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From Face to Surface
A fragmentation study
Professor Håkan Schunnesson
www.gruvochmetallutvinning.se
www.siostrim.se
From Face to Surface is a joint project between Luleå
University of Technology, LKAB and Boliden Mineral AB
The project have two test sites/case studies; Boliden’s Aitik mine and LKAB’s Malmberget mine
Project team (LTU);
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Håkan Schunnesson, project leader
Daniel Johansson, senior researcher
Anna Gustafson, senior researcher
Jenny Greberg, senior researcher
Ali Beyglou, PhD student, Aitik
Kristoffer Berglund, PhD student , LKAB Malmberget
Project aim:
• Increase productivity
• Decrease disturbances
• Decrease energy consumption
By Optimize fragmentation
Fragmentation has a significant impact on all mine production systems
Fragmentation has a significant impact on all mine production systems
Boulder
1m
Fragmentation has a significant impact on all mine production systems
Fine fractions
Hadjigeorgiou 2005
Fragmentation has a significant impact on all mine production systems
What is the best fragmentation for mine production?
Fragmentation has a significant impact on all mine production systems
What is the best fragmentation for mineral processing?
OK, but how can we know that we improved or optimized fragmentation and the effects of fragmentation?
Measure absolute fragmentation
• Image analysis has been done, but is difficult and debated.
• Varying external conditions (light, snow, etc.).
• Do not answer the questions how it influence production and how shall it be optimized. Use indicators related to the production effects of fragmentation –
Performance Indicators
KPI’s
Some initial results
Some results: optimize blasting
Adjust initiation direction and blast pattern to domains of rock mass structure Lislerud, A. 1990
Geological Structures by Photogrammetry
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Construct a 3D surface from 2 stereoscopic images
Scale and Geo-Reference
Identify structures
Find domains statistically
Domains and initial tests
Beyglou et al. 2015
Some possible indicators
• Swell factor
• Bucket weight
• Buckets per truck
Buckets per truck
Some results
Blast 3
Blast 4
Blast 2
Blast 5
Blast 1
Blast 6
Potential gain:
3‐4% more weight/bucket
13‐14% less bucket/truck
Swell factor
Bucket weight
Blast 6
Blast 5
Blast 3
Blast 4
Blast 2
Bucket weight
Blast 1
Face‐to‐Surface:
• Results from first field test will be presented at Fragblast 2015
• Field tests continues for bench 255, 270, 285 in the same area
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• More results, also from tests in the Malmberget mine, shortly on www.facetosurface.se
Thank you