Bruneau country, as it was called a century ago, has been know for sporadic, but rich, pockets of gold. A few working mines did spring up from Rowland to Jarbridge, on both sides of the border. Most shut down within a decade when the veins pinched out. Others, including many of the mines near Jarbridge, lasted longer, but were shut down during WWII.
Based on my limited study of the area, I believe that modern exploration techniques could open up the area once again. I seem to remember that some limited drilling was done a few decades ago near Rowland, but I do not know what the results were, or who completed the work.
Too late for more coffee.