I found these 2 bits of information.
One came from Janice O'Neils records regarding the Pioneer Club.
Which show's the Gold Spike Group taking over. See writing on top of record.

The 2nd one has to do with Jackie's involvement in the Sundance. It never said he owned it, just managed it

The Sundance Hotel opened in 1980 on land owned by Moe Dalitz. Dalitz, an organized crime figure tied to the Chicago Outfit, faced difficulty from the Gaming Commission, so the casino was nominally run by his associates, Al Sachs and Herb Tobman, who also owned the Stardust and Fremont
In 1983, Sachs and Tobman faced suspension of their gaming licenses due to charges of skimming. Dalitz applied to manage the Sundance himself, but the Gaming Commission stalled on his application, until July 1984, when he agreed to surrender management to Jackie Gaughan until the casino could be sold. Finally, in 1987, the Sundance was sold to Lincoln Management Group (later Fitzgeralds Gaming) and renamed as Fitzgeralds Las Vegas.

If anyone can verify any of this further please let me know