You may be interested to review a University of Montana master's thesis and accompanying maps/plates entitled: "The geology and tectonic history of the Fourth of July Creek area, White Cloud Peaks, Custer County, Idaho", by Robert M Sengebush, 1984. The non color map (Plate 1) is pretty hard to read in the U of M's ScholarWorks PDF format, but it appears Sengebush has a thrust fault contact between two Paleozoic units, one including clastic rocks and gray limestones of Mississippian age (Salmon River sequence), running pretty much through Phyllis Lake and up the mountainside to the south. To the north of the lake, he's got the White Cloud Stock in contact with the Salmon River sequence. The fault is itself folded by subsequent compressional tectonic activity. If you look closely at the Ivory Peak picture, it looks like some folded bedding surfaces are truncated within the light buff rocks and the longer distance "evening view" picture shows a sharply differing lithology on the right which may be the "Pole Creek Formation" of Pennsylvanian-Permian age. My armchair guess is that the truncated bedding surfaces within the first picture are from minor intraformational faults within the Salmon River sequence and that the sharper lithologic change in the latter picture shows the thrust fault separating Salmon River sequence from Pole Creek Formation. Sengebush's work makes no mention of mineralization such as Elmer's mine, but his map shows the White Cloud Stock, a granitic intrusion of Cretaceous age, butting up against Phyllis Lake from the east, and a significant portion of metallic mineral deposits throughout the Rockies are found where these Cretaceous intrusives came into contact with older sedimentary rocks, particularly limestones. The Ivory Peak picture shows a series of veins cutting across bedding and not folded in the fashion that the bedding is folded, therefore younger than the folding. The veins are truncated to the right along one of the intraformational faults, perhaps indicative of continued brittle faulting following emplacement of the White Cloud Stock, from which the veins likely originated.
There is one heck of a lot going on in those two photos, Mr. Ski, whether my guesses are correct or not!
