RE: Silver mineralisation in weathered ultramafic unit in first drill hole at Elizabeth Hill – Great sta18 Aug 2021 23:14
@HH, not sure this helps but according to wikipedia for Platinum Group under occurrence:-
Generally, ultramafic and mafic igneous rocks have relatively high, and granites low, PGE trace content. Geochemically anomalous traces occur predominantly in chromian spinels and sulfides. Mafic and ultramafic igneous rocks host practically all primary PGM ore of the world. Mafic layered intrusions, including the Bushveld Complex, outweigh by far all other geological settings of platinum deposits.
Other economically significant PGE deposits include mafic intrusions related to flood basalts, and ultramafic complexes of the Alaska, Urals type.
https://en.wikipedia.org/wiki/Platinum_group