Diamond Mill Mine
Located in a spur of Ole Hamilton Hill in southern Barlow County. Primarily a source of copper, with some silver. The name was designed to attract investment. No diamonds or other precious gems were ever found there, though at present thundereggs and geodes can be dug out of the rhyolitic tuff above the mine proper.
Diamond Mill is one of a number of defunct mines in southern Barlow County. It is approximately eight miles from Kimble's Hole Mine.