The impression I had was that Ardiden kept Pickle Lake Gold...

The impression I had was that Ardiden kept Pickle Lake Gold project and put tenements prospective for LCT pegmatites into GT1. GT1 then had 80% mineral rights in relation to those tenements but they were acquired / pegged for their lithium prospectivity not their gold or other metal prospectivity. They later bought the remaining 20% to have 100%.

LCT pegmatites are however Lithium, Caesium, Tantalum pegmatites. Perhaps in a game of copy WR1/PMT, some LCT pegmatites have Caesium or Tantalum mineralisation. WR1 has recently put out Caesium ASX releases. PMT has recently put out ASX releases about Tantalum and Caesium.

There are also several instances in Australia where Gold and Lithium have been located in very close proximity (Mt Holland, Mt Ida). Given the mafic rocks need drilling and blasting my understanding is they are not the preferred host rock for a lower cost gold project. With gold prices where they are, you don't need to be the lowest cost gold producer in town, having good grade mineralisation is enough.

From TG6's prospectus - If you take tenements like Wisa, it was being explored by a gold company



There are links between Seymour and Tantalum in GT1's prospectus


And McCombe has some tantalum readings


GT1's prospectus only had Caesium references relating to LCT commentary but that is another possibility from the review.

Overall your typical simplification of pegmatite mineralisation diagram lists 5 rare-metal elements and this work may be looking for the other 4.