Nice shots, really like the HDR treatment on old rusty machinery. There's another pretty good mine tour a few miles from Argo just outside Central City/Blackhawk, it's the Hidee mine. Not so much old equipment, but very interesting from a geological perspective. The best part is the pay streak at the end of the working tunnel. It is some of the richest ore to come out of the US. Whatever chunk of it you can loosen with a hammer and chisel you can take home with you.

