ppt for continuous mining in bord and pillar

ppt for continuous mining in bord and pillar

Board Pillar - SlideShare

Sep 15, 2015  Board Pillar. 1. Step mining It is an adaptation for the case where the dip of the ore body is too big (15o to 30o) to use equipment on tires at the same time that its thickness is relatively small (2 - 5 m). A special orientation of transit and stops

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Design of Bord and Pillar method in coal mines

Feb 27, 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

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BORD AND PILLAR METHOD.pptx - Under Ground Mining Board ...

View Test Prep - BORD AND PILLAR METHOD.pptx from ENG 286 at Davidson College. Under Ground Mining Board and Pillar Method Branch : Mining and Min Surveying Engg. Presentation By

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Identifying Optimal Mining Sequences for Continuous Miners

In room-and-pillar mining: ... Identifying Optimal Mining Sequences for Continuous Miner Joseph C. Hirschi Project Manager Illinois Clean Coal Institute 2012 Illinois Mining Institute . Title: PowerPoint Presentation Author: Kathy Bendler Created Date: 8/22/2012 4:50:28 PM ...

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Bord Pillar Method Mining Coal - Scribd

Bord AND PILLAR MINING METHOD comprises of two phases: development and depillaring. Pillars are formed by driving a series of narrow roads (headings) or galleries in the seam. Percentage of extraction during development is nearly 20% in deep mines and 35% in shallow mines.

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Bord-and-pillar mining explained Illawarra Mercury ...

May 31, 2017  Pillars of coal are left behind to support the roof as the coal is cut away with a machine called a continuous miner. Bord-and-pillar mining is used in first workings of a deposit, andwhen ...

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CONTINUOUS MINER – Mining Science and Technology

Continuous miners operate a room and pillar mining system. A series of 18 to 20 foot wide rooms are driven in the coalbed with pillars or columns of coal left standing to help support the roof. Roof bolts, typically four to six feet long steel bolts, are inserted into holes bored into the roof to bind the strata together support the roof.

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EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL

Bord and Pillar method of mining. Bord and Pillar method of mining is one of the oldest methods of mining. The success of Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too large, then the extraction ratio decrease leading to less production and profitability and if

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STRATA CONTROL TECHNOLOGY FOR MASS EXPLOITATION

3.6 Bord and pillar with continuous miner working during development ... 3.1 Geo-mining details of the panel S-1 of NCPH Colliery, R-6 mine 3.2 During Widening of gallery width 4.5m to 6.00m 4.1 Summary of Convergence Observations 4.2 Observation of Load on supports

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Bord and Pillar mining by continuous Miner in HINDI - YouTube

Jul 29, 2016  Please watch: "Mines Act 1952 Video No 1 Committee With MCQ In HINDI " https://youtube/watch?v=USzxioNpomo-~-~~-~~~-~~-~-Bord and pillar is a...

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BORD AND PILLAR METHOD.pptx - Under Ground Mining Board ...

View Test Prep - BORD AND PILLAR METHOD.pptx from ENG 286 at Davidson College. Under Ground Mining Board and Pillar Method Branch : Mining and Min Surveying Engg. Presentation By :

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(PPT) CONTINUOUS MINER AND ROADHEADER Jatangi Anil ...

• CONTINUOUS MINER Presented by: JATTBABBU INTRODUCTION: A continuous miner is a mining machine that produces a constant flow of ore from the working face of the mine. Continuous miners are typically used in room and pillar mining operations. The continuous miner is different from conventional or cyclical mining methods, which halt the extraction process in order for ore-loading to

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CONTINUOUS MINERS

CONTINUOUS MINERS 1. Nirbhay Kumar Sinha Roll-2013MT0130 Branch-Mining Machinery Engg. ISM Dhanbad 2. INTRODUCTION : Continuous mineris a machine used for cutting and loading of coal used in underground Board and Pillar mining operation. The JOY continuous minerproduct line has been developed to meet the high productivity requirements of today's underground mining industry.

