is an area of. Selection of underground mining method working seam depth ranges from 300 m to 780 m.

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. With this method, ore is recovered in horizontal slices starting from the bottom and advancing upward. This methodology was then applied in the design of a mechanized bordandpillar mining layout for a given piece of ground vlakpoort and moddergat using a. Typical bordandpillar method 18 for the life of mine plan footwall analyst marula sep 2004 ian. Large roomand pillar stone mines in the united states represent a major sector of mines in the noncoal mining industry.

A system of mining in which the distinguishing feature is the winning of less than 50% coal on the first working. Bord and pillar is an underground mining method for extracting coal from belowground of earth. The success of bord and pillar mining is selecting the optimum pillar size. Various machinery combinations are used for extracting. Annandale centre for mechanised mining systems at the university of the witwatersrand the centre for mechanised mining systems at the university of the witwatersrand recently organized a hard rock room and pillar mining best practice. Bord and pillar methodhandouts free download as pdf file. Surface and subsurface mining are used to extract ore which is then processed. Design of bord and pillar method in coal mines slideshare. Longwall mining or coal pillar extraction by any other method causes the roof to. These west coast miners from the end of the 19th century pause in their labours. Seam should be free from stone or dirt bands and amount of water between them should be minimum. When the distance between connecting drifts is the same as that between the parallel drifts, then a read more. Evaluation of bord and pillar mining system in mcl coal.

Furthermore, the slices are as much as three metres thick and are taken by a continuous miner. The remainder of the coal is won by a retreating system, the cover being. 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 which are gradually cut away as the work proceeds. This paper presents a proposal for a comprehensive mining system. The second working is similar in principle to top slicing. Room and pillar mining technique with continuous miners is the predominant technology used in underground coal production. The success of mechanized bordandpillar mining in narrow tabular steep dipping orebodies. This diagram shows the traditional method of bord and pillar mining. The paper discusses the applicability of multislice bordandpillar method for the soft extra thick coal seams in the mae moh mine by means of numerical analyses using the 3d finite. Pillar extraction using continuous miners introduction. Room and pillar mining method falls in the category of open stopping method and is often used to excavate horizontal deposits with reasonably competent roof strata.

For effectiveness in mining, different methods have been approached keeping in mind the production and safety. Then the outer pillars were mined, leaving the roof to. Office of mine safety and health research national institute for occupational safety and health centers for disease control and prevention department of health and human services february 2010. Bordandpillar mining has some favourable promises such as improving labour difficulties, lowering operating costs and providing safer working conditions.

Mining methods generally speaking, there are two main methods of extracting coal from a seam. Now that longwall equipment has been developed to a stage where it is able to cope with most conditions satisfactorily, longwall mining is the most widely used method of secondary extraction. When it comes to underground mining, there are different ways to approach removing coal, depending its structure and location. Toward pillar design to prevent collapse of roomandpillar mines room and pillar mining method ppt,roomandpillar mining accounts for a significant portion of the total mineral production in the united stat as shown in table 1, evaluation of bord and pillar mining system in mcl coal mines. It is among the safest and one of the most ecologicallyfriendly approaches to mining coal today, creating a nonsubsidence environment no movement of land and maintaining clean water standards. The criteria for the selection of board and pillar method are. Numerous large roomand pillar mines began as surface quarries, that due to increased stripping ratios or environmental considerations, have become underground mining operations. With the passage of the surface mining control and reclamation act of 1977 congressional interest in the study of deep underground mining technology shifted. Room and pillar mining is a nonsubsidence plan for a mine, preserving the precious farmland above. Oct 29, 2015 019 mining in this video paul andersen explains how mining is used to extract valuable minerals from the earths crust. Feb 27, 2016 one of such methods is the bord and pillar method of mining. The conventional calculation formulas and conditional thickness methods were used to determine the roomandpillar mining system parameters. A case study illustration of the layout and support in an.

The prevailing method of bord and pillar mining was inadequate as recovery was low and required stowing with sand not easily available in many areas. Introduction in india, about 98% of underground output of coal is obtained by bord and pillar method and barely about 2% by longwall methods. Bord and pillar method of mining is one of the oldest methods of mining. Chapter 11 mining technology the federal coal leasing amendments act of 1976 charged ota to assess the feasibility of the use of deep mining technology on leased areas.

