You have some Native American members (more or less) but that area he's talkin about is populated by Rez Dogs and they don't really care for you at all, Frankn. Or me, or anybody else, comin in on their land. However, if you can play politics, and the info you have is good, go directly to the tribal government and make friends, on the side. You might swing permission, because greed is prevalent in politics regardless of the culture. I don't know the Shoshones, but I have a lot of southern Arapaho friends. But they don't go up north too much. Good luck, and hope you find it.