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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 NIOSHPittsburgh Research Laboratory Pittsburgh, PA ABSTRACT Underground stone mines in the United States make use of the roomandpillar method of mining.
TOWARD PILLAR DESIGN TO PREVENT COLLAPSE OF ROOMANDPILLAR MINES R. Karl Zipf, Jr. Chief, Catastrophic Failure Detection and Prevention Branch ... Traditional strengthbased pillar design methods applicable to coal or hardrock mines use a ... Roomandpillar mining .
Abstract. Pillar extraction, (also referred to as retreat mining; pillar recovery; stooping; pillar robbing; and bord and pillar second workings) is the practice of forming a series of pillars and then partially or totally extracting some or all of the pillars, usually with mining operations retreating out of a panel. There are a number of basic pillar extraction methods, with numerous ...
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
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 ...
Bord and pillar mining method comprises two phases DEVELOPMENT and DEPILLARING. Sometimes both these phases proceeds simultaneously. 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.
Mining method and equipment 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 .
Bord And Pillar Mining Use Mechanised. A hybrid mining method is under consideration, which would result in a transition from the current higher volume, mechanised bordandpillar mining method Hybrid mining involves mechanised access drives using the mines current equipment as well as conventional manual methods for stoping.
In coal mining: Development of continuous mining .loading, developed in association with roomandpillar mining. The oldest of the basic underground methods, roomandpillar mining grew naturally out of the need to recover more coal as mining operations became deeper and more expensive.
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 (tailgate corner that is, probably ...
proven mining method in these conditions and has a lower risk operational failure. Bordandpillar mining has some favourable promises such as improving labour difficulties, lowering operating costs and providing safer working conditions. The success of mechanized bordandpillar mining in narrow tabular steep dipping orebodies
Bord and pillar mining – Coal and coal mining – Te Ara . ensp·enspBord and pillar mining Next. 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.
have been approached keeping in mind the production and safety. One of such methods is the Bord and Pillar method of mining. 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.
Oct 22, 2014· Room and Pillar Mining Method 1. Hassan Z. Harraz hharraz2006 2014 2015 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.
The Tcut mining method is basically a partial pillar extraction method. The pillar (13 m x 13 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. This method creates the required, higher extraction percentage and higher Run of
Feb 06, 2018· Bord and pillar method Applicability condition of Bord and pillar method Advantage and disadvantage of Bord and pillar method ... % of extraction board pillar mining part I Duration: 18:01 ...
Mining Methods. Bordandpillar; Summary: Wessels is an underground bord and pillar operation with a current capacity of approximately Mtpa of ROM production (100 per cent basis). Processing Technologies. Summary: Primary crushing of ore takes place underground, while secondary crushing forms part of the surface operations. ROM ore is ...
Feb 27, 2016· This method is sometimes called roomandpillar mining. This can be better understand with the help of follwing fig . 6. APPLICABILITY OF BORD AND PILLAR METHOD The Bord and Pillar method is adopted for working. 1. A seam thicker than m, 2. A seam free from stone or dirt bands.
At present, production by longwall mining accounts for a minor amount of total underground mining production with the majority coming from bordandpillar methods. Since it is envisaged that longwall mining will require time to become established in India, bordandpillar methods will continue to be dominant in the foreseeable future. Thus, it ...
The only way to achieve this is to reduce production costs by improving productivity, efficiency and the effectiveness of the equipment. This paper aims to identify the various factors and problems affecting the productivity of underground coal mines adopting the bord and pillar method of mining and to propose suitable measures for improving them.
May 31, 2017· Two main methods of extraction are used for underground coal mines in New South Wales: longwall and bordandpillar extraction. Bordandpillar extraction is the older of the methods.
Bordandpillar: Bordandpillar, or roomandpillar, is the oldest underground mining technique and was common in NSW before longwall mining began in the 1960s. This method uses a grid of tunnels and involves progressively cutting panels into the coal seam whilst leaving behind pillars of coal to support the mine. This method has been in ...
PDF | The paper points out that bordandpillar mining is the most important method of coal extraction in South African underground coal mines, and advocates that pillar design procedures should ...
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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