tion of thick seams as well as developed pillars in thick seams in India. It is a variant of the bord and pillar method of mining. Safe and efficient underground extrac-tion of coal pillars under competent roof strata needs information about amount and nature of the mining induced vertical stress over pillars in and around the Blasting

Increasing Production Time in Continuous Mining Methods EE Dorey D McGinness SYNOPSIS The use of continuous miners in a conventional bord and pillar section results in a considerable amount of unproductive time. This is due to the roof support requirements, continuous miner configurations, and shuttle car 'change-outs'. These factors have

Kajora Area (India) ... (5&6 pit) unit was working Sonachora (R-VIIIB) seam by manual bord and pillar mining method. Depillaring with stowing is going on. The 7&8 pit unit was also working Sonachora seam (R-VIIIB) by semi-mechanized bord and pillar method with SDL. Only development work was going on.

bord-and-pillar mining in narrow tabular steep dipping orebodies will depend on the extent of the research and development efforts which need to create and innovate technologies to overcome some of the current limitations stated in the above-mentioned parameters.

thick seams worked with bord and pillar mining methods is presented. A mine located in India which has a 22 year history of working a 10m thick coal seam with the blasting gallery (BG) technology for extraction of the pillars was selected for the study. The project investigated

working height, leaving the pillar core as a natural support to the roof. Over 45% overall large percentage of the total coal reserves in India. The prevailing method of bord and pillar mining was inadequate as recovery was low and required stowing with sand not easily available in …

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 ...

TOWARD PILLAR DESIGN TO PREVENT COLLAPSE OF ROOM-AND-PILLAR MINES R. Karl Zipf, Jr. ... Room-and-pillar mining accounts for a significant portion of the total mineral production in the United States ... from India (Sheorey et al., 1995) and Australia (Galvin,

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.

offers a wide range of extremely productive and reliable continuous miner cutting tools for bord and pillar mining. Cutting tools for roadheaders and miners. has a wide selection of highly productive conical mining tools for roadway development …

Apr 09, 2016· Most of the bord and pillar method of coal mining has been done in depth range less than 300 m as at greater depths pillars experience crush. However, in India in some cases the depth of mining for bord and pillar method has been around 600 m, though mining at such depths is beset with the problems of strata control.

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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 ...

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 - Newest Crusher, Grinding Mill . bord and pillar mining Room and pillar mines, Mining Techniques, Underground Mining, . Room and pillar is also known as bord and pillar is a mining system in which the mined material is taken out across a horizontal plane while leaving pillars …

Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal underground, with room-and-pillar being the traditional method in the United States. Both methods are well suited to extracting the relatively flat coalbeds (or coal seams) typical of

Coal India: Chairman's Speech, Reports of Coal India NDTV. To augment underground production, semi–mechanised Bord and pillar mining with Load Haul Dumper (LHD)/Side Discharge Loader (SDL) loading with continuous coal evacuation system are being planned.

Feb 27, 2016· One of such methods is the Bord and Pillar method of mining. 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.

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

mining include Longwall mining and Bord and Pillar method of mining. The method mostly prevalent in the Indian underground mines is the Bord and Pillar method of mining because of its history and ease of operation. The most important aspect of Bord and Pillar mining is the design of pillars. The design of

Investment / Cooperation Opportunity in India ¾Development of UG projects with Longwall / mass production technology. ¾Extraction of Pillars by Longwall / Shortwall tech. ¾Manufacturer of spare parts for mining equipment in India ¾Technology for deep shaft sinking ¾Clean coal technologies: ¾UG Coal gasification ¾Coal liquefication ¾Setting up of washery

Bord And Pillar Mining India Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc.

EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL COAL MINES ... Generally for Indian mines, the proposed safety factor is 1.5-1.8. A correlation between safety factor ... 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 ...

Depillaring of Coal and Mine Roof Supports. ... out that bord-and-pillar mining is the most important method of coal extraction in South African underground coal mines, and advocates that pillar ...

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 ...

Bord And Pillar Mining India - caesarmachinery.com. Home >News > Bord And Pillar Mining India Bord And Pillar Mining India Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc. Get Price

•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.

1 Department of Mining Engineering, National Institute of Technology Rourkela 769008, Odisha, India, tel. +919 437 943 121 e-mail: [email protected] 2 e-mail: [email protected] Abstract Roof fall is one of the major problems of the bord and pillar coal mines during the depillaring phase. Roof