Thankyou to the person who has pointed out my latest senior moment regarding the above. I called it a gold mine when it's actually a railroad station on the Colorado Central Railroad! If my smiley facility worked you can guess the one that would be here.
Anyway I have deleted the original entry (all of it) and added the Colorado Central Railroad to which I have uploaded the photo. Hopefully it's now sorted.
The past is a foreign country: they do things differently there.