Spent a lot of time up there years ago when we lived in that area. The legend of the lost gold mine and Slumachs curse, is as old as the hills. It has been said that there are clues to the mines where-abouts in some form.....but I don't think it alluded to these particular pictographs. I have a book somewhere on the legend, which is said to be based on some truth. Slumachs Gold, In Search of a Legend.