Besides this, there is no involvement of expansion in the lease area. There are two main methods of extracting coal by underground mining. Two main methods of extraction are used for underground coal mines in new south wales. In the shortwall mining method, the layout is similar to the longwall method except that the block of coal is not more than 100 metres wide. More info live chat bathopele mine, rustenburg technology. 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. Over 45% overall large percentage of the total coal reserves in india. The tcut mining method is basically a partial pillar extraction method. Toward pillar design to prevent collapse of roomand. Nov 21, 2019 bord and pillar mining method comprises two phases i. Bord and pillar, same as board i guess, post and stall, stall worked, and here is one up for grabs, for some reason i cannot shake off the thought that i recall this method being referred to as pillar and post locally at least, i know that it seems to be nonsensical by virtue of both terms being support methods, but we are a queer lot in this corner anyway tailgate corner that is, probably. There are two rivulets jores at surface namely puttiya. In the panel system of mining the coal seam is divided into a number of.

Pillars are left inside the stope to support the roof. Quizlet flashcards, activities and games help you improve your grades. Evaluation of bord and pillar mine working in mcl mines. Jul 29, 2016 bord and pillar is an underground mining method for extracting coal from belowground of earth. Bord and pillar method of working free download as pdf file. Underground mining methods study guide by fransterz includes 16 questions covering vocabulary, terms and more. The success of mechanized bord and pillar mining in narrow tabular steep dipping orebodies.

Roomandpillar minin g involves cutting a network of rooms or panels into the coal seam and leaving behind pillars of coal to support the roof of the mine. With bord and pillar mining and subsequent extraction of pillars dependent on. View evaluation of bord and pillar mine working in mcl mines from mining mn 201 at nit rourkela. 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. In this system a series of parallel drifts are driven, with connections made between these drifts at regular intervals. Introduction south africas coal mining industry, which is a little more than a century old, has been based predominantly on the bord and pillar method of mining. The first, and most generally used in the earlier years of coal mining, was the room or bord and pillar method of extraction and the second is the longwall method, which was used in the collieries of cape breton most recently. Numerical study on an applicable underground mining method. Mining method, underground mining, roomandpillar mining, sublevel. Coal is removed from the coal faces initially by developing a set of galleries leaving pillars in between to support the roof. Hardrock room and pillar mining best practice industry workshop. However, due to the challenges for underground mining such as poor geological conditions, extra thickness 20 30 m of coal seams, and weak mechanical properties of coal seams and the surrounding rock, the success possibility of underground mining and an applicable underground mining method is being investigated at the present.

At particularly deep depths, room and pillar mining can be more cost effective compared to strip mining due to the fact that significantly less overburden needs to be removed. Bord and pillar mining by continuous miner in hindi youtube. Miners chopped out coal with picks and then shovelled it into waiting carts. Toward pillar design to prevent collapse of roomandpillar mines. Assessing pillar geometries in the witbank and highveld.

Chapter 2 bord and pillar design in coal mining wiredspace. It is more an extension of the development work than mining. This method creates the required, higher extraction percentage and higher run of. The pillar m x m created by the bord and pillar development is being stoped only the ug2 reef out for 2 m from the roadways on all sides, to leave an effective pillar of 9 m x 9 m. Room and pillar mining is not particularly dependent on the depth of the deposit. 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 angles. Numerical study on an applicable underground mining. Bord and pillar mining method comprises two phases i. Then the outer pillars were mined, leaving the roof to collapse in a controlled way as miners retreated to the exit. Bordandpillar definition of bordandpillar by merriam.

Bord and pillar methodhandouts coal mining explosion scribd. This means that today, room and pillar mining is mostly used for high grade, but small. Under ground mining board and pillar method branch. Bord and pillar method of working coal mining coal scribd. Bordandpillar 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. Yamatomi encyclopedia of life support systems eolss underground mining methods and equipment s. Determination of the pillar and roof optimum parameters for new mining technology with continuous miner was the main aim of the present work. Bord and pillar mining has some favourable promises such as improving labour difficulties, lowering operating costs and providing safer working conditions. Pillar extraction, also referred to as retreat mining. The traditional technique for extracting coal, which miners brought from britain, depended entirely on muscle power. Homeapplicationstypical oreflow system in a bord and pillar coal mine. At the current carlisle mine and developing bulldog mine, sunrise coal is using the room and pillar mining method. Both methods are well suited to extracting the relatively flat coalbeds or coal seams typical of.

One of such methods is the bord and pillar method of mining. To do this, rooms of ore are dug out while pillars of untouched material are left to support the roof overburden. Hardrock room and pillar mining best practice industry. Post roomandpillar mining or postpillar mining is a combination of roomand pillar and cutandfill stoping. Success of continuous miner in bord and pillar method. Bord and pillar method of mining is one of the oldest methods. Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof. If the pillars are too large, then the extraction ratio decrease leading to less production and profitability and if the pillars are too small it. Pillar extraction an overview sciencedirect topics. This methodology was then applied in the design of a mechanized bordand pillar mining layout for a given piece of ground vlakpoort and moddergat using a. Bord and pillar mining coal and coal mining te ara. Research report on the coal pillar recovery under deep cover. Other articles where shortwall method is discussed.