Pinned straw:
Talisman Mining (with Kerry Harmanis as the major shareholder, the guy that built up Jubilee Mines and sold it to Xstrata at the peak of the nickel boom some years ago) owned the Springfield deposit alongside Sandfire's De Grussa copper/gold mine from at least 2010 - see here: Talisman Mining jumps on results from near Sandfire Resources' DeGrussa project | PerthNow [07-June-2011] - the 2010 stuff is behind a paywall. [Edit: I meant paywall, not firewall].
Springfield was the subject of a JV between Sandfire (SFR) and Talisman (TLM) that allowed SFR to explore for copper and gold across the tenement for which they earned 30% of the project. After Monty was found, Sandfire bought the other 70% of the tenement off Talisman for $72.3 million. George Sakalidis claims to have been part of the team involved in acquiring tenements leading to the Monty Copper discovery, however I can't find any evidence of Sakalidis ever working for Talisman. In any case, he may have, or he may have worked for a company that were granted the tenements and then sold them to Talisman prior to 2010, or he could have worked for a company that lodged applications for tenements on behalf of miners such as Talisman, and in any of those scenarios he could claim to have been involved in acquiring those tenements, but he had nothing to do with the Monty discovery, as that was done many years later by Sandfire - in late 2015 and in 2016 - see here: Talisman Gets Results At Monty - ShareCafe [22-Jan-2016].
In terms of the Blackman deposit, that's coming up blank in terms of Google searches. And Ramelius don't mention it as being part of any of their current assets in their "Projects" list, however a search of their entire website turns up one reference to Blackmans, not Blackman, and it's under "Mount Magnet Gold Exploration Project", then under "Geology and Mineralisation", then in the eighth paragraph, last line, it says, "The eastern margin of the Mistico Formation is bound by the Lennonville Fault, a north-south trending fault/shear zone that controls the distribution of a number of small gold deposits along its strike within the northern half of Ramelius’ land package, ultimately heading northwards towards the Blackmans deposit and further north towards the township of Cue."
So, yeah, they appear to own it, but they're not very interested in it. In terms of mines, the only one that comes close is in NSW - see here: Blackmans Mine (Blackfellows Mine; Breakfast Creek Mine; Breakfast Reef), Wisemans Creek, Westmoreland Co., New South Wales, Australia (mindat.org) and that ain't it, as it's in NSW and RMS' mines are all in WA and they (RMS) do mention the Blackman deposit near Cue, which is in WA, but it has never been mined, so it's not very significant.
Don't know if that helps @edgescape It seems to me that George Sakalidis has been in or around the industry for a few decades, but has never done anything particularly noteworthy during that time, so in terms of backing management who have a good track record, I can't find one for Mr. Sakalidis.