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 method predominates are Australia, The USA and South Africa. The key to the …
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 along with the quadbolter, shuttle car and LHD's. The continuous miner accounts about 45% of underground ...
Mar 24, 2013· 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 (tail-gate …
Longwall mining has been extensively used as the final stage in mining old room and pillar mines. Longwall has better resource recovery (about 80% compared with about 60% for room and pillar method), fewer roof support consumables are needed, higher volume coal clearance systems, minimal manual handling and safety of the miners is enhanced by the fact that they …
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 under-ground coal production over the years with more emphasis on opencast mining.
THE TRADITIONAL WONGAWILLI METHOD. Problems encountered with the Old Ben system prompted the design of Wongawilli system of Pillar extraction, and the following parameters were set: 1. Provision of a single working place 2. Extraction of coal in stress relieved areas 3. Utilisation of the coal in stress as a support 4.
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The mining method is a mechanized bord and pillar layout, which will yield a total of 185 000 ... conveyor decline system developed from surface as well a chairlift decline for man transport. The conveyor/ service ... mechanized room and pillar stoping method. A mining section consists of eight 12 m rooms, with pillar sizes
Jul 14, 2021· Disadvantages of bord and pillar method :-. Ventilation is sluggish as compared to longwall Method at the working places. The extraction losses are generally higher than in other methods of mining. Work is carried on at a number of …
Dec 17, 2019· Hi everyone, In this video we are discussing about the underground mining method, basically what is bord and pillar mining method, wha...
Pillar Strength and Design Methodology for Stone Mines Gabriel S. Esterhuizen, Sr. Research Engineer Dennis R. Dolinar, Lead Research Engineer John L. Ellenberger, Lead Research Scientist NIOSH-Pittsburgh Research Laboratory Pittsburgh, PA ABSTRACT Underground stone mines in the United States make use of the room-and-pillar method of mining.
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One of the oldest method of mining is Bord and Pillar. It is method in which the mined material is extracted across horizontal plane while leaving pillars of untouched material to support the overburden leaving open areas or "rooms" underground. In a method of depillaring, known as the caving of coal of åe p&rs extracted and thc roof is ...
strata for safe mining conditions. More than 3000 million tons of coal reserves are locked up in the form of coal pillars in India. Varying geo-mining conditions make it extremely difficult to extract more than 30 percent of the total coal reserve by Bord-and-pillar method, which is again the most popular method adopted in India.
Mining method and equipment 4.2.1 General The bord and pillar mining layout will be maintained because of its reliability, flexibility, low capital cost, low working costs and large skills source availability (Woodruff, 1966). Increasing mechanization has resulted in an increasing production in the amount of the fine coal
Mining, being one of the earliest human endeavors, and its evolution are inextricably linked to cultural advancement. Mining is the cradle of all other businesses. Different strategies have been approached for mining effectiveness while keeping output and safety in mind. The Bord and Pillar method of mining is one among them.
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. 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.
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 …
EXTENDIBLE CONVEYOR. 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 the continuous miner enable ...
The method of extraction for these areas is by conventional underground bord and pillar mining methods. The mining system includes: - Multiple seam mining – first workings or non caving partial pillar extraction systems where multiple seams are to be mined; and - Single seam mining – first workings, partial pillar extraction or wide panel ...
• Mining to be undertaken as bord and pillar (first workings) and pillar extraction (second workings) using a continuous miner, with panels being between 40 and 100 metres (m) wide; and • 2 million tonnes of ROM coal. Mining Methods • Area 2 – previously mined using bord and pillar extr action, would be mined using
Longwall Mining (41) Overview (6) Equipment (17) Shearer (8) Powered Supports (3) Ventilation (3) Change Out (7) Ground Control (8) Bord & Pillar (15) Method (7) Traditional Pillar Extraction (2) Panel & Pillar Extraction (2) Modern Pillar Extraction (2) Equipment (5) Ground Control (1) Ventilation (2) Rock Bolting (20) Overview (2) Types of ...
HARD-ROCK ROOM AND PILLAR MINING BEST PRACTICE INDUSTRY WORKSHOP 231 Introduction ... although rock bolting method were addressed in some detail. ... sizes, panels per section, numbers of strike conveyors per section, pillar geometry, size and frequency of roof bolt installation, overall face shape, decline development rate
OPEN ENDED LIFTING. Traditional Pillar Extraction 0 Comment. In this method a succession of drives is made down the goaf side or sides of the pillar (picture). Roof support for the drives is by rows of breaking-off propos placed along the goaf sideand with or without cross timber to support the immediate roof of the place.
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."
Success of Continuous Miner in Bord and Pillar Method May 2013 Conference: Geomine Tech Symposium on New Equipment- New Technology Management and Safety in Mining and Mineral Based Industries- 2013
May 31, 2017· Bord-and-pillar mining is used in first workings of a deposit, and when irregularly shaped deposits, or sensitive environmental conditions, call for a …
Underground Mining There are two main methods of underground mining: • Room and Pillar (also known as bord and pillar mining) • Longwall mining Room and Pillar Mining This method uses continuous miners to cut a network of 'rooms' into the coal seam, leaving behind pillars of coal to support the roof of the mine.
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.
After pillars have been formed on the bord and pillar system, consideration has to be given to the extraction of coal from the pillars; the operation is known as pillar extraction. ... Improper mining methods that create localized extensive stress concentration. ... In Raniganj field some mines using conveyors in depillaring district have ...