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A Global Overview of the Schemes of Extraction of Pillars in Major Coal Producing Countries


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1 Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad - 826004, India;, India

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Seams amenable to opencast mining is on the verge of exhaustion globally and to meet the future demand of coal, underground mining method is the only viable technique left. In India, also quite a large number of coal seams have been extensively developed and standing on pillars for a long time. Extraction of these standing pillars with reasonable safety has been a challenge to mining engineers for most of reasons. Presently, depillaring in Indian mines is mostly carried out through cyclic unit operations involving drilling, blasting, loading with either a Side Discharge Loader (SDL) or a Load Haul Dumper (LHD), transport and hauling. Fully mechanized depillaring panels are limited in number. Mechanized depillaring using continuous miner and shuttle car is being used in a few mines in India with a view to achieving bulk production and high productivity. Still we are far behind with our Output per Man Shift (OMS), to a tune of 2.01 compared to the global OMS of 12 tonnes per man-shift in depillaring districts. Different strata, along with hostile geo-mining factors, are considered to be this prime case of low productivity. This paper seeks to highlight the existing depillaring practices in India and other major coal-producing countries namely USA, Australia and South Africa. The authors also present a case study on conventional depillaring practice in the Indian context and a few methods being practiced in major coal-producing countries.

Keywords

Bord and Pillar, Coal Pillar, Depillaring, Underground Mining
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  • RK Sinha. Influence of in-situ stress on design of layout and support in bord and pillar workings, IIT ISM, Dhanbad.2013.

  • R Singh, PK Mandal, AK Singh, TN Singh. Cable-boltingbased semi-mechanised depillaring of a thick coal seam. Int. J. Rock Mech. Min. Sci. 2001; 38:245-257. https://doi. org/10.1016/S1365-1609(00)00075-7

  • R Kumar, AK Singh, AK Mishra, R Singh. Underground mining of thick coal seams, Int. J. Min. Sci. Technol. 2015; 26:4-7. https://doi.org/10.1016/j.ijmst.2013.01.014

  • R Singh, AK Singh, PK Mandal, R Kumar, O Singh, J Buragohain. A novel method for underground extraction of a critically thick coal seam standing on pillars and the development made along the roof horizon. Minetech. 2002; 23:3-11.

  • R Singh, R Kumar. Pillar stability during underground mining of the complete thickness of a thick coal seam in a single lift - Indian experiences, in: 1st Canada-US. Rock Mech. Symp. 2007. https://doi.org/10.1201/NOE0415444019-c181

  • AK Singh, R Singh, J Maiti, R Kumar, PK Mandal. Assessment of mining induced stress development over coal pillars during depillaring, Int. J. Rock Mech. Min. Sci. 2011; 48:805-818. https://doi.org/10.1016/j.ijrmms.2011.04.004

  • RK Sinha, M Jawed, S Sengupta. Influence of rock mass rating and in situ stress on stability of roof rock in bord and pillar development panels. Int. J. Min. Miner. Eng. 2015; 6:258-275. https://doi.org/10.1504/IJMME.2015.071175

  • PK Mandal, AK Singh, J Buragohain, R Singh. A novel method of mining for underground winning of contiguous section of a coal seam under fragile parting. J. Mines Met. Fuels. 2002; 50:25-33.

  • M Jawed, RK Sinha. Design of rhombus coal pillars and support for Roadway Stability and mechanizing loading of face coal using SDLs in a steeply inclined thin coal seam a technical feasibility study. Arab. J. Geosci. 2018; 11:415.https://doi.org/10.1007/s12517-018-3747-4

  • K Das, GS Kumar. Optimum extraction of pillars by FLAC-3D where surface features is the major constrain, in: ISRM Reg. Symp. 2014, London. 2014; pp. 591-595. https:// doi.org/10.1201/b16955-101

  • BP Verma, S Prasad, BB Dhar. Blasting gellery method and its support design - a critical analysis proceding of international, Symp. Thick Seam Mining, CIMFR, Dhanbad, India. 1992; 471-492.

  • RR Singh, AK Singh, J Maiti, PK Mandal, RR Singh, R Kumar. An observational approach for assessment of dynamic loading during underground coal pillar extraction. Int. J. Rock Mech. Min. Sci. 2011; 48:794-804. https:// doi.org/10.1016/j.ijrmms.2011.04.003

  • PK Mandal, AJ Das, N Kumar, R Bhattacharjee, S Tewari, A Kushwaha, P Kumar, A Jyoti, N Kumar, R Bhattacharjee, S Tewari and A Kushwaha. Assessment of roof convergence during driving roadways in underground coal mines by continuous miner. Int. J. Rock Mech. Min. Sci. 2018; 10:169-178. https://doi.org/10.1016/j.ijrmms.2018.06.001

  • PK Mandal, AK Singh, S Ram, AK Singh, N Kumar, R Singh. Strata behaviour investigations of Indias first depillaring face with continuous miner and shuttle car. Minetech. 2004; 25:03-12.

  • S Sengupta, RKK Sinha, DS Subrahmanyam, D Joseph, Sengupta S, RKK Sinha. Investigation in to the Causes of Severe Roof Problems in Some Indian Coal Mines and Formulation of Guidelines to Reduce Ground Control Problems. Int. J. Min. Miner. Eng. 2011; 3:290-302. https:// doi.org/10.1504/IJMME.2011.045471

  • RK Sinha. Influence of in-situ stress on design of layout and support in bord and pillar workings, Indian Institute of Technology (Indian School of Mines), Dhanbad, India.2013.

