The PGE's at Julimar are actually hosted in a variety of...

The PGE's at Julimar are actually hosted in a variety of minerals, including tin, telluride and bismuth alloys. This is potentially caused by post-intrusion hydrothermal fluids, or due to the contaminated magma required to cause sulphur saturation (ie; assimilated felsic crust supplies felsic associated chalcophile trace elements, which find their way into the sulphides, and then partition with palladium into bizarre species).

However, generally the first blush of sulphides in an intrusion tend to strip the vast majority of PGE's out of the melt, because of the high partition coefficient of platinoids within sulphur; this can form PGE rich reefs such as the UG1 within interstitial sulphides in oxide mineral cumulates. Several PGE enriched reefs exist within magnetite cumulates, always the first magnetite-out cumulate in the intrusion. Thereafter, PGE contents in intrusions fall to crustal abundance or lower.

So if pyrrhotite is the first sulphide out of the melt, with some chalcopyrite (Cu behaves less strongly in the way platinoids do), then you will form a pyrrhotite-dominant, low-Cu, low-Ni high PGE massive or disseminated sulphide zone. This is Julimar.

I strongly advise a look over at Podium for other permutations of PGE rich intrusions before writing off pyrrhotitic sulphides. That said, we all can't get a gram of rhodium.