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