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New Technology and Challenges for Underground Coal Mining

B.N. Basu Director (CRD) CMPDI. सी एम पी डी आई एक मिनि रत्न कंपनी Cmpdi (A Miniratna company). New Technology and Challenges for Underground Coal Mining. Coal Production from underground Coal Mines. Coal mining is carried out by Surface or ‘opencast’ mining

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New Technology and Challenges for Underground Coal Mining

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  1. B.N. Basu Director (CRD) CMPDI सीएमपीडीआई एकमिनिरत्नकंपनी Cmpdi (A Miniratna company) New Technology and Challenges for Underground Coal Mining

  2. Coal Production from underground Coal Mines • Coal mining is carried out by • Surface or ‘opencast’ mining • Underground or ‘deep’ mining • Around 60% world coal production comes from underground mining • India emerged as the largest coal producer in the world after China and USA, producing about 9% of the total global production • From U/G China USA and India produce about 95%, 33% & 10% respectively

  3. Trend Coal Production from CIL mines (1974-75 to 2011-12)

  4. Different Mining Methods used in CIL UG mines • Conventional Bord & Pillar (B&P) system with manual loading of coal onto tubs. • Semi-mechanised B&P system with loading by Side Discharge Loaders (SDLs) or Load Haul Dumpers (LHDs) or mechanised drilling by Universal Drilling Machines (UDMs). • Mechanised Bord & Pillar/ Room & Pillar system with Continuous Miners (CMs). • Mechanised Powered Support Longwall (PSLW) mining system. • Methods with hydraulic stowing technology in conjunction with sand or alternative filling. • Special methods (i.e. site specific methods), like Blasting Gallery (BG) method, Cable bolting method, wide-stall method, steep mining methods, etc.

  5. 0.32, 1% 1.79, 5% 0.18, 0% 3.54, 9% 0.15, 0% 0.1, 0% 32.31, 85% B&P Intermediate technology Roadheader (LW Dev.) PSLW Shortwall (in B&P) Highwall Mining Continuous Miner Conventional B&P (& Others) Technology-wise Underground Coal Production in CIL (2011-12)

  6. Application of Mass production Technologies • Continuous Miner Technology (Bord/Room & Pillar) • Powered Support Longwall Technology

  7. Continuous Miner technology presently in operation in CIL mines • Jhanjra, ECL – Joy Continuous Miner • Sarpi, SECL – Joy Continuous Miner • Tandsi, WCL - Joy Continuous Miner • Kumberkhani, WCL- Sandvik LCCM • NCPH, Chirimiri, SECL- Joy Continuous Miner • Sheetaldhara-Kurja, SECL- Bucyrus Continuous Miner • Pinoura, SECL- Bucyrus Continuous Miner • Rani Atari- Sandvik LCCM

  8. Continuous Miner technology proposed in CIL mines • Jhanjhra, ECL- MOU has been signed • Tilaboni, ECL - Under tendering • Kottadih, ECL- Under tendering • Block-II, BCCL- LOA has been issued • Lohapatti, BCCL- Bids under scrutiny • Saoner-I,WCL- Under re-tendering • Churcha, SECL- LOA has been issued for two sets

  9. Continuous Miner

  10. Shuttle Car & Quad Bolter

  11. Proposed Power Support Longwall Technology (PSLW) in CIL mines • Jhanjhra, ECL- Agreement has been signed • Moonidih seam XVI, BCCL- Bids under scrutiny • Moonidih seam XV, BCCL- LOA has been issued • Muraidih, BCCL- Agreement has been signed with L1 • Kapuria, BCCL- LOA has been issued

  12. Shearer working at Longwall face

  13. Shearer Drum

  14. Powered Roof Supports (Two Legged)

  15. Challenges of Underground Mining in CIL mines • UG operations at shallow depth has given way to quarry or surface mining • Closure of number of underground mines due to exhaustion of coal reserve or losses • Reduction or stagnation in production due to attrition of workforce or natural retirement • Reduced production and productivity due to old, long & arduous mines • Low technological, R&D or skill-development input in underground mines • A number of underground mining operations or processes involve human effort or drudgery • Low productivity of manpower • Geological disposition and exploration of coal seams has also affected indirectly

  16. Other Constrains and challenges in U/G Mines • Size of the Mine / block • Geological Complexities and Exploration • Mine Approach & Development : high gestation period • Technological Development & Implementation • Absorption of Technology – Skill development • Strata Management & Control • Mechanization – Productivity Enhancement Needs • Equipment Supply & Maintenance – Vendor Development • Long & Arduous Travel / tramming routes – Man-riding / Material Supply • Mining hazards • Technological Gap – Focus on Specific R&D

  17. Renewed Focus on Underground Mining • Aiming from 10% to 30% coal production by 2030 • Introduction of Mass-production Technology in large scale • Sharing of specific technology with other countries • Focusing on Specific R&D projects

  18. Alternative Underground Coal Mining Technologies • Underground Coal Gasification • Coal bed Methane

  19. THANK YOU

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