Bord and Pillar mining by continuous Miner in HINDI - YouTube
Jul 29, 2016 · Bord and pillar is an underground mining method for extracting coal from belowground of earth. Various machinery combinations are used for extracting. One of the combination is the continuous ...
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 method predominates are Australia, The USA and South Africa.
Productivity Improvement in Underground Coal Mines - A ...
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.
Longwall Mining - an overview | ScienceDirect Topics
At present, production by longwall mining accounts for a minor amount of total underground mining production with the majority coming from bord-and-pillar methods. Since it is envisaged that longwall mining will require time to become established in India, bord-and-pillar methods will continue to be dominant in the foreseeable future. Thus, it is necessary to apply new technologies to existing …
MINING METHODS T - scienceandtech.cmpdi.co.in
Conventional bord and pillar mining in thick seams is associated with very low percentage of extraction [around 30% in a panel] even under favourable conditions. Extensive development of pillars carried out earlier in thick seams had also resulted in large reserves of good quality coal locked up in developed bord and pillar workings [over 2,500
Criteria for selection of Board and pillar for multiple seams
Nov 06, 2016 · In India, about 98% of underground output of coal is obtained by Board and Pillar method and barely about 2% by longwall methods. The other countries where Board and Pillar method predominates are Australia, The USA and South Africa. 5. Page | 4 FIGURE3: BOARD AND PILLAR PANEL LAYOUT Classification of Bord and Pillar Mining System 1.
Room and pillar mining - Wikipedia
Room and pillar mining was one of the earliest methods used, although with significantly more man-power. The room and pillar system is used in mining coal, gypsum, iron, and uranium ores, particularly when found as manto or blanket deposits, stone and aggregates, talc, soda ash and potash.
Bord-and-pillar mining in inclined orebodies
Bord-and-pillar mining in inclined orebodies Reduce mining costs by increasing the production tonnage and reducing production costs with the effective mechanized drilling and cleaning method Increase the underground labour efficiency (tons extracted per employee) Adhere to …
(PDF) Depillaring of Coal and Mine Roof Supports
Depillaring of Coal and Mine Roof Supports. ... COAL MINING: INDIAN PERSPECTIVE ... The stone points out that bord-and-pillar mining is the most important method of coal extraction in South ...
A case study illustration of the layout and support in an ...
The mine there is being worked by Bord and Pillar method in which continuous miners are being used as the main equipment for extracting coal. The Pillar size which is being kept for support of the overburden pressure is 35 m x 35 m, 40 m x 40 m and 40 m x 35 m. The depth of cover above the seam varies between 220 m to 400 m.
Bord & Pillar Method | Mining | Coal
After the headings reach a certain line or boundary or after complete development of the mine leasehold, coal pillars formed are extracted for complete removal of coal. This stage of extraction of coal from the pillars or reduction of coal pillars is known as depillaring. Basic parameters of bord and pillar mining system 1. Gallery (bord) 2 ...
% of extraction- board & pillar mining- part I - YouTube
Jul 30, 2019 · here in this video we have discussed the numericals on PERCENTAGE OF EXTRACTION in Board and Pillar Mining. Bord and pillar mining method comprises two phases i.e DEVELOPMENT and DEPILLARING.
bord and pillar mining equipment - rodiziogrill.be
Bord And Pillar Mining India Prompt : Caesar is a famous mining equipment manufacturer wellknown both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc.
(PDF) Underground Mining Methods: Room and Pillar method
Underground Mining Methods: Room and Pillar method ... Characteristics of R & P method in non-coal applications R & P classic Step mining Post-pillar mining Configuring the R & P method in coal ...
COAL MINING TECHNOLOGY - e-library WCL
•Bord & Pillar is the traditional mining method used in India. •It is employed where geo-mining conditions are complex. •Coal is removed from the coal faces initially by developing a set of galleries leaving pillars in between to support the roof. •Thereafter, the pillars are extracted by de-pillaring.
Characterization of coal mine panels in bord and pillar ...
of the mines in India are worked by the bord and pillar method of mining, our model has been designed for this method to serve a maximum number of mines. Among the systems of extraction in the bord and pillar method, depillaring with formation of small pillars as final operation, extraction by broadening galleries, depillaring with hydraulic
UNDERGROUND COAL MINING: FACTORS, COST, AND TIME ...
• Pillar sizes will generally range from 30 to 100 feet and have a rectangular configuration • Extraction Ratio is the ratio of coal removed compared to estimated in-place tonnage – normal extraction ratio is from 35 to 55% – retreat mining will result in extraction ratios of up to 70%
Coal Mining Methods
pillar mine, several stages of mining occur simultaneously in different rooms. A final phase of mining termed “retreat mining” may be performed to recover additional coal by extracting pillars and allowing the roof to fall. However, this is a complex procedure that requires additional planning. Advantages of Longwall Mining
Bord-and-pillar | Definition of Bord-and-pillar by Merriam ...
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 …