Thank you everyone! Your comments are appreciated.
This is an old stamp mill, used for crushing rock/gold ore into dust and then removing the gold.
Photo-wise, it's an older image (2003) I shot with a nikon 990 in automatic mode. A curve adjustment, and a bit of dodging and burning. I like the 990 because I can hold it waist high and get very steady shots without a tripod. Always reminded me of my Mom's old tlr I used when I was a kid, but with autofocus.