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  • Bord-and-pillar mining explained Illawarra Mercury

    31/05/2017· Bord-and-pillar extraction is the older of the methods, and  The word “bord” is not a misspelling of “board”, but a mining term for an underground space or room created

    Bord-and-pillar mining in inclined orebodies

    this goal more efficient mining methods need to be applied, for conventional mining will not be able to fulfill the company’s aims. With the improvements in trackless low profile machinery it is now possible to safely produce at a significantly reduced cost, and improved productivity. Mechanized bord-and-pillar mining is thus considered as a supplement to conventional mining, which accounts

    bord and pillar mining conveyor methodology

    bord and pillar mining conveyor methodology. Dedicated overland coal conveyor to Eraring Power Station mine using bord and pillar mining methods in the Wallarah, Great Northern, and Fassifern seamsget price Coal Mining Methods EMFI Longwall mining and room-and-pillar mining are the two basic methods of mining coal underground, with armored conveyor paralleling the coal face.

    Bord & Pillar Mining Science and Technology

    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. The [] Read More EXTENDIBLE CONVEYOR. Equipment 0 Comment. zIt is obvious

    Bord and pillar mining Coal and coal mining Te Ara

    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 collapse in a controlled way as miners retreated to the exit. Share this item Post to Pinterest Post to Facebook Post to Twitter. Using this item

    Design of Bord and Pillar method in coal mines

    27/02/2016· 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 longwall methods. The other countries where Bord and Pillar method predominates are Australia, The USA and South Africa. The key to the successful Bord and Pillar mining is selecting the optimum pillar

    EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL

    Bord and Pillar method of mining is one of the oldest methods. The key to the successful Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too small the mine will collapse. If the pillars are too large then significant quantities of valuable material will be left behind reducing the profitability of the mine. The issues relating to the stability of pillars and

    Optimization of Continuous Miner Operations in Bord and

    Bord and pillar mining The following methods are commonly used in bord and pillar method for development and depillaring using continuous miner: Development 1. Bord and pillar method Depillaring 1. Split and Fender system 2. Nevid method of mining Continuous miner A continuous miner is a large steel drum equipped with a tungsten carbide teeth that scraps the coal from the face. It is used

    Bord and pillar working with LHD/SDL

    10/06/2015· Equipment selection for bord and pillar mining Chain Conveyor MODEL Motor Power (KW) Capacity (tph) Peak Avg Width (mm) Speed( m/s) LDCC Skat-60 2 X 15 90 60 420 0.87 LDCC PF-00 2 X 30 90 60 426 0.87 MDCC PF-I-500 1 X 45 2 X 30 250 200 632-640 0.65 MDCC PF-Iv- 500 1 X 45 2 X 30 300 220 632-640 0.65 MDCC MIV 500 1 X 45 2 X 30 350 250 632-640 0.65 15. Belt Conveyor

    Pillar Strength and Design Methodology for Stone Mines

    during mining. At present pillar dimensions are either based on experience at neighboring mines or on strength equations that were developed for metal or non-metal mines. This paper presents a pillar design methodology that was developed from a study of pillar performance in operating stone mines. Data were collected that describe the rock mass quality, pillar conditions, mining dimensions and

    Bord and pillar mining Coal and coal mining Te Ara

    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

    Room and Pillar Mining an overview ScienceDirect Topics

    The major partial mining method are strip pillar mining, Wongawilli strip pillar mining, room and pillar mining, and thickness-limited extraction. 1. Strip pillar mining. Strip mining technology is an effective measure to reduce the overburden strata and surface movement and deformation, and it is also one of the important measures in the system of “Green Mining.”

    EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL

    Bord and Pillar method of mining is one of the oldest methods. The key to the successful Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too small the mine will collapse. If the pillars are too large then significant quantities of valuable material will be left behind reducing the profitability of the mine. The issues relating to the stability of pillars and

    PRODUCTIVITY IMPROVEMENT IN UNDERGROUND COAL MINES

    productivity improvement; lean manufacturing; underground coal mine; bord and pillar mining method; side discharge loader (SDL); lead distance 1. INTRODUCTION India has emerged as the third largest coal producer in the world after China and USA with a 9% share of the total glo-bal coal production. While the coal production from under-ground mining in countries like China, USA and Australia are

    Optimization of Continuous Miner Operations in Bord and

    Bord and pillar mining The following methods are commonly used in bord and pillar method for development and depillaring using continuous miner: Development 1. Bord and pillar method Depillaring 1. Split and Fender system 2. Nevid method of mining Continuous miner A continuous miner is a large steel drum equipped with a tungsten carbide teeth that scraps the coal from the face. It is

    COAL MINING TECHNOLOGY e-library WCL

    •In many of CIL new underground mines, bord & pillar mining is carried out using Continuous Miner method where geo-mining conditions permit. •The coal is mined by a continuous miner unit & loaded to shuttle cars which deliver coal to feeder breaker linked with belt conveyor

    Pillar Strength and Design Methodology for Stone Mines

    during mining. At present pillar dimensions are either based on experience at neighboring mines or on strength equations that were developed for metal or non-metal mines. This paper presents a pillar design methodology that was developed from a study of pillar performance in operating stone mines. Data were collected that describe the rock mass quality, pillar conditions, mining dimensions and

    itsimplementation inSouthAfricancollieries

    Bord-and-pillar mining 55percent. Labour Thereisasevereshortage ofbothskilledandunskilled labour inSouth Africa, and one solution might beto increase the productivity per man shift by increased mechanization, better training ofexisting manpower, and the creation of conditions in which higher productivity canbeachieved. The following are productivity figures for longwall andbord-and-pillar

    EXTENDIBLE CONVEYOR Mining Science and Technology

    Home / Bord & Pillar / Equipment / EXTENDIBLE CONVEYOR. EXTENDIBLE CONVEYOR . Equipment 0 Comment. zIt is obvious that shuttle car conveyance is a batch, discontinuous process which reduces the overall production rates achievable from a continuous miner as a result of the inter car wheeling delays. Extendable or flexible conveyor systems reaching from the tail end of the panel conveyor to

    Longwall mining Wikipedia

    Starting around 1900, mechanization was applied to this method. By 1940, some referred to longwall mining as "the conveyor method" of mining, after the most prominent piece of machinery involved. Unlike earlier longwall mining, the use of a conveyor belt parallel to the coal face forced the face to be developed along a straight line. The only other machinery used was an electric cutter to

    Bord & Pillar Method Mining Coal

    29/08/2013· Bord and pillar mining method comprises of two phases: 1. 2. Development or whole working: Pillars are formed. Depillaring or broken working: Extraction of pillars. Sometimes, both the phases proceed simultaneously. DEVELOPMENT WORK In development, pillars are formed by driving a series of narrow roads (headings) or galleries in the seam separated by block of solid coal parallel to

    Bord and pillar mining Coal and coal mining Te Ara

    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 collapse in a controlled way as miners retreated to the exit. Share this item Post to Pinterest Post to Facebook Post to Twitter. Using this item

    Optimization of Continuous Miner Operations in Bord and

    Bord and pillar mining The following methods are commonly used in bord and pillar method for development and depillaring using continuous miner: Development 1. Bord and pillar method Depillaring 1. Split and Fender system 2. Nevid method of mining Continuous miner A continuous miner is a large steel drum equipped with a tungsten carbide teeth that scraps the coal from the face. It is

    PRODUCTIVITY IMPROVEMENT IN UNDERGROUND COAL MINES

    productivity improvement; lean manufacturing; underground coal mine; bord and pillar mining method; side discharge loader (SDL); lead distance 1. INTRODUCTION India has emerged as the third largest coal producer in the world after China and USA with a 9% share of the total glo-bal coal production. While the coal production from under-ground mining in countries like China, USA and Australia are

    Bord and pillar applications on the platinum mine: T-cut

    bord and pillar development method don not have to be altered. The objective of the T-cut mining method is to increase the UG2 run of mine (ROM) grade to 3.4 g/t, to increase the current productivity of the workforce and to increase the extraction percentage of the UG2 orebody. Geology The UG2 orebody comprises a thick chromatite seam between a footwall of coarse crystalline pyroxenitic

