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Public Power Cooperation of Greece
Chrys Steiakakis, MSc
Chrys SteiakakisMineral Resources Engineer, MSc
Civil Engineer, MSc, ASCEGeosysta Ltd
Best practices for geotechnical planning and design in open pit mining operations:
A sustainability approach
Zach Agioutantis, PhDProfessor of Rock Mechanics , TUCResearch Professor, Virginia Tech
Virginia TechTechnical University of Crete
Geosysta LtdScientific and consulting services
P. Schilizzi, PhD, E. Papakosta, A. Tsalidis, G. PagonisMining Engineers
Public Power Cooperation of Greece (∆ΕΗ)
SDIMI 2013 6th International Conference on Sustainable Development in the Minerals
Industry
30 June ‐
3 July 2013, Milos island, Greece
SDIMI 2013
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Presentation outline:
Geotechnical Importance in Sustainable Mining
Geotechnical Best Practices in Open Pit Mining
Case Study of a lignite open pit mine in Greece
Conclusions
Chrys Steiakakis, MSc SDIMI 2013
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Sustainable Mining:
Cost effective mining
Minimize Environmental Impact
Produce added social and economic value
How Geotechnical involvement affects sustainability?
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Striping Ratio:
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Striping Ratio:
Too LOW
can produce slope failuresBingham Canyon Mine,
2013
known as the Kennecott
Copper Mine
Kennecott slide moved more than 165M tons of dirt (by
Associated Press)
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Striping Ratio:
Slope failures can result in loss of lifeTibet Gold Mine, 2013
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Striping Ratio:
Slope failures can result in operation disruption
Yallourn
Coal mine, Victoria
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Striping Ratio:
Slope failures can result in Company loss of Credibility
Round Mountain gold mine, Nevada
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Striping Ratio:
Too HIGH
can produce uneconomical operation
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Environmental and sociological impact
Mine tailings failures
Hungary Ajka alumina sludge spill 4
October 2010
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Importance in Sustainable Mining
Why do such events occur?
Due to poor initial design?
Due to poor design implementation?
Due to climatic (weather) conditions?
Due to other events (i.e. seismic, poor blasting)?
Due to combination of factors?
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Can such occurrence be prevented?
Appropriate GEOTECHNICAL involvement in all mine stages
“Best practice”
approach:
Starting during Reserve Investigation
During Feasibility Study
During Mine Planning
During Mine Production
During Mine Closure
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Reserve Investigation:
Involve as early as possible an Engineering Geologist
When drilling for reserves….
…use the opportunity for
geotechnical data collection,
and sampling
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Feasibility Study:
Execute preliminary geotechnical testing of all materials
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Feasibility Study:
Record geological ‐
geotechnical information in consistent way
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Feasibility Study:
Install monitoring instruments in selected boreholes
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Mine Planning:
Detail evaluation of geological –
geotechnical model
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Mine Planning:
Detail slope stability analysis and slope design
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Mine Planning:
Deterministic slope stability calculations (FS)
Probabilistic slope stability calculations (FS)
Limit equilibrium analysis Best estimate of parameters
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Mine Planning:
Execute risk hazard analysisImplement risk management procedures
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Mine Planning:
Design monitoring program
Evaluate and design contingency plans
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Chrys Steiakakis, MSc SDIMI 2013
Geotechnical Best Practices in Open Pit Mining
Mine Operation:
Frequent re‐evaluation of geological –
geotechnical model
Routine monitoring of slopes
Store and analyze monitoring data (real time database?)
Implement warning and alarm limits
Implement contingency plan
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Chrys Steiakakis, MSc SDIMI 2013
Case Study of a lignite open pit mine in Greece
Mavropigi Mine Ptolemaida PPC:Excavation depth ~150mMine operation from 2002328 bank Mm3
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Chrys Steiakakis, MSc SDIMI 2013
Case Study of a lignite open pit mine in Greece
Mavropigi Mine Ptolemaida PPC:Slope monitoring locations
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Chrys Steiakakis, MSc SDIMI 2013
Mavropigi Mine Ptolemaida PPC:
Case Study of a lignite open pit mine in Greece
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Chrys Steiakakis, MSc SDIMI 2013
Mavropigi Mine Ptolemaida PPC:
Case Study of a lignite open pit mine in Greece
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Chrys Steiakakis, MSc SDIMI 2013
Mavropigi Mine Ptolemaida PPC:
Case Study of a lignite open pit mine in Greece
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Chrys Steiakakis, MSc SDIMI 2013
Mavropigi Mine Ptolemaida PPC:
Case Study of a lignite open pit mine in Greece
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Chrys Steiakakis, MSc SDIMI 2013
Mavropigi Mine Ptolemaida PPC:
Case Study of a lignite open pit mine in Greece
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Chrys Steiakakis, MSc SDIMI 2013
Conclusions
Geotechnical best practices are tightly linked with the sustainability of mining operations (surface or
underground)
An example was presented for best practices with respect to geotechnical planning and design
Yes, there are success stories
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Chrys Steiakakis, MSc SDIMI 2013
Bingham Canyon Copper Mine
Thank you!
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