1.
The Jameson Range intrusion as part of the Mantamaru Intrusion mainly comprises leucocratic olivine-bearing, Fe-Ti oxide-rich cumulates with several magnetite layers.
2.
The upper part of the Jameson Range intrusion hosts several P-rich layers reaching at least 59 m in thickness.
3.
The basal magnetite layer in the Jameson Range is markedly enriched in PGE with up to 2 ppm Pt + Pd + Au and 0.3 wt% Cu representing a Stella-type PGE reef with further potential for significant Ti-V mineralisation. Average TiO2 and V2O5 concentrations in the basal magnetite layer are 24 and 1.05 wt%, respectively.
4.
Sulphide saturation was likely reached in response to extensive fractionation and magnetite crystallisation resulting in high tenor PGE mineralisation at R factors between 10,000 and 100,000.
5.
The intersected magnetitites provide evidence for the injection of crystal slurries into unconsolidated cumulates. The principle sorting process within these slurries is not so much controlled by the grain size-dependent “Brazil-nut effect” but rather by mineral densities and their sorting velocities, although the grain size also affects the sorting process.
6.
Several lines of evidence suggest that faulting duplicated the igneous succession, which would account for the unusual stratigraphic thickness of up to 10 km.
7. The discovery of P-rich layers in the Jameson Range significantly contributes to the mineral potential of the Musgrave Province. Further exploration will result in a better definition of the PGE-Au-V-Ti-P mineralisation potential associated with the Jameson Range intrusion. The development of the Nebo-Babel deposit close-by might establish an infrastructure providing favourable conditions for exploration in the near future
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