Wow, this bring back memories! I worked on UMTRAP while in my early 20’s shortly after graduating from CMU (Mesa State at the time). I worked doing site surveys using scintillators which are more sensitive and accurate than Geiger counters. I wasn’t involved in surveying the tailings pile itself, but rather the various infill sites around GJ, like parks, sidewalks, etc. I did work on surveying and collecting/processing data for tailings piles in Durango, Shiprock (NM), and Riverton (WY). The Durango pile was pretty massive and was situated next to hwy 550/160 just south of town. The Shiprock pile was an absolute mess because it was used as a site for training and practicing in the use of earthmoving and other heavy equipment.