The document discusses the use of surface miners for coal mining in Mongolia. Surface miners allow for highly selective mining of coal seams and partings with thicknesses as low as 10 cm, improving coal quality and reducing waste. They offer environmental, safety, and operational advantages over conventional mining methods like no dust, noise, vibrations or need for explosives. Surface miners could benefit Mongolia's coal mining by enabling selective mining of complex seam structures to produce higher quality coal with less processing and waste. This may improve mining economics by reducing costs.

1. 1
WIRTGEN SURFACE MINING
TECHNOLOGY AND CHALLENGES
IN COAL IN MONGOLIA
Ulan Batar, 21st February, 2014

2. Applications for Surface Miners
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3. The following jobs are not longer required:
Cut, crush, load in one operation with one machine
Surface Miner application
3

4. 4
Mining without blasting
Environmentally friendly:
No dust generation
No noise or air overpressure
No ground vibrations
Better exploitation :
Mining up to the
tenement boundary
Improved safety:
No explosives
No fly rocks

5. Advantages:
 Small particles in constant flow do not harm truck bodies
 No tire and chassis damages since trucks travel on even and solid ground
5
Smooth truck loading

6. 6
Grain size distribution - coal

7. 7
Gradation in coal

8. Parting
Coal
Parting
Coal
Parting
Highly-selective mining
Horizontal seams

9. Coal
Parting
Coal
Parting
Highly-selective mining
Horizontal seams

10. Parting
Coal
Parting
Highly-selective mining
Horizontal seams

11. Coal
Parting
Highly-selective mining
Horizontal seams

12. 12
Highly-selective mining
 High quality ROM-products (ROM = Run Of Mine)
 Reduced processing cost (less washing, less crushing)
 Reduced waste material handling
 Better exploitation of deposit
 Better stripping ratio

13. 13
Loss and dilution
Interburden
dilution
Mixing area along cutting line
Real cutting line
Amplitude
area
Real loss- and dilution zone
Continuous loss- and dilution zone (33 % of amplitude)
Additional loss- and dilution through mixing along the
cutting line (15 – 20 % of amplitude)
Coal
Interburden
Coal loss

14. 14
Selective mining of steep seams

15. Opportunities in Coal in Mongolia
15

16. 16
Multiple seam deposits
High-quality coal (mainly coking coal)
Long transportation distances to customers
Washing
- Improves coal quality (higher sales value)
- Reduces transportation costs
Washing requires water
- Limited water volume available in mining area
- Long transport distances for water
Situation in coal mines in Mongolia

17. 17
High ROM quality coal (selective mining)
Reduced or no washing
No crushing
No drilling and blasting
Benefits of Wirtgen Surface Miners

18. 18
Coal seam structure
Erdenes Tavan Tolgoi (ETT)

19. 19
Coal seam structure
Energy Resources (Ukhaa Khudag)

20. 20
Coal seam structure - Baganuur #2

21. 21
Coal seam structure - Baganuur #2

22. 22
Coal seam structure

23. 23
Considerations for evaluation
Conventional mining
method
Wirtgen
Surface Miners
Minimum seam thickness
for selective recovery
coal and parting
2,0 m 0,1 m
Selectivity
- Top of seam:
Loss (coal) and adding
(parting)
0,3 m 0,02 m
- Bottom of seam:
Loss (coal) and adding
(parting)
0,1 m 0,02 m

24. 24
Deposit structure - loss and dilution
Borehole 283
Seam Density
Average
thickness
Average ash
content
Average heating
value
Overburden / Interburden 1,8 t/bcum 55,3 m 100 % 0 kcal/kg
Coal seam 3A-1 1,2 t/bcum 0,5 m 14,47 % 3412 kcal/kg
Parting 1,8 t/bcum 0,2 m 100 % 0 kcal/kg
Coal seam 3A-2 1,2 t/bcum 0,5 m 14,47 % 3412 kcal/kg
Parting / Interburden 1,8 t/bcum
1,29 m +
10,91m=12,2m
100 % 0 kcal/kg
Coal seam 3B-1I 1,2 t/bcum 2,98 m 14,47 % 3412 kcal/kg
Parting 1,8 t/bcum 0,1 m 100 % 0 kcal/kg
Coal seam 3B-2 1,2 t/bcum 0,9 m 14,47 % 3412 kcal/kg
Parting 1,8 t/bcum 0,25 m 100 % 0 kcal/kg
Coal seam 3B-3 1,2 t/bcum 0,9 m 14,47 % 3412 kcal/kg
Interburden 1,8 t/bcum 25,67 m 100 % 0 kcal/kg
Coal seam 2-1 1,2 t/bcum 0,4 m 16,88 % 3379 kcal/kg
Parting 1,8 t/bcum 0.4 m 100 % 0 kcal/kg
Coal seam 2-2 1,2 t/bcum 0,7 m 16,88 % 3379 kcal/kg
Parting 1,8 t/bcum 0,2 m 100 % 0 kcal/kg
Coal seam 2-3 1,2 t/bcum 0,75 m 16,88 % 3379 kcal/kg
Parting 1,8 t/bcum 0,9 m 100 % 0 kcal/kg
Coal seam 2-4 1,2 t/bcum 0,7 m 16,88 % 3379 kcal/kg
Interburden 1,8 t/bcum 29,65 m 100 % 0 kcal/kg
Coal seam 1-1 1,2 t/bcum 2,69 m 15,74 % 3518 kcal/kg
Parting 1,8 t/bcum 0,5 m 100 % 0 kcal/kg
Coal seam 1-2 1,2 t/bcum 8,55 m 15,74 % 3518 kcal/kg
Parting 1,8 t/bcum 0,55 m 100 % 0 kcal/kg
Coal seam 1-3 1,2 t/bcum 8,9 m 15,74 % 3518 kcal/kg
Parting 1,8 t/bcum 3,13 m 100 % 0 kcal/kg
Coal seam 1-4 1,2 t/bcum 0,6 m 15,74 % 3518 kcal/kg
Parting 1,8 t/bcum 0,3 m 100 % 0 kcal/kg

25. 25
Comparison conventional mining vs.
Surface Mining - Borehole 283
Overburden/
Partings
Coal
Extracted
coal
Average
heating
value
Average
ash
content
Strip-
ping
ratio
Annual
coal
production
Annual
OB-handling
OB handling
saving by SM
Surface
Miner
129,05
bcum/m2
35,2
t/m2 98 %
3393
kcal/kg
17,17
%
3,7
3.500.000
t/year
12.833.134
bcum/year
1.803.880
bcum/year
Conven-
tional
132,93
bcum/m2
31,79
t/m2 78%
2986
kcal/kg
24,41
%
4,2
3.500.000
t/year
14.637,014
bcum/year

26. Thank you
for your kind
attention !
With our customers around the world
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