The Bushveld intrusion contains 75% of the world's resources of Pt, 52% of Pd, 82% of Rh and 16% of Ni Economic concentrations of these metals occur principally in three stratigraphic units, the UG-2 chromitite, the Merensky Reef (MR) and the Platreef.
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Naldrett et al. (2009) studied this question.
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