    Pillar Strength and Design Methodology for Stone Mines

    during mining. At present pillar dimensions are either based on experience at neighboring mines or on strength equations that were developed for metal or non-metal mines. This paper presents a pillar design methodology that was developed from a study of pillar performance in operating stone mines. Data were collected that describe the rock mass quality, pillar conditions, mining dimensions and

    (PDF) Pillar design in coal mines ResearchGate

    The paper points out that bord-and-pillar mining is the most important method of coal extraction in South African underground coal mines, and advocates that pillar design procedures should be

    Mining Methods: Longwall, Horizon and Level Mining

    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 standard method adopted in American mines. Horizon

    itsimplementation inSouthAfricancollieries

    Bord-and-pillar mining 55percent. Labour Thereisasevereshortage ofbothskilledandunskilled labour inSouth Africa, and one solution might beto increase the productivity per man shift by increased mechanization, better training ofexisting manpower, and the creation of conditions in which higher productivity canbeachieved. The following are productivity figures for longwall andbord-and-pillar

    Productivity Improvement in Underground Coal Mines

    01/01/2013· Of the total output of coal from underground mines, more than 90% of coal is obtained by the bord and pillar method, the predominant method of mining followed in India, and the rest is mined by the longwall mining method. The Indian coal mining industry has witnessed a persistent decline in underground coal production over the years with more emphasis on opencast mining. The trend of

    Bord & Pillar Method Mining Coal

    29/08/2013· Bord and pillar mining method comprises of two phases: 1. 2. Development or whole working: Pillars are formed. Depillaring or broken working: Extraction of pillars. Sometimes, both the phases proceed simultaneously. DEVELOPMENT WORK In development, pillars are formed by driving a series of narrow roads (headings) or galleries in the seam separated by block of solid coal parallel to

    Bord and pillar applications on the platinum mine: T-cut

    bord and pillar development method don not have to be altered. The objective of the T-cut mining method is to increase the UG2 run of mine (ROM) grade to 3.4 g/t, to increase the current productivity of the workforce and to increase the extraction percentage of the UG2 orebody. Geology The UG2 orebody comprises a thick chromatite seam between a footwall of coarse crystalline pyroxenitic

    PRODUCTIVITY IMPROVEMENT IN UNDERGROUND COAL MINES

    productivity improvement; lean manufacturing; underground coal mine; bord and pillar mining method; side discharge loader (SDL); lead distance 1. INTRODUCTION India has emerged as the third largest coal producer in the world after China and USA with a 9% share of the total glo-bal coal production. While the coal production from under-ground mining in countries like China, USA and Australia are

    Pillar Strength and Design Methodology for Stone Mines

    during mining. At present pillar dimensions are either based on experience at neighboring mines or on strength equations that were developed for metal or non-metal mines. This paper presents a pillar design methodology that was developed from a study of pillar performance in operating stone mines. Data were collected that describe the rock mass quality, pillar conditions, mining dimensions and

    Criteria for selection of Board and pillar for multiple

    06/11/2016· Among the underground mining methods the “BORD and PILLAR” is the most common method in most of the mines. So the main purpose of this project is to focus on the selection criteria of Bord and Pillar workings without compromising the safety factor in multiple seam MULTIPLE SEAM: ‘Multi-seam coal mining’ is the mining of coal seams that overlay each other in a vertical depositional

    FIRST WORKINGS Mining Science and Technology

    In NSW the size of the pillar is restricted to a minimum of 1/10 of the depth, and the width of the bord to 5.5 m. Special exemptions are required for driving bords (roadways) wider than 5.5 m. The roadways are normally driven in rectangular shape.

    Hard-rock room and pillar mining best practice industry

    pillar mining 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 checkerboard pattern of rooms and pillars is created. The pillars of ore are left to support the overlying rock, but in some mines, after mining has reached the deposit’s

    depllaring in coal mines SlideShare

    18/09/2016· 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. 4. DEPILLARING It is the process of extraction of coal

    Continuous miner SlideShare

    09/04/2016· The bord and pillar method of mining is suited to work flat coal seams of average thickness and at shallow depths. Coal seams of 1.8 to 3 m thickness are best suited for this method, though the method has been successfulin thinner seams also down to a thickness of 1.2 m and in thicker seams up to 4.8 m in thickness. In seams with gradients of more than 1 in 4 difficulties are

    Mining Science and Technology

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