The document discusses mining methods and equipment used for underground coal mining using the bord and pillar method. It provides specifications for various mining equipment used including Load Haul Dumpers (LHDs), Side Discharge Loaders (SDLs), drilling machines, conveyors, haulage systems, and their capacities. Formulas are given to calculate production rates based on machine specifications and operating parameters.

1. Bord and Pillar
development/depillaring with
LHD/SDL

3. LOAD HAUL DUMPER

4. Applicability Condition
• Seam Thickness : more than 1.8m
• Average seam Gradient : up to 1 in 7
• Suitable for weak floor as compared to SDL
• Maximum speed 8-12 KMPH
• Suitable for long distance

5. • Headings of 4.8 m width is driven
• In a gallery auger holes are drilled in the middle
of the face upto 2m depth and shot holes are
drilled upto 1.8m depth.
• P1 type permitted explosive with instantaneous
type electric copper detonator is used.
• Coal is loaded by LHD on to chain conveyor which
in turn transfer coal to the belt conveyor.

9. Load Haul Dumper
Model : EIMCO ELECON 811 LHD
Bucket capacity : 1.37 tons
Electric Motor : 37.5 KW 550 V
Height : 1.95-2 m
Length : 6.30 m
Width : 1.5 m
Speed : 1st gear 3.8 KMPH
2ND gear 7.2 KMPH
3rd gear 12.2 KMPH

10. Model EIMCO ELECON 912E
• Bucket Capacity : 2.7 tons
• Electric Motor : 440 V 64.15 KW
• Height : 2.11 – 2.78 m
• Length : 7.55m
• Payload : 4000 kg
• Cable reel : 120 m

11. Caterpillar 243-5577 186-9278 243-6143 243-6224 157-3622
Bucket
capacity(m3)
2.4 2.8 3.1 3.4 2.4
Bucket width
over cutting
edge (m)
1.950 2.010 2.200 2.400 2.200
Overall height-
bucket raised(m)
4.23 4.30 4.30 4.30 4.30
Max dump
height(m)
3.548 3.529 3.531 3.529 3.577
Dump clearance
at max lift (m)
1.662 1.558 1.560 1.561 1.561
Digging depth
(mm)
26 36 34 36 36
Dump angle at
max lift(degree)
43 43 43 43 43
Reach (m ) 1.476 1.588 1.583 1.584 1.584
Overall width(m) 2.155 2.185 2.318 2.518 2.318

12. SIDE DISCHARGE LOADER

14. SDL SPECIFICATION
MODEL BUCKET
CAPACITY
OPERATING
WEIGHT
ELECTRIC
MOTOR
GROUNG
PRESSURE
TRAVELLING
SPEED
EIMCO
ELECON 625
2.032 tons 8.9 tons 48.5 KW 0.94 Kg/cm2 3.0 kmph
M412 1.35 tons 8.5-9 tons 55 KW 0.9 kg/cm2 2.6 kmph
EIMCO
ELECON 611
0.9 tons 9 tons 48 KW 0.96 kg/cm2 3.0 kmph

15. HAZEMAG TL 600 TL 800 TL 1200 TL 1500
Gross Loading
capacity (m3/h)
40-55 50-80 60-100 80-130
Weight of
machine
8.6 10.5 15.0 14.5
Bucket capacity 0.6 0.8-1.0 1.2 1.5
Travelling
speed(m/s)
1.2 1.2 1.4 1.4
Discharge
height(m)
1.7 2.6 2.45 2.4
Digging
depth(mm)
350 600 500 650
Drive capacity 55-63 55-63 63-90 63-90
Length of
machine
5.8 6.18 6.9 6.6
Width 1.2 1.32 1.4 1.7
Height (without
canopy)
1.3 1.5 1.8 1.7
Ground
pressure(N/cm2)
10.4 7.8 10.0 10.0

17. Radiant hydraulic face drilling machine
• Model : RMTL-HFD-1800 Jumbo drill
• Operating pressure : 70 to 100 bar
• Rotational speed : 400 to 600 rpm
• Drilling diameter : 27 to 43 mm
• Medium : DGMS recommended hydraulic oil
• Noise level : below 70 dB
• Approx weight : 12 to 14 kg

