The Mayflower Mill is one of the last fully intact mills in the Silverton, Colorado area. Also known as the Shenandoah-Dives Mill, it was the most advanced flotation mill for its time.
It has a long working history, opened in the 1920s, it survived the Great Depression and WWII, finally closing in 1991. And although it is not remote, it is a very interesting site.
These grainy photos are from 2005.