Mystery post

I like to explore on foot wherever we park our trailer, and even in remote areas I usually come across evidence of human activity. I found this upright post on an isolated rocky slope about a mile west of the Red Rock Canyon campground near Las Vegas.

The post didn’t appear to commemorate a grave; the pile of rocks at the base seemed intended only to support the post. It bore no identification words or numbers, such as you’d expect to see on a government survey marker. And if this was a mining claim, the cairn had no supporting document tucked inside some container, like other mining claims I had found.

I saw no similar posts in the area, nor any other signs of human presence.

Any ideas?