Picture of the underside would be useful. Is there a fire ring? What does that look like? Cast iron can often be identified by the handle design, too, that one looks vaguely like the Red Mountain that I have ... but not quite. And the sides look a bit too tall for what I've seen.
Have you seen those guys who identify places around the globe with only a split second view of somewhere on google maps? Where there’s a will, there’s a way.
Do I have that way? No, but the internet be crazy good at identifying shit.