"All of this wood was some kind of structure that they built aboveground, obviously. For what purpose I don’t know. But it runs up and down the slope for quite a distance. It’s got to be some kind of mineral separation technique that uses gravity. Maybe they sluiced water down through it, or something. In some places, it’s just these big chutes." Zula pointed to the wreckage of one such in the background of a photograph of Uncle Richard. Then she shuffled papers around until she found a photo of something that looked like a very old house pushed askew by a shock wave. "Other places you’ll see a platform with a shack, or even something the size of this, built on it. But they are mostly just flattened, as you can see."