The document discusses different methods of surface coal mining including opencast mining. It describes the main pieces of heavy equipment used in surface coal mining operations, focusing on draglines. Draglines are large excavators suited for mining thick coal seams in areas with gentle slopes. The document provides details on different dragline working methods and specifications for draglines used at two example mining sites in India. Production statistics comparing digging and rehandling volumes for the two draglines over multiple years are also presented.

7. SHOVEL + DUMPER

9. SURFACE MINER

11. BUCKET WHEEL EXCAVATOR

13. DRAGLINE

15. Simple Casting

16. Extended Bench Method S.No D/L Position Excavating Cut Area m 2 (solid) Dump 1 P-1 1 st Dig D’A’B’CFF’RST 480+192 YRQOU

17. Extended Bench Method with cast Blast

18. Horse Shoe Method D/L Position Operational position Excavation Cut Area m 2 (solid) Dump 26M/81 R Main Bench Position (MBP) 1 st Dig ABCDEFGH 280+904 MPQRIS’SU Spoil Bench Position (SBP) 1 st Dig IJKL 332 Rehandle QPIS’ST+VV’NN’ 513+17+152 MNOVWW’X’XY

19. Continuous Bench Two pass Method

20. Tandem Working of Draglines D/L 10/70 is 150-200m ahead of D/L 20/90 Dragline Cut Dump Area m 2 (solid) 10/70 ABCD abcd 285.0 20/90 CDEF (Dig) kmnofci 570.0 Ijkl (R.H.) 9.6 Ebf (R.H.) 1.0

21. Draglines in vertical tandem

22. Draglines in vertical tandem

24. Technical specifications of Dragline (24 x 96) - Boom length : 74 - 95 m - Boom angle : 30° - 38° - Bucket Capacity (nominal): 26 - 34 cu m - Dump height : 38 - 40 m - Digging depth : 44.3 - 53.4 m - Operating radius : 64.6 - 88.2 m - Walking speed : 0.24 kmph - Bearing Pressure : 0.95 kg/cm 2

25. SPECIFICATIONS OF OC-I DRAGLINE MAKE Ranson & Rapier Bucket Capacity M 3 24 Annual capacity mm 3 3.31 Boom Length Mtrs 95.6 Operating Radius Mtrs 88 Dumping Height Mtrs 39.6 Base Dia Mtrs 16 Shoe Length Mtrs 17 Shoe Width Mtrs 2.8 Movement of Machine Mtrs 2.2 Weight of Machine Tonnes 2000 Total H.P H.P. 3500

26. Specifications of OC-III Dragline Make BEML-MARION Model 7820 WORKING RANGE Boom Length Feet 275 275 275 Pitch Dia Inches 90 90 90 Boom Angle Degrees 30 34 38 Dumping Radius Feet 262 251 240 Dumping Height Feet 102 118 134 Depth Feet 160 144 125 BASE Outside Dia-Nominal Feet 50 55 Bearing Area Sq.ft 1965 2380 Bearing Pressure Psi 14 11.5

27. Production performance All figures in L.Cu.M. Year OC-I Dragline OC-III Dragline OB OB OB OB OB OB digging rehandling total digging rehandling total DOC 26/11/1986 10/9/1994 1995-96 29.94 11.77 41.71 25.96 14.00 39.96 1996-97 32.07 12.55 44.62 24.56 13.33 37.89 1997-98 29.48 13.44 42.92 24.70 15.14 39.84 1998-99 26.14 9.77 35.91 21.98 11.20 33.18 1999-00 27.11 11.98 39.09 32.01 8.87 40.88 2000-01 29.23 14.17 43.40 33.80 10.81 44.61 2001-02 28.62 12.60 41.22 32.50 11.14 43.64 2002-03 29.02 12.56 41.58 32.10 10.24 42.34 2003-04 21.84 9.26 31.10 28.91 13.21 42.12 2004-05 21.95 11.01 32.96 28.98 12.21 41.19

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