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coal mining process in ghana ppt

Coal Mining Process In Ghana Ppt. coal mining definition, history, types, facts britannica,the oldest of the basic underground methods, room-and-pillar mining grew naturally out of the need to recover more coal as mining operations became deeper and more expensive. during the late 1940s, conventional techniques began to be replaced by single machines, known as continuous miners, that ...

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Coal Mining - basics

1 Coal Mining - basics Coal Mining Methods Underground Bord Pillar Longwall Surface Open Cut Strip Open Pit Highwall Auger Continuous Highwall Miner Punch Bord Pillar Continuous Miner shuttle cars or continuous haulage Highly flexible, high cost – can handle geological variability 1.5-3m per pass, but can take up to 3 passes in good

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Hard-rock room and pillar mining best practice industry ...

definition; however, room and pillar mining as practised in the narrow reef hard rock mines in Southern Africa is not so simple. In recognition of the complexity of hard-rock room and pillar mining, the mining industry sponsors of the Centre for Mechanized Mining Systems at Wits University requested that the Centre design and facilitate a Best

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Mining

Coal cutting machine is used in bord and pillar mining method of underground coal mining to make Undercut, Overcut or Middlecut to provide free face for the blasting operation. Development by CCM: The headings are Undercut, Overcut or Middle Cut by a coal cutting machine and shot holes are then drilled and charged with explosives and blasted.

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Pillar Extraction using Continuous Miners Introduction ...

PILLAR EXTRACTION USING CONTINUOUS MINERS. Overview. 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. However, there are still mines and occasions where longwall mining is not suitable e.g.

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STRATA CONTROL TECHNOLOGY FOR MASS

3.6 Bord and pillar with continuous miner working during development ... 3.1 Geo-mining details of the panel S-1 of NCPH Colliery, R-6 mine 3.2 During Widening of gallery width 4.5m to 6.00m 4.1 Summary of Convergence Observations 4.2 Observation of Load on supports

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Underground Mining Methods and Equipment

methods and brief explanations of the techniques of room-and-pillar mining, sublevel stoping, cut-and-fill, longwall mining, sublevel caving, and block caving. The second section describes underground mining equipment, with particular focus on excavation machinery such as boomheaders, coal cutters, continuous miners and shearers. 1.

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Solved: QUESTION 1 How Is The Cutting Sequence In Bord And ...

QUESTION 1 How is the cutting sequence in bord and pillar mining, affected by the following factors: - Equipment, Cycle times, Production, Ventilation, and Industry standards. [15] QUESTION 2 On average, the continuous miners produced coal at a rate of 76 t per operating hour, which, at an average machine availability of 67%, resulted in a ...

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Room and pillar mining - Wikipedia

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. To do this, "rooms" of ore are dug out while "pillars" of untouched material are left to support the roof overburden.Calculating the size, shape, and position of pillars is a complicated procedure, and is an area of ...

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Bord Pillar Method Mining Coal

Basic parameters of bord and pillar mining system 1. Gallery (bord) 2. Pillar. 3. Junction. Calculation of percentage of extraction during development If coal from the full seam thickness is extracted, the percentage of extraction during development is nearly 20% in deep mines and 35% in shallow mines.

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Activity Based Costing: Challenging the way we cost ...

and blast, mechanized continuous mining, and mechanized longwalling. His analyses were based on the following assumptions: Seam height = 3 m Competent sandstone floor Coal roof Depth below surface = 90 m For continuous miner methods, bord widths = 6 m, and pillar centres = 18 m. He further specified that a producing colliery with

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DESIGN OF SUPPORT SYSTEM IN BORD AND PILLAR MINE

DESIGN OF SUPPORT SYSTEM IN BORD AND PILLAR MINE 1. DESIGN OF SUPPORT SYSTEM IN BORD AND PILLAR MINE A Project Report Submitted in partial fulfilment of requirements for award of dual degree of Bachelor of Technology and Master of Technology in Mining Engineering By Anurag kumar jha Exam Roll no.-511214025 SESSION 2016-2017 DEPARTMENT OF MINING

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Toward Pillar Design to Prevent Collapse of Room-and ...

