I'm from that area- you are thinking of the 'mine' or placer gold producing area that is actually on or very near the Minam River, which is now in a 'wilderness' protection area. In the old days we could ride motorcycles up the river trail to Red's Horse Ranch which is a private holding now in the surrounding wilderness area. There have been folks who have searched that area for the placer gold but have come up empty handed. I suspect it is not actually on the Minam river, but on one of the creeks or gulches that empty into the river. There was/still is a hardrock mine on LeGore peak in the Eagle Cap wilderness area, which is just up Hurricane creek from Joseph, Oregon. I have been to that mine, but it is a hardrock mine, not placer. Perhaps there was some old float placer from that general area that ended up in LeGore Lake, or even down in Hurrican creek. There is also a mine on the face of Chief Joseph mountain, which is just behind my old home about 3 miles out of the town of Joseph. I have been to that mine, it is a hardrock mine that produced gold, silver and copper. Have found many nice samples of raw native copper from that mine, but never heard of anyone finding any placer gold in the general area. There is nice small placer gold in the Imnaha river area up river from the town of Imnaha near the NFS campgrounds of Ollicot and Blackhorse and a couple of other NFS campgrounds. The gold is placer and found by panning only, no dredging allowed, too bad 'cause I could dredge up some nice gold. It is thought that the gold found in the river is glacier gold that has been brought down from the headwaters of the Imnaha river. When Hell's Canyon dam was being put in the Snake river years ago, the divers who checked and cleaned the bedrock and placed the explosives for the dam footings were finding nice placer nuggets in the cracks of the river bedrock- know this first hand from someone who helped build the dam! So where did that gold wash down from? I have explored and panned some of the side creeks that feed into the Snake just above the dam on the Oregon side, but have not spent enough time and effort to really check out any potential sources. The old timers always told me that we needed about another 500-1000 years of geological time to expose the gold deposits in that area.