I have tried ElDorado before just scratching the surface and there is alot of gold in the area but it is deep and most of the good Geologic areas are claimed. I spend a lot of time in the area and honestly have yet to see a large 4" or anything of size working any of the claims in the area. Our club has a claim in the area on Lolo Creek and we do see decent yella stuff. Lots of places around this area to see though. Regarding Eldorado though, have a look at this document:
You can't drive very far anyware around this area without running into some mining history. And with the collection quality at the time, if they pulled a mil out, there is still alot out there. Especially when they did not clean up the bedrock too well..