Nice stuff. There is a school out by my neck of the woods built in a similar fashion. I'd go take pictures of it but rumor has it there's a guy living in there who's a little on the unhinged side. I think a lot of the schools built out West in that era were based all on the same basic pattern.
Talking of my interpretation of these pictographs and petroglyphs, I thought I was the geek but the rumors where I'm from says that the americans had multiple language families in 1492 something Indo-European speaker never had. This collection you documented just reconfirms it for me.
That looks some kind of wagon to me. Or maybe a trailer. Probably used to haul the stuff came from the mining site.
That trail reminds me of our first trail trip with our '88 Wrangler YJ. Hoping to finish its restoration and install the Smittybilt SRC roof rack thing coming month.