  • RK Sinha, M Jawed, Sengupta S. Influence of Anisotropic Stress Conditions on Design of Development Workings in Bord and Pillar Mining, ISRM India Journal- Half Yrly. Tech. J. Indian Natl. Gr. ISRM. 2013; 2:16-24.

  • R Singh, AK Singh, PKP Mandal, R Kumar. Rock Mechanics Considerations for the Success of Mechanised Coal Pillar Extraction in India. ISRM Int. Symp. 2010 6th Asian Rock Mech. Symp. Rock Eng. 2010; 23-27. http://www. onepetro.org/mslib/servlet/onepetropreview?id=ISRMARMS6-2010-138.

  • RK Sinha, M Jawed, S Sengupta. Design of support system in depillaring panel using numerical modeling - A case study. Intrenational J. Earth Sci. Eng. 2015; 8:6.

  • M Saharan, PK Palit, K Rao. Desinging coal mine development galleries for room and pillar mining for continuous miner operations - Indian experience, in: 2012 Coal Oper. Conf., The University of Wollongong, Australia. 2012; pp.154-162.

  • GH Lind. Key success elements of coal pillar extraction in New South Wales, J. South. African Inst. Min. Metall. 2002; 102:199-205.

  • C Mark. Overview of Ground Control Research for Underground Coal Mines in The United States, Pittsburgh USA, 2002.

  • SP Mathur, NK Singh. Coal mining and management. Volume-II, n.d.

  • DGMS, Coal Mines regulations. 2017. http://www.fameindia.gov.in/ViewNotificationDetails.aspx?RowId=22.

  • RK Sinha. Hydraulic fracturing for in situ stress measurement and its application in the design of underground structures in Rock - few case studies, in: Keynote Address Curr. Pract. Min. Allied Ind., Keonjhar, India, 2018.

  • C Mark, JC Zelanko, MT Hoch, F Chase. Evaluation of pillar recovery in southern west virginia, Pittsburgh USA.2002.

  • World coal Association, Coal mining, World Coal Assoc. 2019; 1-8. https://www.worldcoal.org/coal/coal-mining.

  • S Shihua. Col-Mining Technology in China. 1986.

  • I Marshal Miller and Associates, Retreat mining practices in Kentucky: A comprehensive analaysis of retreat mining operations in Kentucky including regulations, safety practices, and operator reporting, Repot prepared by, Kentucky, USA, 2006.

  • SS Peng. Understanding the chinese coal industry, Coal Age. 2010:1-17. https://www.coalage.com/features/understanding-the-chinese-coal-industry/.

  • L Lien. Advances in coal mining technology, in: Room Pillar Min., 2013. https://doi.org/10.1533/9780857097309.2.193

  • E Ghasemi, M Ataei, K Shahriar, F Sereshki, SE Jalali, A Ramazanzadeh, S Esmaeil, SE Jalali, A Ramazanzadeh. Assessment of roof fall risk during retreat mining in room and pillar coal mines, Int. J. Rock Mech. Min. Sci. 2012; 54:80-89. https://doi.org/10.1016/j.ijrmms.2012.05.025

  • FE Chase, C Mark, KA Heasley. Deep cover pillar extraction in the US coalfields, in: Proc. 21th Int. Conf. Gr. Control Mining, Morgantown, West Virginia Univ. USA, 2002; pp. 69-80.

  • C Mark, CZ Joseph. Sizing of final stumps for safer pillar extraction, in: 20th Int. Conf. Gr. Control Min.,

  • Morgantown: West Virginia University, USA. 2001; pp. 59-66.

  • S Ram. A study of roof pillar interaction for an efficient breaker line design during mechanised depillaring., Indian Inst. Technol. (ISM), Dhanbad. 2016; 24:50-170. https:// doi.org/10.1145/2505515.2507827

  • G Lind. An integrated risk management approach for underground coal pillar extraction in South Africa. J. South African Inst. Min. Metall. 2005; 105:137-147.


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  • A Global Overview of the Schemes of Extraction of Pillars in Major Coal Producing Countries

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Authors

Sikandar Kumar
Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad - 826004, India;, India
Rabindra Kumar Sinha
Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad - 826004, India;, India
Mohammad Jawed
Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad - 826004, India;, India

Abstract


Seams amenable to opencast mining is on the verge of exhaustion globally and to meet the future demand of coal, underground mining method is the only viable technique left. In India, also quite a large number of coal seams have been extensively developed and standing on pillars for a long time. Extraction of these standing pillars with reasonable safety has been a challenge to mining engineers for most of reasons. Presently, depillaring in Indian mines is mostly carried out through cyclic unit operations involving drilling, blasting, loading with either a Side Discharge Loader (SDL) or a Load Haul Dumper (LHD), transport and hauling. Fully mechanized depillaring panels are limited in number. Mechanized depillaring using continuous miner and shuttle car is being used in a few mines in India with a view to achieving bulk production and high productivity. Still we are far behind with our Output per Man Shift (OMS), to a tune of 2.01 compared to the global OMS of 12 tonnes per man-shift in depillaring districts. Different strata, along with hostile geo-mining factors, are considered to be this prime case of low productivity. This paper seeks to highlight the existing depillaring practices in India and other major coal-producing countries namely USA, Australia and South Africa. The authors also present a case study on conventional depillaring practice in the Indian context and a few methods being practiced in major coal-producing countries.

Keywords


Bord and Pillar, Coal Pillar, Depillaring, Underground Mining

References





DOI: https://doi.org/10.18311/jmmf%2F2022%2F32292