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

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University of Wollongong Research Online

Mining commenced at Tasman Mine in late 2006. The current method of mining is bord and pillar using continuous miner-bolters and shuttle cars for first workings and secondary extraction using breaker line supports. The two stage process was chosen to accommodate irregular shaped coal

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Hard-rock room and pillar mining best practice industry ...

definition; however, room and pillar mining as practised in the narrow reef hard rock mines in Southern Africa is not so simple. In recognition of the complexity of hard-rock room and pillar mining, the mining industry sponsors of the Centre for Mechanized Mining Systems at Wits University requested that the Centre design and facilitate a Best

Read More
Pillar Extraction using Continuous Miners Introduction ...

PILLAR EXTRACTION USING CONTINUOUS MINERS. Overview. 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. However, there are still mines and occasions where longwall mining is not suitable e.g.

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Bord and Pillar Coal Cutting Machine ~ Mining

Jan 22, 2014  Coal cutting machine is used in bord and pillar mining method of underground coal mining to make Undercut, Overcut or Middlecut to provide free face for the blasting operation. Development by CCM: The headings are Undercut, Overcut or Middle Cut by a coal cutting machine and shot holes are then drilled and charged with explosives and blasted.

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Room-and-pillar mining - Conservapedia

Jul 13, 2016  Room-and-pillar mining. Room-and-pillar mining is the most common type of system for mining coal. In this system, the mine roof is supported mainly by coal pillars left at regular intervals. Rooms are places where the coal is mined; pillars are areas of coal left between the rooms. Room-and-pillar mining is done either by 1) conventional mining ...

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Underground Mining Methods and Equipment

methods and brief explanations of the techniques of room-and-pillar mining, sublevel stoping, cut-and-fill, longwall mining, sublevel caving, and block caving. The second section describes underground mining equipment, with particular focus on excavation machinery such as boomheaders, coal cutters, continuous miners and shearers. 1.

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New Technology – Technical Review - Home Home

Dec 01, 2004  • Mining layout • Bord-and-pillar mining • 6 x 12m bords ideal for this equipment and fit perfectly with the mining cycle • Cycle • drill 2/Clean 2/Support 2 bords per shift • Production • target – 1 890 ca/month double shift • achieved – 700 ca/month 1st double shift • currently in use at 12#

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Solved: QUESTION 1 How Is The Cutting Sequence In Bord And ...

QUESTION 1 How is the cutting sequence in bord and pillar mining, affected by the following factors: - Equipment, Cycle times, Production, Ventilation, and Industry standards. [15] QUESTION 2 On average, the continuous miners produced coal at a rate of 76 t per operating hour, which, at an average machine availability of 67%, resulted in a ...

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Bord Pillar Method Mining Coal

Basic parameters of bord and pillar mining system 1. Gallery (bord) 2. Pillar. 3. Junction. Calculation of percentage of extraction during development If coal from the full seam thickness is extracted, the percentage of extraction during development is nearly 20% in deep mines and 35% in shallow mines.

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Study Material Mine Portal - India's No.1 Mining Exams ...

Description Of Indian Coalfields. Nature And Occurence Of Coal Seams. Reserves Resource Terminology. Boring Methods. Bord Pillar Method Of Working. Contiguous Working. Underground Method Of Mining. LONGWALL MINING. Thick Seam Mining.

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FIRST WORKINGS – Mining Science and Technology

First workings are conducted for two main reasons: To develop the pillars, bords and/or panels to enable their subsequent extraction, and. To develop multiple main entries for access to the coal reserves. These entries are supported in the long term by the pillars consequently formed. The number of development headings driven in any area of ...

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AGM Presentation Colin Randall Managing Director

“That through automation of the transport from the continuous miner to the conveyor belt, automatic cutting cycles on the continuous miner as well automatic drillable roof bolts, that a bord and pillar non-subsidence mining method can permit the economic mining of underground thermal coal when mining

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