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WIRTGEN SURFACE MINING TECHNOLOGY AND CHALLENGES IN COAL IN MONGOLIA

Ulan Batar, 21st February, 2014

Applications for Surface Miners

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The following jobs are not longer required:

Cut, crush, load in one operation with one machine

Surface Miner application

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Mining without blasting

Environmentally friendly:No dust generationNo noise or air overpressureNo ground vibrations

Better exploitation :Mining up to thetenement boundary

Improved safety:No explosives No fly rocks

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

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Smooth truck loading

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Grain size distribution - coal

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Gradation in coal

PartingCoalPartingCoalParting

Highly-selective miningHorizontal seams

CoalPartingCoalParting

Highly-selective miningHorizontal seams

PartingCoalParting

Highly-selective miningHorizontal seams

CoalParting

Highly-selective miningHorizontal seams

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Highly-selective mining

High quality ROM-products (ROM = Run Of Mine)Reduced processing cost (less washing, less crushing)Reduced waste material handlingBetter exploitation of depositBetter stripping ratio

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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

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Selective mining of steep seams

Opportunities in Coal in Mongolia

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Multiple seam depositsHigh-quality coal (mainly coking coal)Long transportation distances to customersWashing

- 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

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High ROM quality coal (selective mining)Reduced or no washingNo crushingNo drilling and blasting

Benefits of Wirtgen Surface Miners

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Coal seam structure Erdenes Tavan Tolgoi (ETT)

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Coal seam structure Energy Resources (Ukhaa Khudag)

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Coal seam structure - Baganuur #2

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Coal seam structure - Baganuur #2

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Coal seam structure

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Considerations for evaluation

Conventional mining method

WirtgenSurface 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

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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/kgCoal seam 3A-1 1,2 t/bcum 0,5 m 14,47 % 3412 kcal/kgParting 1,8 t/bcum 0,2 m 100 % 0 kcal/kgCoal 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/kgParting 1,8 t/bcum 0,1 m 100 % 0 kcal/kgCoal seam 3B-2 1,2 t/bcum 0,9 m 14,47 % 3412 kcal/kgParting 1,8 t/bcum 0,25 m 100 % 0 kcal/kgCoal seam 3B-3 1,2 t/bcum 0,9 m 14,47 % 3412 kcal/kgInterburden 1,8 t/bcum 25,67 m 100 % 0 kcal/kgCoal seam 2-1 1,2 t/bcum 0,4 m 16,88 % 3379 kcal/kgParting 1,8 t/bcum 0.4 m 100 % 0 kcal/kgCoal seam 2-2 1,2 t/bcum 0,7 m 16,88 % 3379 kcal/kgParting 1,8 t/bcum 0,2 m 100 % 0 kcal/kgCoal seam 2-3 1,2 t/bcum 0,75 m 16,88 % 3379 kcal/kgParting 1,8 t/bcum 0,9 m 100 % 0 kcal/kgCoal seam 2-4 1,2 t/bcum 0,7 m 16,88 % 3379 kcal/kgInterburden 1,8 t/bcum 29,65 m 100 % 0 kcal/kgCoal seam 1-1 1,2 t/bcum 2,69 m 15,74 % 3518 kcal/kgParting 1,8 t/bcum 0,5 m 100 % 0 kcal/kgCoal seam 1-2 1,2 t/bcum 8,55 m 15,74 % 3518 kcal/kgParting 1,8 t/bcum 0,55 m 100 % 0 kcal/kgCoal seam 1-3 1,2 t/bcum 8,9 m 15,74 % 3518 kcal/kgParting 1,8 t/bcum 3,13 m 100 % 0 kcal/kgCoal seam 1-4 1,2 t/bcum 0,6 m 15,74 % 3518 kcal/kgParting 1,8 t/bcum 0,3 m 100 % 0 kcal/kg

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Comparison conventional mining vs. Surface Mining - Borehole 283

Overburden/Partings Coal Extracted

coal

Averageheatingvalue

Average ash

content

Strip-ping ratio

Annual coal

production

AnnualOB-handling

OB handlingsaving by SM

SurfaceMiner

129,05 bcum/m2

35,2 t/m2 98 % 3393

kcal/kg17,17

% 3,7 3.500.000 t/year

12.833.134 bcum/year

1.803.880bcum/year

Conven-tional

132,93 bcum/m2

31,79 t/m2 78% 2986

kcal/kg24,41

% 4,2 3.500.000 t/year

14.637,014 bcum/year

Thank you for your kind attention !

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