Dannemora Mining Geotechnical Feasibility Study
- Client Name
- Grängesberg Exploration AB (Grangex)
- Location
- Sweden
Challenge
Grangex required feasibility level data collection, updating of the geotechnical characterisation, and subsequent confirmatory geotechnical analysis of the geotechnical underground stoping design for the restart of the Dannemora Iron Ore Mine.
Solution
SLR were selected for this project as we have sound understanding of the project ground conditions and technical aspects, world-wide experience in carrying out geotechnical data analyses programs and extensive underground mine design and operations experience. The following pieces of work were undertaken:
- Stope stability design
- Stope ground support design
- Estimate of unplanned stope dilution
- Pillar width design
- 3D numerical stress modelling
Impact
SLR conducted geotechnical analyses in support of mining the Dannemora orebodies using available site characterisation data. Using data supplied by the client and that sourced by SLR as part of this study, a geotechnical model composed of the following inputs was analysed; geological, rock mass, structural, hydrogeological, and geotechnical domains.
The analyses showed that the planned stopes are generally stable, though SLR provided recommendations for alterations to the mine design and schedule where potential stabilities issues were identified to potentially occur.
The ground support classes were tailored for the rock conditions alongside specific ground support provided for stope brows, large excavations, and intersections.
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