Mindoona, part of the South Jimblebar Iron Ore Hub, is situated 40 km east of the town of Newman. The deposit is located on a faulted east-west striking ridge abutting the granite-greenstone outcrop of the Sylvania Inlier along the Painkiller Bore Fault. The north-dipping strata are partially buried by Cenozoic detritals up to 200 m thick.
PSM was engaged to model Cenozoic detritals into geotechnically significant sub-units following from the precedent study undertaken at Mining Area C.
Variability in the rock mass strength required defining the sub-units and determining whether sub-divisions were co-relatable at the drill-hole spacing of 50 m.
Most drill-holes were drilled within the ore-body zone, with less available for characterisation of the final wall area. Undertaking a comparative study between assay results and new technology Hylogger geochemical assessment.
Following rigorous assessment and modelling, PSM’s tailored approach included:
The project significantly increased geotechnical understanding of the hanging wall materials and provides an excellent basis for future analytical studies, stability analyses and slope design.
PSM and BHP Billiton Iron Ore expanded their collaboration into geotechnical differentiation of Cenozoic detritals and introduced the concept to additional Pilbara sites. This represented the first geotechnical modelling of detrital for the Mindoona site and the first where data from the new Hylogger method of geochemical analysis was used.
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