A study confirms the oldest red ocher mine in North and South America is in Southeastern Wyoming

Wyoming Public Radio | By Kamila Kudelska
Published May 27, 2022 at 4:17 PM MDT

Archeological excavations led by Wyoming's state archaeologist and University of Wyoming researchers have confirmed that an ancient mine in Southeastern Wyoming was used nearly 13,000 years ago to collect red ocher. This discovery means that the Powars II site is the oldest documented red ocher mine and the oldest mine in North and South America. Wyoming Public Radio's Kamila Kudelska spoke with Wyoming State Archaeologist Spencer Pelton on the discovery.

Spencer Pelton: We didn't yet know if there were intact deposits left at the site. We suspected there were…that these artifacts were all coming from this kind of mat of iron ore and hematite that we could see kind of perched up on a hill. But nobody had yet excavated that deposit. And so my goal going into this site was to document whether or not there were intact deposits. And if there were, to get a really good understanding of how that archaeological site formed, how old it was, and what kind of activities were going on there…really specifically to confirm that people were actually coring hematite at the site. And it wasn't just this weird accumulation of artifacts, but it was actually a…basically a red paint mine.

Kamila Kudelska: And so what did you find out?

SP: We were able to find out a lot more than I thought we would. We were able to confirm that, yeah, it is a hematite quarry. And beyond that, we got a lot of good bone to radiocarbon date, and we were able to show that it's the oldest hematite quarry in the Western Hemisphere. On top of that, we were able to establish, kind of, different phases of use of the site from the earliest stages where people were pioneering this quarry, leaving behind a stickman of quarry tailings. And then we're able to actually see what people came back hundreds of years later, and had to excavate through the quarry tailings of the pioneers of the site, basically, to get down to that mineral again, and they reuse the site again later. So we were able to get a really nuanced, pretty nuanced understanding of how the site was used over a period of 1,000 to 1,500 years, between more or less, like 13,000 and 11,500 years ago or so.

KK: So you're saying this is the oldest known red ocher mine in the Western Hemisphere, is that right?

SP: Yeah, it is. And there's only five of these things at this point that have been identified. The other ones are in Yucatan, one in Peru and one in Chile. That's it. They're super rare archaeological sites. Anytime you've been playing in a creek and you pick up a red rock, you call it a paint rock and you can kind of draw on yourself or whatever. That's technically hematite. But hematite like this, which is basically mined out of an iron ore deposit, forms out of an iron ore deposit, is really rare. If you think about mining in this country, iron deposits, really rich iron deposits, are just not all that common and this hematite is forming in that. So it's a pretty uncommon thing in general, and then finding evidence for people mining it almost 13,000 years ago, is unprecedented, basically.

KK: So what's the significance of finding this?

SP: I think the broader significance is that red paint seems to have held a pretty important role in the lives of Paleoindians on the Plains and the Rocky Mountains. We've found it in basically every context that exists in the archaeological record at that time - burials and caches, animal kills, on the floors of houses. There's been a lot of ideas thrown around about why people were so drawn to this stuff or what they were using it for. Some of the more functional explanations were that it was used to treat hide. Hematite seems to have some sort of antiseptic properties that would have made hide working with it a good thing. People have suggested it has been used in sunscreen; you can spread it on yourself to keep the sun off. But then there's also a lot less practical applications of it. I mean, among modern Native Americans, it's used for a host of ritual purposes and symbolic purposes, used to draw rock art. Basically, just used in every part of life among Paleoindians, at least it seems. So I think the broader context of the site is that we find this, we find this red ochre, hematite sites, all throughout the Plains, from North Dakota, down in Colorado, Texas, and then all the way west into the Rocky Mountains. I strongly suspect that a lot of that hematite came from this site, the Powars II site. This was a place where people were coming from a really long distance, or at least trading for this stuff over a really long distance, for the first several thousand years of human prehistory in North America.

More:
https://www.wyomingpublicmedia.org/open-spaces/2022-05-27/a-study-confirms-the-oldest-red-ocher-mine-in-north-and-south-america-is-in-southeastern-wyoming