18. Atlas Copco face drill

19. Sandvick

20. Chain Conveyor
MODEL Motor Power
(KW)
Capacity (tph)
Peak Avg
Width (mm) Speed( m/s)
LDCC Skat-60 2 X 15 90 60 420 0.87
LDCC PF-00 2 X 30 90 60 426 0.87
MDCC PF-I-500 1 X 45
2 X 30
250 200 632-640 0.65
MDCC PF-Iv-
500
1 X 45
2 X 30
300 220 632-640 0.65
MDCC MIV -
500
1 X 45
2 X 30
350 250 632-640 0.65

21. Belt Conveyor

22. Depillaring with LHD
• Average seam thickness : 4.5 m
• Gradient : 1 in 7 to 1 in 8
• Higher productivity
• Minimum labour requirement
• Limited roadway dimension

24. Support system

25. Production of different jumbo drills
• Width of heading(w) = 4.8 m
• Height of gallery(h) = 3 m
• No of faces (N) = 9
• No of blast per face per shift = 1
• Specific gravity of coal(Sg) = 1.4
Production per blast = w*h*Hd*Sg *N
Where Hd= Hole depth in m

26. Model No Hole depth (m) Production per blast (t)
BMH2831 2.795 507.12
BMH2837 3.405 617.8
BMH 2843 4.015 728.5
BMH 2849 4.625 834.6

27. LHD
• Average lead dis of LHD (d) = 60 m
• Average speed of LHD (v) = 6 KMPH
• Bucket capacity = b
• Bucket fill factor(F) = 0.8
• Loose coal density(D) = 0.9
• Amount of coal loaded per trip = b*F*D = 0.72b
• Cycle Time of LHD = 1+1+1.5 = 3.5 min
• Hourly no of trips = 17
• Hourly production of LHD = Hourly no of trips * 0.72b =
12.24 b

28. For no. of LHD,
No. of LHD = (Total production/no. of hrs per
shift * no of shift * hourly production of LHD)
= 728 / 3 *3*12.24b
= 6.67/b

29. Model No Bucket capacity (m3) No of LHD required
CT243-5577 2.4 3
CT186-9278 2.8 3
CT243-6143 3.1 2
CT243-6224 3.4 2
CT157-3662 2.4 3
Eimco Elecon 811 1.52 5
Eimco Elecon 911 3 3

30. Production of different chain
conveyors
Model No Capacity (tph)
Peak Average
Capacity in tpd
Peak average
MDCC PF-I-500 250 200 2250 1800
MDCC PF-Iv-500 300 220 2700 1980
MDCC MIV -500 350 250 3150 2250

31. Production of belt conveyor
Sandvik Belt
speed(m/
s)
Power
required(
KW)
Belt
width(mm
)
Idler
angle(deg
ree)
Capacity(t
ph)
Productio
n (tpd)
HC 500 1.25 3-7.5 800 25 100 900
HC 650 1.37 3-15 950 30 250 2250
HC 800 1.42 5.5-30 1150 30 400 3600
HC 1000 1.65 5.5-60 1350 30 700 6300
HC 1200 1.80 7.5-90 1600 30 1000 9000
HC 1400 1.25 15-90 1800 30 1300 11700
HC 1600 1.25 22-110 1900 30 1500 22500

32. ENDLESS ROPE HAULAGE
• Avg Speed of Endless haulage = 5KMPH
• Amount of coal to be handled = a
• Length of the roadway on which ERH operates
= 800 m
• Capacity of coal tub = 1 ton
• No of tubs = 800 * Amount of coal to be
handled per hour(a)/(Distance travelled by
ERH per hour * capacity of coal tub)

33. Amount of coal to be handled per hour No of tubs
Loaded Empties
200 32 32
220 36 36
250 40 40

34. DRH
• Avg Speed of Direct rope haulage = 10KMPH
• Amount of coal to be handled = a
• Length of the roadway on which ERH operates
= 500 m
• Capacity of coal tub = 1 ton
• No of tubs = 500 * Amount of coal to be
handled per hour(a)/(Distance travelled by
DRH per hour * Capacity of coal tub )

35. Amount of coal to be handled per hour No of tubs
200 10
220 11
250 13

36. Power Supply Distribution
Equipment Load in KW
MAIN VENTILATION FAN 75
Belt conveyor 180
Direct Haulage 90
Endless haulage 111
Load Haul Dumper 37
Roof bolting machine 75
Auxiliary fan 15
Face pump 7.5
Chain conveyor 2 x 45