The Castle Dome turquoise mine is located about 30 miles from the Sleeping Beauty mine, near Globe, Arizona. The Castle Dome mine has not been in operation since the early 1970s. The turquoise deposit had been depleted. Castle Dome was operated as an open pit mine. The site has since been reclaimed, meaning it has been filled in and replanted with native plants and grasses.
Castle Dome is known for its incredible bright blue color. Castle Dome is distinguished from Sleeping Beauty by its more vibrant blue and the presence of more matrix. The matrix in Castle Dome turquoise is light brown to gold in color. This stone is unique because of the honey brown crust that is present before it is cut. Most of the remaining Castle Dome turquoise has been stabilized and cut into beads. The natural stone is extremely rare and hard.